{"id":43462,"date":"2023-09-29T09:07:44","date_gmt":"2023-09-29T07:07:44","guid":{"rendered":"https:\/\/panelsandwich.org\/02-materies-primes\/"},"modified":"2026-09-24T08:38:39","modified_gmt":"2026-09-24T06:38:39","slug":"02-materies-primes","status":"publish","type":"page","link":"https:\/\/panelsandwich.org\/ca\/informacio-tecnica-de-panells-sandvitx\/02-materies-primes\/","title":{"rendered":"02 &#8211; Mat\u00e8ries Primes"},"content":{"rendered":"<div class=\"product\"><div class=\"product\">\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"43462\" class=\"elementor elementor-43462 elementor-33487\" data-elementor-post-type=\"page\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-b64d21f elementor-section-height-default elementor-section-boxed elementor-section-height-default\" data-id=\"b64d21f\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-3e417fd\" data-id=\"3e417fd\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-8605a6a elementor-widget elementor-widget-text-editor\" data-id=\"8605a6a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t\n<div class=\"hero\">\n  <div>\n    <p class=\"kicker\">INFORMACI\u00d3 T\u00c8CNICA \u00b7 MAT\u00c8RIES PRIMES<\/p>\n    <h1>Materials del panell sandvitx: cares met\u00e0l\u00b7liques i nuclis a\u00efllants<\/h1>\n    <p class=\"lead\">Un panell sandvitx combina dues cares r\u00edgides separades per un nucli lleuger. Les cares aporten protecci\u00f3, geometria i capacitat de treball conjunt; el nucli transmet esfor\u00e7os de tall, mant\u00e9 separades les cares i aporta gran part de l&#8217;a\u00efllament t\u00e8rmic. <\/p>\n    <p class=\"sub\">Aquesta guia conserva la informaci\u00f3 t\u00e8cnica hist\u00f2rica disponible a PanelSandwich.org, per\u00f2 separa expressament els valors de refer\u00e8ncia antics de les prestacions que han de verificar-se avui a la fitxa t\u00e8cnica i la documentaci\u00f3 del producte concret.<\/p>\n    <div class=\"actions\">\n      <a class=\"a1\" href=\"#caras-metalicas\">Cares met\u00e0l\u00b7liques \u2193<\/a>\n      <a class=\"a2\" href=\"#nucleos-aislantes\">Nuclis a\u00efllants \u2193<\/a>\n    <\/div>\n  <\/div>\n  <div class=\"photo\"><img decoding=\"async\" src=\"https:\/\/panelsandwich.org\/wp-content\/uploads\/2024\/05\/panel-lana-roca.jpg\" alt=\"Panells sandvitx amb nucli de llana de roca\" title=\"\"><\/div>\n<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-4cb0e02 elementor-section-height-default elementor-section-boxed elementor-section-height-default\" data-id=\"4cb0e02\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-ed3c215\" data-id=\"ed3c215\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-c956b6a elementor-widget elementor-widget-text-editor\" data-id=\"c956b6a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t\n<div class=\"navgrid\">\n<a href=\"#caras-metalicas\">Cares met\u00e0l\u00b7liques<\/a>\n<a href=\"#aluminio\">Alumini<\/a>\n<a href=\"#acero-inox-cobre\">Inoxidable i coure<\/a>\n<a href=\"#pur-pir\">PUR \/ PIR<\/a>\n<a href=\"#fenolica\">Escuma fen\u00f2lica<\/a>\n<a href=\"#espumas-propiedades\">Propietats d&#8217;escumes<\/a>\n<a href=\"#lana-mineral\">Llana mineral<\/a>\n<a href=\"#propiedades-lana\">Propietats de la llana<\/a>\n<a href=\"#comparativa\">Comparativa<\/a>\n<a href=\"#documentacion-actual\">Qu\u00e8 verificar avui<\/a>\n<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-a1e19cb elementor-section-height-default elementor-section-boxed elementor-section-height-default\" data-id=\"a1e19cb\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-474bd70\" data-id=\"474bd70\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-471aa40 elementor-widget elementor-widget-heading\" data-id=\"471aa40\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Per qu\u00e8 les mat\u00e8ries primes defineixen el panell<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8a21114 elementor-widget elementor-widget-text-editor\" data-id=\"8a21114\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p style=\"max-width:980px;margin:0;\">El desenvolupament dels panells sandvitx respon a la recerca de tancaments lleugers amb a\u00efllament elevat i muntatge r\u00e0pid. Les escumes r\u00edgides PUR\/PIR van permetre reduir pes i gruix enfront de solucions tradicionals, i la incorporaci\u00f3 posterior de llana mineral va ampliar les opcions per a foc i ac\u00fastica. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4d66c9b elementor-widget elementor-widget-text-editor\" data-id=\"4d66c9b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t\n<div class=\"cards\">\n  <div class=\"card\"><div class=\"eyebrow\">Estructura<\/div><h3>Dues cares r\u00edgides<\/h3><p>Les superf\u00edcies exteriors es fabriquen amb materials de m\u00f2dul relativament alt i es mantenen separades pel nucli.<\/p><\/div>\n  <div class=\"card\"><div class=\"eyebrow\">Mec\u00e0nica<\/div><h3>Nucli lleuger<\/h3><p>El nucli aporta rigidesa al conjunt i suporta una part important dels esfor\u00e7os de tall entre les cares.<\/p><\/div>\n  <div class=\"card\"><div class=\"eyebrow\">Prestaci\u00f3<\/div><h3>A\u00efllament integrat<\/h3><p>El nucli funciona simult\u00e0niament com a material a\u00efllant, permetent obtenir tancaments lleugers i de muntatge r\u00e0pid.<\/p><\/div>\n<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-ac27e34 elementor-section-height-default elementor-section-boxed elementor-section-height-default\" data-id=\"ac27e34\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-3ddf26f\" data-id=\"3ddf26f\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-7555ee3 elementor-widget elementor-widget-heading\" data-id=\"7555ee3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Cares met\u00e0l\u00b7liques: requisits i materials<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b7269b2 elementor-widget elementor-widget-text-editor\" data-id=\"b7269b2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t\n<p>Les cares met\u00e0l\u00b7liques exteriors es descriuen a la documentaci\u00f3 hist\u00f2rica com a fulles relativament fines i d&#8217;alta resist\u00e8ncia. Han de poder <strong>perfilar-se i plegar-se durant la fabricaci\u00f3<\/strong> i, un cop incorporades al panell, respondre a necessitats diferents segons l&#8217;aplicaci\u00f3. <\/p>\n<ul>\n<li>Resist\u00e8ncia a les accions de vent.