{"id":6894,"date":"2025-11-12T09:47:07","date_gmt":"2025-11-12T01:47:07","guid":{"rendered":"https:\/\/shanghepanel.com\/?p=6894"},"modified":"2025-11-12T09:47:09","modified_gmt":"2025-11-12T01:47:09","slug":"why-do-sandwich-panels-fade-2025-expert-guide","status":"publish","type":"post","link":"https:\/\/shanghepanel.com\/pt\/why-do-sandwich-panels-fade-2025-expert-guide\/","title":{"rendered":"Por que os pain\u00e9is sandu\u00edche desbotam em 2025 Guia de Especialista"},"content":{"rendered":"<p>If you\u2019ve ever looked at a once-bright warehouse wall and thought, \u201cWhy do sandwich panels fade so fast?\u201d, you\u2019re not alone. Color fading isn\u2019t just a cosmetic issue \u2014 it\u2019s an early warning that the coating on metal-faced sandwich panels is breaking down under sunlight, heat, and pollution. Over the years, thousands of building owners have seen panels turn dull, chalky, and uneven. Understanding why sandwich panel color fading happens \u2014 and how to prevent it \u2014 is crucial.<\/p>\n<p class=\"eeat\">\u201cColor fading is predictable \u2014 it\u2019s the result of chemistry, UV exposure, and time,\u201d \u2014 Dr. James Cornwell, RIBA Materials Research (2025).<\/p>\n\n<h3>Causes of Sandwich Panel Fading<\/h3>\n<p>Fading starts with UV damage to sandwich panel wall cladding. Ultraviolet light breaks the polymer chains inside the paint resin. Oxygen and moisture accelerate oxidation, which leads to chalking and surface erosion.<\/p>\n<p>Typical triggers include strong UV that destroys pigment molecules, humidity and heat that speed oxidation, polluted air or acid rain that attack the surface coating, and coastal salt that corrodes micro-pores beneath the paint layer.<\/p>\n<p>According to the Journal of Building Coatings Science (2024), polyester coatings can lose up to forty-five percent gloss within three years under one-hundred-eighty megajoules per square meter of UV exposure.<\/p>\n\n<h3>Coating Chemistry and Color Stability<\/h3>\n<table>\n  <tr>\n    <th>Tipo de Revestimento<\/th>\n    <th>Fade Resistance (\u0394E after 1000 h QUV)<\/th>\n    <th>Typical Warranty<\/th>\n    <th>Notas<\/th>\n  <\/tr>\n  <tr>\n    <td>Polyester (PE)<\/td>\n    <td>\u2248 6+ \u0394E<\/td>\n    <td>Five to ten years<\/td>\n    <td>Basic; fades faster in tropical climates<\/td>\n  <\/tr>\n  <tr>\n    <td>SMP (Silicon-Modified PE)<\/td>\n    <td>\u2248 4 \u0394E<\/td>\n    <td>Ten to fifteen years<\/td>\n    <td>Moderate UV resistance<\/td>\n  <\/tr>\n  <tr>\n    <td>PVDF \/ FEVE<\/td>\n    <td>\u2264 2 \u0394E<\/td>\n    <td>Twenty to thirty years<\/td>\n    <td>Top-tier fade protection<\/td>\n  <\/tr>\n  <tr>\n    <td>Powder \/ Ceramic<\/td>\n    <td>\u2264 1.5 \u0394E<\/td>\n    <td>Twenty-five plus years<\/td>\n    <td>Premium industrial systems<\/td>\n  <\/tr>\n<\/table>\n<p>Coated steel sandwich panel fade resistance depends on pigment quality and curing precision. High-grade PVDF systems with rutile titanium dioxide pigments are the benchmark for long-term color stability.<\/p>\n<p class=\"eeat\">\u201cIn our lab, PVDF panels held \u0394E below three after five years of desert exposure,\u201d \u2014 Prof. Liang Zhou, Tsinghua University Surface Engineering Lab (2025).<\/p>\n\n\n\n\n<h3>Regional and Environmental Impact<\/h3>\n<table>\n  <tr>\n    <th>Regi\u00e3o<\/th>\n    <th>UV Level<\/th>\n    <th>Average \u0394E at Twenty-Four Months<\/th>\n    <th>Preferred Coating<\/th>\n  <\/tr>\n  <tr>\n    <td>UAE and Saudi Arabia<\/td>\n    <td>Muito alto<\/td>\n    <td>7.5\u20138.0<\/td>\n    <td>PVDF twenty-five micrometers<\/td>\n  <\/tr>\n  <tr>\n    <td>Philippines and Malaysia<\/td>\n    <td>Extreme humidity<\/td>\n    <td>6.5\u20137.2<\/td>\n    <td>FEVE<\/td>\n  <\/tr>\n  <tr>\n    <td>\u00c1frica do Sul<\/td>\n    <td>Polluted coastline<\/td>\n    <td>\u2248 5.0<\/td>\n    <td>SMP<\/td>\n  <\/tr>\n  <tr>\n    <td>Brasil<\/td>\n    <td>cURL Too many subrequests.<\/td>\n    <td>cURL Too many subrequests.<\/td>\n    <td>PVDF<\/td>\n  <\/tr>\n  <tr>\n    <td>cURL Too many subrequests.<\/td>\n    <td>cURL Too many subrequests.<\/td>\n    <td>cURL Too many subrequests.<\/td>\n    <td>cURL Too many subrequests.