<\/li>\n<li>Impermeabilitat enfront d&#8217;aigua i vapor quan el sistema ho requereixi.<\/li>\n<li>Contribuci\u00f3 a la resist\u00e8ncia del panell i enfront de c\u00e0rregues locals.<\/li>\n<li>Compatibilitat amb processos de perfilat, plegat i producci\u00f3 cont\u00ednua.<\/li>\n<li>Resist\u00e8ncia adequada a la corrosi\u00f3 i comportament enfront del foc segons el sistema.<\/li>\n<\/ul>\n<p>El contingut original cita com a metalls utilitzats <strong>acer galvanitzat, alumini, acer inoxidable i coure<\/strong>. Les xapes se subministren habitualment en bobina, cosa que permet incorporar-les a processos continus de conformat. <\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2572ed8 elementor-widget elementor-widget-text-editor\" data-id=\"2572ed8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t\n<div class=\"wrap\"><table>\n<thead><tr><th>Material de cara<\/th><th>Per qu\u00e8 s&#8217;utilitza<\/th><th>Aspectes del contingut t\u00e8cnic original<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>Acer galvanitzat<\/td><td>Soluci\u00f3 met\u00e0l\u00b7lica habitual per capacitat de conformat, resist\u00e8ncia i economia.<\/td><td>Pot utilitzar-se pintat o sense pintar; el recobriment i la protecci\u00f3 enfront de corrosi\u00f3 s&#8217;especifiquen segons el producte.<\/td><\/tr>\n<tr><td>Alumini<\/td><td>Baix pes i bona resist\u00e8ncia a la corrosi\u00f3 en determinades aplicacions.<\/td><td>El contingut hist\u00f2ric cita aliatges 3003\u20133103 i gruixos habituals de 0,7\u20131,2 mm a les aplicacions que descriu.<\/td><\/tr>\n<tr><td>Acer inoxidable<\/td><td>Ambients interiors agressius o amb requisits higi\u00e8nics elevats.<\/td><td>La seva resist\u00e8ncia a la corrosi\u00f3 es relaciona amb el contingut de crom i pot reduir necessitats de manteniment.<\/td><\/tr>\n<tr><td>Coure<\/td><td>Acabats d&#8217;elevada durabilitat i formaci\u00f3 natural de p\u00e0tina superficial.<\/td><td>El contingut original relaciona l&#8217;evoluci\u00f3 de la p\u00e0tina amb l&#8217;ambient mar\u00ed, urb\u00e0 o rural.<\/td><\/tr>\n<\/tbody><\/table><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-e94a898 elementor-section-height-default elementor-section-boxed elementor-section-height-default\" data-id=\"e94a898\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-03de76e\" data-id=\"03de76e\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-5982bb9 elementor-widget elementor-widget-heading\" data-id=\"5982bb9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Alumini en panell sandvitx<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b275d72 elementor-widget elementor-widget-text-editor\" data-id=\"b275d72\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t\n<h3>Alumini: aplicacions i gruixos hist\u00f2rics<\/h3>\n<p>La p\u00e0gina original destaca l&#8217;\u00fas d&#8217;alumini quan existeixen requisits especials de resist\u00e8ncia a la corrosi\u00f3 o higiene, per exemple en determinats entorns de producci\u00f3 o emmagatzematge d&#8217;aliments.<\/p>\n<p>Com a refer\u00e8ncia hist\u00f2rica, el text cita aliatges de la s\u00e8rie <strong>3003\u20133103<\/strong> i un interval habitual de gruix de <strong>0,7 a 1,2 mm<\/strong>. Tamb\u00e9 indica que 0,7 mm es considerava sovint un m\u00ednim pr\u00e0ctic per limitar danys locals per manipulaci\u00f3 o trepitjades, encara que podien utilitzar-se 0,6 mm en determinats casos. <\/p>\n<div class=\"note\"><strong>Important:<\/strong> aquests gruixos procedeixen del contingut t\u00e8cnic hist\u00f2ric de la p\u00e0gina i no han d&#8217;utilitzar-se com a prescripci\u00f3 universal. L&#8217;aliatge i gruix de la cara han de comprovar-se a la fitxa del panell actual. <\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-2cdc60a elementor-section-height-default elementor-section-boxed elementor-section-height-default\" data-id=\"2cdc60a\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-11571ff\" data-id=\"11571ff\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-7af71d9 elementor-widget elementor-widget-heading\" data-id=\"7af71d9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Acer inoxidable, coure i adhesi\u00f3 al nucli<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-84160bc elementor-widget elementor-widget-text-editor\" data-id=\"84160bc\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t\n<h3>Acer inoxidable<\/h3>\n<p>El contingut original el vincula amb aplicacions d&#8217;elevada exig\u00e8ncia higi\u00e8nica o amb ambients interiors agressius. La resist\u00e8ncia a la corrosi\u00f3 de l&#8217;inoxidable s&#8217;associa al contingut de crom i a la formaci\u00f3 d&#8217;una capa passiva protectora. <\/p>\n<h3>Coure i formaci\u00f3 de p\u00e0tina<\/h3>\n<p>El coure es presenta com a alternativa de baix manteniment. La seva superf\u00edcie evoluciona per oxidaci\u00f3 fins a formar una p\u00e0tina protectora i el color original s&#8217;enfosqueix progressivament. <\/p>\n<p>La documentaci\u00f3 hist\u00f2rica aporta aquests terminis orientatius d&#8217;oxidaci\u00f3 plena:<\/p>\n<ul>\n<li><strong>4\u20136 anys:<\/strong> ambients marins.<\/li>\n<li><strong>8\u201315 anys:<\/strong> ambients urbans.<\/li>\n<li><strong>20\u201350 anys:<\/strong> ambients rurals.<\/li>\n<\/ul>\n<p>S\u00f3n refer\u00e8ncies hist\u00f2riques i depenen de les condicions ambientals reals.<\/p>\n<h3>Adhesi\u00f3 al nucli i backcoat<\/h3>\n<p>Per afavorir l&#8217;adhesi\u00f3 entre la cara met\u00e0l\u00b7lica i el nucli, el costat interior pot rebre una emprimaci\u00f3 espec\u00edfica. El contingut original cita una capa interior denominada <strong>backcoat<\/strong> amb un gruix de refer\u00e8ncia de <strong>5 \u00b5m<\/strong>. <\/p>\n<div class=\"note\">El valor de 5 \u00b5m es conserva perqu\u00e8 forma part de la informaci\u00f3 t\u00e8cnica existent, per\u00f2 el sistema d&#8217;emprimaci\u00f3 i el seu gruix han de verificar-se amb el prove\u00efdor de la bobina i el fabricant actual del panell.<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-3f262fc elementor-section-height-default elementor-section-boxed elementor-section-height-default\" data-id=\"3f262fc\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-58b8b1c\" data-id=\"58b8b1c\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-82dbaf5 elementor-widget elementor-widget-heading\" data-id=\"82dbaf5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Nuclis d'escuma r\u00edgida<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-42ba884 elementor-widget elementor-widget-text-editor\" data-id=\"42ba884\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p style=\"max-width:970px;margin:0;\">La documentaci\u00f3 t\u00e8cnica original considera com a escumes r\u00edgides principals el PUR\/PIR i l&#8217;escuma fen\u00f2lica. Es descriuen com a materials termoestables amb una estructura majorit\u00e0riament de c\u00e8l\u00b7lules tancades. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1bdd911 elementor-widget elementor-widget-text-editor\" data-id=\"1bdd911\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t\n<div class=\"split\">\n  <div class=\"box\"><h3>PUR \/ PIR<\/h3><p>Escumes r\u00edgides termoestables de c\u00e8l\u00b7lules majorit\u00e0riament tancades. El contingut original situa aproximadament el 90 % de l&#8217;estructura com a c\u00e8l\u00b7lula tancada. <\/p><ul><li>Elevat a\u00efllament t\u00e8rmic<\/li><li>Baixa in\u00e8rcia t\u00e8rmica<\/li><li>Producci\u00f3 mitjan\u00e7ant reacci\u00f3 qu\u00edmica i expansi\u00f3<\/li><\/ul><\/div>\n  <div class=\"box\"><h3>Escuma fen\u00f2lica (PF)<\/h3><p>Material termoestable descrit hist\u00f2ricament per la seva baixa conductivitat i bon comportament enfront de la ignici\u00f3 i el fum, per\u00f2 amb major fragilitat mec\u00e0nica.<\/p><ul><li>Normalment produ\u00efda en lloses<\/li><li>Uni\u00f3 posterior a les cares mitjan\u00e7ant adhesiu<\/li><li>Major cura enfront de c\u00e0rregues repetides<\/li><\/ul><\/div>\n<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-f81f075 elementor-section-height-default elementor-section-boxed elementor-section-height-default\" data-id=\"f81f075\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-4ef1620\" data-id=\"4ef1620\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-ade61fc elementor-widget elementor-widget-heading\" data-id=\"ade61fc\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">PUR i PIR: composici\u00f3, reacci\u00f3 i estructura cel\u00b7lular<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-608c652 elementor-widget elementor-widget-text-editor\" data-id=\"608c652\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t\n<h3>Components principals<\/h3>\n<p>La formulaci\u00f3 descrita per a PUR\/PIR parteix de quatre grups principals:<\/p>\n<ul>\n<li><strong>Poliol.<\/strong><\/li>\n<li><strong>Isocianat.<\/strong><\/li>\n<li><strong>Agent d&#8217;expansi\u00f3.<\/strong><\/li>\n<li><strong>Activador o catalitzador<\/strong> per controlar la reacci\u00f3.<\/li>\n<\/ul>\n<h3>Agents d&#8217;expansi\u00f3<\/h3>\n<p>La documentaci\u00f3 hist\u00f2rica recorda l&#8217;abandonament dels CFC pel seu impacte sobre la capa d&#8217;oz\u00f3 i cita com a alternatives utilitzades posteriorment diverses formes de <strong>pent\u00e0<\/strong> i sistemes basats en <strong>aigua<\/strong>, la reacci\u00f3 de la qual amb l&#8217;isocianat genera CO\u2082.<\/p>\n<p>Tamb\u00e9 esmenta la possibilitat d&#8217;incorporar retardants de flama en determinades formulacions, advertint que el seu efecte i les emissions de fum han d&#8217;avaluar-se sobre la formulaci\u00f3 i producte assajat.<\/p>\n<h3>Reacci\u00f3, expansi\u00f3 i refredament<\/h3>\n<p>Un cop barrejats els components, el l\u00edquid comen\u00e7a a escumar i expandir-se r\u00e0pidament. El document original cita un interval aproximat de <strong>3\u20136 minuts<\/strong> entre barreja i enduriment, depenent del gruix i del proc\u00e9s. <\/p>\n<p>La reacci\u00f3 \u00e9s exot\u00e8rmica. Per a panells de m\u00e9s de 100 mm, el text hist\u00f2ric indica que el nucli podia superar localment <strong>150 \u00b0C<\/strong> durant la reacci\u00f3 i recomanava un per\u00edode m\u00ednim de <strong>24 hores<\/strong> abans de l&#8217;enviament per completar enduriment i refredament. <\/p>\n<div class=\"note\">Aquests temps i temperatures descriuen processos hist\u00f2rics concrets i no han de convertir-se en par\u00e0metres de producci\u00f3 universals. Els par\u00e0metres reals depenen de formulaci\u00f3, l\u00ednia, gruix i fabricant. <\/div>\n<h3>Difer\u00e8ncia qu\u00edmica hist\u00f2rica entre PUR i PIR<\/h3>\n<p>El contingut original explica la difer\u00e8ncia mitjan\u00e7ant una major proporci\u00f3 d&#8217;isocianat en PIR i cita, com a exemple hist\u00f2ric, relacions aproximades poliol:isocianat de <strong>100:100 per a PUR<\/strong> i <strong>100:150 per a PIR<\/strong>.<\/p>\n<p>Tamb\u00e9 relaciona el PIR amb major estabilitat t\u00e8rmica i formaci\u00f3 d&#8217;una capa carbonitzada m\u00e9s estable en escalfar-se. Com a refer\u00e8ncies del text original, es citen processos de degradaci\u00f3 per sobre d&#8217;aproximadament <strong>250 \u00b0C per a PUR<\/strong> i <strong>350 \u00b0C per a PIR<\/strong>, i una temperatura de proc\u00e9s del PIR de l&#8217;ordre de <strong>40\u201345 \u00b0C<\/strong>. <\/p>\n<div class=\"note\"><strong>Lectura correcta:<\/strong> aquestes temperatures no s\u00f3n classificacions al foc ni temperatures de servei del panell. S\u00f3n refer\u00e8ncies hist\u00f2riques del comportament de l&#8217;escuma i del proc\u00e9s descrit. La reacci\u00f3 al foc d&#8217;un panell actual s&#8217;obt\u00e9 de la seva classificaci\u00f3 i documentaci\u00f3 vigent.  <\/div>\n<h3>Estructura cel\u00b7lular<\/h3>\n<p>L&#8217;escuma endurida es descriu com una xarxa de c\u00e8l\u00b7lules tancades separades per membranes fines. Les c\u00e8l\u00b7lules contenen agent d&#8217;expansi\u00f3 i gasos de reacci\u00f3; la composici\u00f3 interna pot evolucionar per difusi\u00f3 amb el temps, cosa que influeix en les propietats t\u00e8rmiques. <\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-9027f09 elementor-section-height-default elementor-section-boxed elementor-section-height-default\" data-id=\"9027f09\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-babfc2a\" data-id=\"babfc2a\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-59fc8d0 elementor-widget elementor-widget-heading\" data-id=\"59fc8d0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Classificacions hist\u00f2riques de les escumes PUR<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c26a33d elementor-widget elementor-widget-text-editor\" data-id=\"c26a33d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t\n<h3>Classificacions B2\/B3 i M2: conservar com a context hist\u00f2ric, no com a criteri actual<\/h3>\n<p>La p\u00e0gina original descriu la classificaci\u00f3 alemanya <strong>DIN 4102-1<\/strong>, on determinades escumes PUR s&#8217;identificaven com a B2 o B3, i cita tamb\u00e9 la classificaci\u00f3 francesa M2 vinculada a antics procediments d&#8217;aprovaci\u00f3.<\/p>\n<p>Aquesta terminologia es mant\u00e9 aqu\u00ed perqu\u00e8 forma part del contingut t\u00e8cnic hist\u00f2ric i ajuda a interpretar documentaci\u00f3 antiga, per\u00f2 <strong>no ha d&#8217;utilitzar-se per substituir la classificaci\u00f3 europea vigent del producte acabat<\/strong>.<\/p>\n<div class=\"current\"><strong>Per a especificaci\u00f3 actual:<\/strong> ha de consultar-se la classificaci\u00f3 de reacci\u00f3 al foc del panell complet i la documentaci\u00f3 associada al producte. No \u00e9s correcte deduir l&#8217;Euroclasse del panell \u00fanicament a partir d&#8217;una denominaci\u00f3 hist\u00f2rica de l&#8217;escuma. <\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-ec185d6 elementor-section-height-default elementor-section-boxed elementor-section-height-default\" data-id=\"ec185d6\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-3f276e0\" data-id=\"3f276e0\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-205781e elementor-widget elementor-widget-heading\" data-id=\"205781e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Escuma fen\u00f2lica (PF)<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-daa3bac elementor-widget elementor-widget-text-editor\" data-id=\"daa3bac\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t\n<p>L&#8217;escuma r\u00edgida fen\u00f2lica es va incorporar hist\u00f2ricament a panells compostos per la seva combinaci\u00f3 de baixa conductivitat t\u00e8rmica i bon comportament enfront del foc.<\/p>\n<p>El text original li atribueix:<\/p>\n<ul>\n<li>Elevada resist\u00e8ncia a l&#8217;encesa.<\/li>\n<li>Velocitat de combusti\u00f3 redu\u00efda enfront d&#8217;altres escumes descrites.<\/li>\n<li>Baixos \u00edndexs d&#8217;emissi\u00f3 de fum a les formulacions de refer\u00e8ncia.<\/li>\n<\/ul>\n<p>Es descriu la seva producci\u00f3 a partir d&#8217;una resina fen\u00f2lica\/formaldehid, un agent d&#8217;expansi\u00f3 vol\u00e0til i un agent d&#8217;enduriment. L&#8217;escuma es fabricava preferentment en lloses, que posteriorment es tallaven i adherien a les cares met\u00e0l\u00b7liques. <\/p>\n<p>La documentaci\u00f3 tamb\u00e9 assenyala dues limitacions hist\u00f2riques: pres\u00e8ncia d&#8217;aigua \u00e0cida residual, que dificultava la laminaci\u00f3 cont\u00ednua, i una major <strong>friabilitat<\/strong>, rellevant en cobertes o plafons sotmesos a c\u00e0rregues repetides o trepitjades.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-af2d326 elementor-section-height-default elementor-section-boxed elementor-section-height-default\" data-id=\"af2d326\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-73bc24d\" data-id=\"73bc24d\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-98a28db elementor-widget elementor-widget-heading\" data-id=\"98a28db\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Propietats hist\u00f2riques de les escumes r\u00edgides<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6a73a4b elementor-widget elementor-widget-text-editor\" data-id=\"6a73a4b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t\n<p>La densitat influeix en nombroses propietats mec\u00e0niques de l&#8217;escuma i tamb\u00e9 en el cost de material. L&#8217;objectiu industrial \u00e9s obtenir les prestacions necess\u00e0ries sense incrementar innecess\u00e0riament la quantitat de material. <\/p>\n<p>El flux de calor a trav\u00e9s d&#8217;una escuma r\u00edgida de c\u00e8l\u00b7lules tancades dep\u00e8n en gran mesura dels gasos continguts a l&#8217;estructura cel\u00b7lular. Per aix\u00f2 l&#8217;agent d&#8217;expansi\u00f3, la composici\u00f3 i l&#8217;envelliment t\u00e8rmic influeixen en la conductivitat. <\/p>\n<div class=\"note\"><strong>Aquests valors s\u00f3n hist\u00f2rics i espec\u00edfics del material descrit a la p\u00e0gina original.<\/strong> Para seleccionar hoy un panel debe utilizarse la conductividad declarada, la transmitancia U del panel y el espesor del producto concreto.<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ecc6d61 elementor-widget elementor-widget-text-editor\" data-id=\"ecc6d61\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t\n<div class=\"wrap\"><table>\n<thead><tr><th>Propietat hist\u00f2rica<\/th><th>PUR B2<\/th><th>PUR B3<\/th><th>PIR<\/th><th>Interpretaci\u00f3<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>Densitat de refer\u00e8ncia<\/td><td>40 \u00b1 4 kg\/m\u00b3<\/td><td>38 \u00b1 4 kg\/m\u00b3<\/td><td>45 \u00b1 5 kg\/m\u00b3<\/td><td>Valors citats per a productes d&#8217;un fabricant hist\u00f2ric; no representen tots els panells actuals.<\/td><\/tr>\n<tr><td>Conductivitat PUR despr\u00e9s de fabricaci\u00f3<\/td><td colspan=\"3\">0,020\u20130,024 W\/m\u00b7K<\/td><td>Refer\u00e8ncia hist\u00f2rica per a l&#8217;escuma PUR descrita.<\/td><\/tr>\n<tr><td>Conductivitat PUR a llarg termini<\/td><td colspan=\"3\">0,024\u20130,030 W\/m\u00b7K<\/td><td>El text relaciona el canvi amb l&#8217;evoluci\u00f3 dels gasos a l&#8217;estructura cel\u00b7lular.<\/td><\/tr>\n<\/tbody>\n<\/table><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-1a86a8d elementor-section-height-default elementor-section-boxed elementor-section-height-default\" data-id=\"1a86a8d\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-2231066\" data-id=\"2231066\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-decf019 elementor-widget elementor-widget-heading\" data-id=\"decf019\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Llana mineral: estructura, llana de vidre i llana de roca<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ed78e98 elementor-widget elementor-widget-text-editor\" data-id=\"ed78e98\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t\n<h3>Llana de vidre<\/h3>\n<p>La p\u00e0gina original descriu la fabricaci\u00f3 de lloses de llana de vidre a partir d&#8217;una fusi\u00f3 de <strong>sorra de quars, carbonat de sodi i cal\u00e7<\/strong>, o a partir de vidre reciclat. Tamb\u00e9 cita el m\u00e8tode TEL, en el qual la massa fosa es transforma en fibres mitjan\u00e7ant petites obertures i acci\u00f3 d&#8217;aire. <\/p>\n<p>El contingut hist\u00f2ric indica que la llana de vidre pot contenir una proporci\u00f3 d&#8217;agent lligant de l&#8217;ordre del <strong>4\u201315 %<\/strong>, i que densitat i gruix poden modificar-se variant par\u00e0metres de proc\u00e9s com la velocitat de la cinta.<\/p>\n<h3>Estructura ortotr\u00f2pica<\/h3>\n<p>Les lloses de llana mineral presenten una estructura fortament direccional. Les fibres llargues tendeixen a alinear-se amb el proc\u00e9s de fabricaci\u00f3, mentre que les fibres curtes adopten orientacions m\u00e9s aleat\u00f2ries. Aquesta anisotropia explica que les propietats mec\u00e0niques canvi\u00efn segons la direcci\u00f3 de c\u00e0rrega.  <\/p>\n<p>Els lligants contribueixen de forma important a la rigidesa i resist\u00e8ncia del producte acabat.<\/p>\n<h3>Llana de roca, humitat i temperatura<\/h3>\n<p>El text original atribueix a la llana mineral d&#8217;origen roc\u00f3s una elevada resist\u00e8ncia a temperatures altes i una bona resposta enfront de la humitat respecte a la llana de vidre considerada a la mateixa font.<\/p>\n<p>En ser un material fibr\u00f3s sense estructura de c\u00e8l\u00b7lules tancades, la difusi\u00f3 de vapor i la pres\u00e8ncia d&#8217;aigua han de tractar-se de forma diferent a una escuma r\u00edgida. La font indica que l&#8217;absorci\u00f3 pot reduir-se mitjan\u00e7ant additius hidr\u00f2fugs. <\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-da92c40 elementor-section-height-default elementor-section-boxed elementor-section-height-default\" data-id=\"da92c40\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-b37bfe0\" data-id=\"b37bfe0\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-d786343 elementor-widget elementor-widget-heading\" data-id=\"d786343\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Propietats hist\u00f2riques de la llana mineral<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-30591d3 elementor-widget elementor-widget-text-editor\" data-id=\"30591d3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t\n<p>La font original indica que aproximadament el <strong>75 % del flux t\u00e8rmic<\/strong> a la llana mineral analitzada es relacionava amb fen\u00f2mens convectius i conductius lligats a l&#8217;aire contingut a la seva estructura.<\/p>\n<p>Tamb\u00e9 assenyala que, amb baix contingut de lligant org\u00e0nic, les fibres minerals presenten molt baixa combustibilitat; tanmateix, la classificaci\u00f3 de reacci\u00f3 al foc d&#8217;un producte actual ha d&#8217;obtenir-se de la documentaci\u00f3 del panell complet.<\/p>\n<div class=\"note\">No ha de deduir-se una Euroclasse a partir de la temperatura de fusi\u00f3 de la fibra ni de la seva composici\u00f3. El panell acabat inclou cares, adhesius, lligants, junta i altres components. <\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3c2c3f2 elementor-widget elementor-widget-text-editor\" data-id=\"3c2c3f2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t\n<div class=\"wrap\"><table>\n<thead><tr><th>Propietat hist\u00f2rica de llana mineral<\/th><th>Interval \/ valor citat<\/th><th>Observaci\u00f3<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>Densitat usada en panells<\/td><td>90\u2013145 kg\/m\u00b3<\/td><td>Interval general citat per la font hist\u00f2rica.<\/td><\/tr>\n<tr><td>Compressi\u00f3 perpendicular a fibres<\/td><td>0,005\u20130,08 N\/mm\u00b2<\/td><td>La resist\u00e8ncia dep\u00e8n fortament d&#8217;estructura i densitat.<\/td><\/tr>\n<tr><td>Tracci\u00f3 perpendicular a fibres<\/td><td>0,001\u20130,01 N\/mm\u00b2<\/td><td>Menor que la resist\u00e8ncia paral\u00b7lela a l&#8217;orientaci\u00f3 principal.<\/td><\/tr>\n<tr><td>Resist\u00e8ncia a tall<\/td><td>0,03\u20130,20 N\/mm\u00b2<\/td><td>Valor hist\u00f2ric de refer\u00e8ncia.<\/td><\/tr>\n<tr><td>M\u00f2dul de tall<\/td><td>2\u201320 N\/mm\u00b2<\/td><td>Dep\u00e8n d&#8217;orientaci\u00f3 i estructura interna.<\/td><\/tr>\n<tr><td>Tracci\u00f3 paral\u00b7lela<\/td><td>0,03\u20131,0 N\/mm\u00b2<\/td><td>Amb m\u00f2dul d&#8217;elasticitat citat de 5\u201340 N\/mm\u00b2.<\/td><\/tr>\n<tr><td>Compressi\u00f3 paral\u00b7lela<\/td><td>0,10\u20130,15 N\/mm\u00b2<\/td><td>Amb m\u00f2dul d&#8217;elasticitat citat de 6\u201320 N\/mm\u00b2.<\/td><\/tr>\n<tr><td>Absorci\u00f3 d&#8217;aigua en panell compost<\/td><td>0,2\u20130,5 %<\/td><td>Refer\u00e8ncia hist\u00f2rica per a condicions normals i producte protegit per les cares.<\/td><\/tr>\n<tr><td>Conductivitat t\u00e8rmica de llosa<\/td><td>0,033\u20130,034 W\/m\u00b7K<\/td><td>Font hist\u00f2rica per a densitats aproximades de 60\u2013150 kg\/m\u00b3.<\/td><\/tr>\n<tr><td>Temperatura de fusi\u00f3 de fibra de vidre<\/td><td>\u2248650 \u00b0C<\/td><td>No equival a una classificaci\u00f3 al foc del panell.<\/td><\/tr>\n<tr><td>Temperatura de fusi\u00f3 de fibra de roca<\/td><td>\u22481000 \u00b0C<\/td><td>No equival a una classificaci\u00f3 al foc del panell.<\/td><\/tr>\n<\/tbody>\n<\/table><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-6249e60 elementor-section-height-default elementor-section-boxed elementor-section-height-default\" data-id=\"6249e60\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-cf46d5f\" data-id=\"cf46d5f\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-4289494 elementor-widget elementor-widget-heading\" data-id=\"4289494\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Comparativa t\u00e8cnica de nuclis a\u00efllants<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-743d455 elementor-widget elementor-widget-text-editor\" data-id=\"743d455\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p style=\"max-width:980px;margin:0;\">La comparaci\u00f3 ha de fer-se per prestaci\u00f3 del panell acabat, no per una \u00fanica propietat del material base.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-971bd22 elementor-widget elementor-widget-text-editor\" data-id=\"971bd22\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t\n<div class=\"wrap\"><table>\n<thead><tr><th>Fam\u00edlia<\/th><th>Estructura<\/th><th>Fortalesa principal<\/th><th>Qu\u00e8 comprovar en projecte<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>PUR<\/td><td>Escuma r\u00edgida de c\u00e8l\u00b7lules tancades<\/td><td>Molt bon a\u00efllament t\u00e8rmic amb pes redu\u00eft<\/td><td>Conductivitat declarada, densitat, reacci\u00f3 al foc, gruix i U del panell<\/td><\/tr>\n<tr><td>PIR<\/td><td>Escuma r\u00edgida amb major \u00edndex d&#8217;isocianat<\/td><td>A\u00efllament t\u00e8rmic i millor estabilitat t\u00e8rmica que formulacions PUR equivalents<\/td><td>Prestacions declarades del panell; no extrapolar les de l&#8217;escuma<\/td><\/tr>\n<tr><td>PF<\/td><td>Escuma fen\u00f2lica termoestable<\/td><td>Hist\u00f2ricament destacada per baixa conductivitat i foc<\/td><td>Disponibilitat actual, fragilitat, classificaci\u00f3 i sistema complet<\/td><\/tr>\n<tr><td>Llana de roca<\/td><td>Fibres minerals amb lligants<\/td><td>Prestacions enfront del foc i ac\u00fastica en sistemes espec\u00edfics<\/td><td>Densitat, orientaci\u00f3, absorci\u00f3, U, ac\u00fastica i classificaci\u00f3 del panell<\/td><\/tr>\n<tr><td>Llana de vidre<\/td><td>Fibres de vidre amb lligants<\/td><td>A\u00efllament t\u00e8rmic i ac\u00fastic en sistemes compatibles<\/td><td>Contingut de lligant, densitat, humitat i classificaci\u00f3 del sistema<\/td><\/tr>\n<\/tbody><\/table><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-520eb14 elementor-section-height-default elementor-section-boxed elementor-section-height-default\" data-id=\"520eb14\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-c984a6a\" data-id=\"c984a6a\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-1a1f433 elementor-widget elementor-widget-heading\" data-id=\"1a1f433\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Quina documentaci\u00f3 i propietats has de comprovar avui<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0298746 elementor-widget elementor-widget-text-editor\" data-id=\"0298746\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t\n<p>La informaci\u00f3 t\u00e8cnica hist\u00f2rica \u00e9s \u00fatil per comprendre per qu\u00e8 els materials es comporten de forma diferent, per\u00f2 l&#8217;especificaci\u00f3 d&#8217;una obra ha de recolzar-se en dades actuals del producte.<\/p>\n<div class=\"split\">\n  <div class=\"box\"><h3>Cares met\u00e0l\u00b7liques<\/h3><ul><li>Material i qualitat<\/li><li>Gruix nominal<\/li><li>Recobriment met\u00e0l\u00b7lic<\/li><li>Revestiment org\u00e0nic<\/li><li>Acabat interior i exterior<\/li><\/ul><\/div>\n  <div class=\"box\"><h3>Nucli<\/h3><ul><li>Tipus d&#8217;a\u00efllament<\/li><li>Densitat quan es declari<\/li><li>Conductivitat t\u00e8rmica<\/li><li>Transmit\u00e0ncia U del panell<\/li><li>Reacci\u00f3 al foc del producte<\/li><\/ul><\/div>\n  <div class=\"box\"><h3>Producte complet<\/h3><ul><li>Norma\/documentaci\u00f3 aplicable<\/li><li>Declaraci\u00f3 de prestacions<\/li><li>Dimensions i toler\u00e0ncies<\/li><li>Taules de c\u00e0rrega<\/li><li>Junta i fixaci\u00f3<\/li><\/ul><\/div>\n  <div class=\"box\"><h3>Projecte<\/h3><ul><li>Ambient interior i exterior<\/li><li>Corrosivitat<\/li><li>Foc i ac\u00fastica exigits<\/li><li>Humitat i temperatura<\/li><li>Compatibilitat amb remat<\/li><\/ul><\/div>\n<\/div>\n<div class=\"current\"><strong>Context normatiu actual:<\/strong> la fam\u00edlia EN 14509 cobreix panells sandvitx met\u00e0l\u00b7lics fabricats en f\u00e0brica i contempla diferents cares met\u00e0l\u00b7liques i nuclis a\u00efllants. Per a una compra o projecte concret ha de revisar-se la versi\u00f3 aplicable al mercat i la documentaci\u00f3 vigent del fabricant. <\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-4f8d649 elementor-section-height-default elementor-section-boxed elementor-section-height-default\" data-id=\"4f8d649\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-7f65c21\" data-id=\"7f65c21\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-dc49820 elementor-widget elementor-widget-heading\" data-id=\"dc49820\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Materials i acabats en producte real<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4fd60fe elementor-widget elementor-widget-text-editor\" data-id=\"4fd60fe\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t\n<div class=\"photos\">\n  <div class=\"photo-card\"><img decoding=\"async\" src=\"https:\/\/panelsandwich.org\/wp-content\/uploads\/2026\/02\/panel-fachada12.jpg\" alt=\"Cara met\u00e0l\u00b7lica de panell sandvitx de fa\u00e7ana\" title=\"\"><div class=\"copy\"><h3>Cares met\u00e0l\u00b7liques<\/h3><p>El perfil, gruix i recobriment de les cares formen part de l&#8217;especificaci\u00f3 del producte.<\/p><\/div><\/div>\n  <div class=\"photo-card\"><img decoding=\"async\" src=\"https:\/\/panelsandwich.org\/wp-content\/uploads\/2024\/05\/panel-lana-roca.jpg\" alt=\"Nucli de llana de roca en panell sandvitx\" title=\"\"><div class=\"copy\"><h3>Llana mineral<\/h3><p>L&#8217;estructura fibrosa i l&#8217;orientaci\u00f3 de les lamel\u00b7les condicionen propietats mec\u00e0niques, t\u00e8rmiques i ac\u00fastiques.<\/p><\/div><\/div>\n  <div class=\"photo-card\"><img decoding=\"async\" src=\"https:\/\/panelsandwich.org\/wp-content\/uploads\/2026\/09\/03-panel-sandwich-3-grecas-colores-ral.webp\" alt=\"Acabats de color per a xapa de panell sandvitx\" title=\"\"><div class=\"copy\"><h3>Recobriments<\/h3><p>El color \u00e9s nom\u00e9s una part del sistema: a sota existeix una combinaci\u00f3 de protecci\u00f3 met\u00e0l\u00b7lica, emprimaci\u00f3 i acabat org\u00e0nic.<\/p><\/div><\/div>\n<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-71f0d3c elementor-section-height-default elementor-section-boxed elementor-section-height-default\" data-id=\"71f0d3c\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-08e0313\" data-id=\"08e0313\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-85de09a elementor-widget elementor-widget-heading\" data-id=\"85de09a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Continua amb la guia t\u00e8cnica<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-daf10d3 elementor-widget elementor-widget-text-editor\" data-id=\"daf10d3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p style=\"margin:0;\">Les mat\u00e8ries primes expliquen el comportament base. El seg\u00fcent pas \u00e9s entendre com es transformen durant fabricaci\u00f3 i com es protegeixen les cares met\u00e0l\u00b7liques. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f205a17 elementor-widget elementor-widget-text-editor\" data-id=\"f205a17\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t\n<div class=\"related\">\n<a href=\"https:\/\/panelsandwich.org\/ca\/informacio-tecnica-de-panells-sandvitx\/03-produccio\/\">Producci\u00f3<\/a>\n<a href=\"https:\/\/panelsandwich.org\/ca\/informacio-tecnica-de-panells-sandvitx\/04-pintura\/\">Pintura i revestiments<\/a>\n<a href=\"https:\/\/panelsandwich.org\/ca\/informacio-tecnica-de-panells-sandvitx\/06-control-de-qualitat\/\">Control de qualitat<\/a>\n<a href=\"https:\/\/panelsandwich.org\/ca\/informacio-tecnica-de-panells-sandvitx\/09-proves-de-foc\/\">Comportament enfront del foc<\/a>\n<a href=\"https:\/\/panelsandwich.org\/ca\/informacio-tecnica-de-panells-sandvitx\/10-comportament-acustic\/\">Comportament ac\u00fastic<\/a>\n<a href=\"https:\/\/panelsandwich.org\/ca\/informacio-tecnica-de-panells-sandvitx\/07-emmagatzematge-i-transport\/\">Emmagatzematge i transport<\/a>\n<a href=\"https:\/\/panelsandwich.org\/ca\/panell-sandwich-llana-de-roca\/\">Panells de llana de roca<\/a>\n<a href=\"https:\/\/panelsandwich.org\/tipos-panel-sandwich\/\">Tipus de panell sandvitx<\/a>\n<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-c294c7d elementor-section-height-default elementor-section-boxed elementor-section-height-default\" data-id=\"c294c7d\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-904701c\" data-id=\"904701c\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-bdd0d73 elementor-widget elementor-widget-heading\" data-id=\"bdd0d73\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Preguntes freq\u00fcents sobre materials del panell sandvitx<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-50ede02 elementor-widget elementor-widget-accordion\" data-id=\"50ede02\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"accordion.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-accordion\">\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-8481\" class=\"elementor-tab-title\" data-tab=\"1\" role=\"button\" aria-controls=\"elementor-tab-content-8481\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-left\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<i class=\"elementor-accordion-icon-closed Array\"><\/i>\n\t\t\t\t\t\t\t\t<i class=\"elementor-accordion-icon-opened \"><\/i>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">Quins materials formen un panell sandvitx?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-8481\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"1\" role=\"region\" aria-labelledby=\"elementor-tab-title-8481\"><p>Habitualment combina dues cares r\u00edgides \u2014normalment met\u00e0l\u00b7liques\u2014 amb un nucli a\u00efllant. La fam\u00edlia de producte pot utilitzar acer, alumini, inoxidable o altres metalls i nuclis com PUR, PIR o llana mineral, segons la soluci\u00f3 concreta. <\/p>\n<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-8482\" class=\"elementor-tab-title\" data-tab=\"2\" role=\"button\" aria-controls=\"elementor-tab-content-8482\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-left\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<i class=\"elementor-accordion-icon-closed Array\"><\/i>\n\t\t\t\t\t\t\t\t<i class=\"elementor-accordion-icon-opened \"><\/i>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">PUR i PIR s\u00f3n exactament el mateix material?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-8482\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"2\" role=\"region\" aria-labelledby=\"elementor-tab-title-8482\"><p>No. S\u00f3n fam\u00edlies qu\u00edmicament relacionades, per\u00f2 el PIR utilitza una formulaci\u00f3 amb major proporci\u00f3 d&#8217;isocianat i pot presentar un comportament t\u00e8rmic i enfront del foc diferent. Ha de comparar-se el panell acabat, no nom\u00e9s l&#8217;escuma.  <\/p>\n<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-8483\" class=\"elementor-tab-title\" data-tab=\"3\" role=\"button\" aria-controls=\"elementor-tab-content-8483\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-left\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<i class=\"elementor-accordion-icon-closed Array\"><\/i>\n\t\t\t\t\t\t\t\t<i class=\"elementor-accordion-icon-opened \"><\/i>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">Els valors B2, B3 o M2 continuen sent suficients per especificar un panell?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-8483\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"3\" role=\"region\" aria-labelledby=\"elementor-tab-title-8483\"><p>S\u00f3n denominacions hist\u00f2riques \u00fatils per interpretar documentaci\u00f3 antiga. Per a un producte actual ha d&#8217;utilitzar-se la classificaci\u00f3 i documentaci\u00f3 vigent del panell complet. <\/p>\n<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-8484\" class=\"elementor-tab-title\" data-tab=\"4\" role=\"button\" aria-controls=\"elementor-tab-content-8484\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-left\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<i class=\"elementor-accordion-icon-closed Array\"><\/i>\n\t\t\t\t\t\t\t\t<i class=\"elementor-accordion-icon-opened \"><\/i>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">La llana de roca sempre t\u00e9 la mateixa densitat i conductivitat?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-8484\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"4\" role=\"region\" aria-labelledby=\"elementor-tab-title-8484\"><p>No. Els intervals hist\u00f2rics d&#8217;aquesta p\u00e0gina expliquen el comportament general, per\u00f2 cada panell utilitza una configuraci\u00f3 concreta. Han de revisar-se els valors declarats del producte.  <\/p>\n<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-8485\" class=\"elementor-tab-title\" data-tab=\"5\" role=\"button\" aria-controls=\"elementor-tab-content-8485\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-left\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<i class=\"elementor-accordion-icon-closed Array\"><\/i>\n\t\t\t\t\t\t\t\t<i class=\"elementor-accordion-icon-opened \"><\/i>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">La temperatura de fusi\u00f3 de la fibra defineix la resist\u00e8ncia al foc del panell?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-8485\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"5\" role=\"region\" aria-labelledby=\"elementor-tab-title-8485\"><p>No. La resist\u00e8ncia o reacci\u00f3 al foc es classifica sobre una configuraci\u00f3 de producte o sistema. La temperatura de fusi\u00f3 d&#8217;una fibra no substitueix aquesta classificaci\u00f3.  <\/p>\n<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-8486\" class=\"elementor-tab-title\" data-tab=\"6\" role=\"button\" aria-controls=\"elementor-tab-content-8486\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-left\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<i class=\"elementor-accordion-icon-closed Array\"><\/i>\n\t\t\t\t\t\t\t\t<i class=\"elementor-accordion-icon-opened \"><\/i>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">Per qu\u00e8 \u00e9s important el backcoat?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-8486\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"6\" role=\"region\" aria-labelledby=\"elementor-tab-title-8486\"><p>La cara interior de la bobina pot incorporar una emprimaci\u00f3 o revestiment dissenyat per afavorir compatibilitat i adhesi\u00f3 amb el nucli. El sistema concret dep\u00e8n del fabricant i proc\u00e9s. <\/p>\n<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t<\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>INFORMACI\u00d3 T\u00c8CNICA \u00b7 MAT\u00c8RIES PRIMES Materials del panell sandvitx: cares met\u00e0l\u00b7liques i nuclis a\u00efllants Un panell sandvitx combina dues cares r\u00edgides separades per un nucli lleuger. Les cares aporten protecci\u00f3, geometria i capacitat de treball conjunt; el nucli transmet esfor\u00e7os de tall, mant\u00e9 separades les cares i aporta gran part de l&#8217;a\u00efllament t\u00e8rmic. Aquesta guia [&hellip;]<\/p>\n","protected":false},"author":5963,"featured_media":0,"parent":75027,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-43462","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/panelsandwich.org\/ca\/wp-json\/wp\/v2\/pages\/43462","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/panelsandwich.org\/ca\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/panelsandwich.org\/ca\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/panelsandwich.org\/ca\/wp-json\/wp\/v2\/users\/5963"}],"replies":[{"embeddable":true,"href":"https:\/\/panelsandwich.org\/ca\/wp-json\/wp\/v2\/comments?post=43462"}],"version-history":[{"count":2,"href":"https:\/\/panelsandwich.org\/ca\/wp-json\/wp\/v2\/pages\/43462\/revisions"}],"predecessor-version":[{"id":75937,"href":"https:\/\/panelsandwich.org\/ca\/wp-json\/wp\/v2\/pages\/43462\/revisions\/75937"}],"up":[{"embeddable":true,"href":"https:\/\/panelsandwich.org\/ca\/wp-json\/wp\/v2\/pages\/75027"}],"wp:attachment":[{"href":"https:\/\/panelsandwich.org\/ca\/wp-json\/wp\/v2\/media?parent=43462"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}