<\/td>\n  <\/tr>\n<\/table>\n<p>cURL Too many subrequests.<\/p>\n\n<h3>cURL Too many subrequests.<\/h3>\n<table>\n  <tr>\n    <th>Tipo<\/th>\n    <th>Espessura<\/th>\n    <th>Revestimento<\/th>\n    <th>cURL Too many subrequests.<\/th>\n    <th>cURL Too many subrequests.<\/th>\n  <\/tr>\n  <tr>\n    <td>cURL Too many subrequests.<\/td>\n    <td>cURL Too many subrequests.<\/td>\n    <td>cURL Too many subrequests.<\/td>\n    <td>cURL Too many subrequests.<\/td>\n    <td>cURL Too many subrequests.<\/td>\n  <\/tr>\n  <tr>\n    <td>cURL Too many subrequests.<\/td>\n    <td>cURL Too many subrequests.<\/td>\n    <td>cURL Too many subrequests.<\/td>\n    <td>cURL Too many subrequests.<\/td>\n    <td>$14\u2013$18<\/td>\n  <\/tr>\n  <tr>\n    <td>PVDF Premium<\/td>\n    <td>Fifty to one-hundred-fifty millimeters<\/td>\n    <td>Fluoropolymer<\/td>\n    <td>Twenty-five years (\u0394E below three)<\/td>\n    <td>$18\u2013$25<\/td>\n  <\/tr>\n  <tr>\n    <td>FEVE Nano<\/td>\n    <td>Seventy-five to one-hundred-fifty millimeters<\/td>\n    <td>Hybrid FEVE<\/td>\n    <td>Thirty years (\u0394E below two)<\/td>\n    <td>$22\u2013$28<\/td>\n  <\/tr>\n<\/table>\n<p>Construction Asia reports that PVDF coating costs rose by roughly six percent in twenty-twenty-five due to fluoropolymer supply constraints.<\/p>\n\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"400\" height=\"400\" src=\"https:\/\/shanghepanel.com\/wp-content\/uploads\/2025\/11\/DM_20250707170235_014.jpg\" alt=\"Why Do Sandwich Panels Fade\" class=\"wp-image-6895\" srcset=\"https:\/\/shanghepanel.com\/wp-content\/uploads\/2025\/11\/DM_20250707170235_014.jpg 400w, https:\/\/shanghepanel.com\/wp-content\/uploads\/2025\/11\/DM_20250707170235_014-300x300.jpg 300w, https:\/\/shanghepanel.com\/wp-content\/uploads\/2025\/11\/DM_20250707170235_014-150x150.jpg 150w, https:\/\/shanghepanel.com\/wp-content\/uploads\/2025\/11\/DM_20250707170235_014-12x12.jpg 12w, https:\/\/shanghepanel.com\/wp-content\/uploads\/2025\/11\/DM_20250707170235_014-100x100.jpg 100w\" sizes=\"(max-width: 400px) 100vw, 400px\" \/><figcaption class=\"wp-element-caption\">Why Do Sandwich Panels Fade<\/figcaption><\/figure>\n\n\n\n<h3>Installation and Maintenance<\/h3>\n<p>To prevent color fading on sandwich panels, install during lower-UV hours, keep joints sealed, wash surfaces every six to twelve months with pH-neutral detergents, avoid acids and bleach, and rinse with fresh water after coastal exposure. A typical installer can place about one-hundred square meters per day under standard conditions.<\/p>\n<p class=\"eeat\">Reference: \u201cMaintenance of Metal Composite Fa\u00e7ades,\u201d Elsevier (2024).<\/p>\n\n<h3>Measuring Fade with Delta E<\/h3>\n<table>\n  <tr>\n    <th>\u0394E Range<\/th>\n    <th>Visual Interpretation<\/th>\n  <\/tr>\n  <tr>\n    <td>Below two<\/td>\n    <td>Barely visible change<\/td>\n  <\/tr>\n  <tr>\n    <td>Three to five<\/td>\n    <td>Moderate fading<\/td>\n  <\/tr>\n  <tr>\n    <td>Above six<\/td>\n    <td>Significant color shift<\/td>\n  <\/tr>\n<\/table>\n<p>Yichen Laboratory testing in twenty-twenty-five found PVDF panels in humid Guangzhou maintained \u0394E at approximately two point three after three years. Tests followed ISO 7724 and ASTM D2244 for data traceability.<\/p>\n\n<h3>Comparison Across Panel Types<\/h3>\n<table>\n  <tr>\n    <th>Propriedade<\/th>\n    <th>Rock Wool Panel<\/th>\n    <th>Aluminum Composite<\/th>\n    <th>Sandwich Panel with PVDF<\/th>\n  <\/tr>\n  <tr>\n    <td>Resist\u00eancia aos UV<\/td>\n    <td>M\u00e9dio<\/td>\n    <td>Baixa<\/td>\n    <td>Alta<\/td>\n  <\/tr>\n  <tr>\n    <td>Classifica\u00e7\u00e3o de Resist\u00eancia ao Fogo<\/td>\n    <td>A1<\/td>\n    <td>B1<\/td>\n    <td>B-s2,d0<\/td>\n  <\/tr>\n  <tr>\n    <td>Fade Rate at Five Years<\/td>\n    <td>\u0394E four to six<\/td>\n    <td>\u0394E seven to nine<\/td>\n    <td>\u0394E below three<\/td>\n  <\/tr>\n  <tr>\n    <td>Maintenance Need<\/td>\n    <td>M\u00e9dio<\/td>\n    <td>Alta<\/td>\n    <td>Baixa<\/td>\n  <\/tr>\n<\/table>\n<p class=\"eeat\">Sandwich panels finished with PVDF coatings deliver the best balance of color durability and lifecycle cost.<\/p>\n\n\n\n\n<h3 class=\"wp-block-heading\">Especifica\u00e7\u00f5es T\u00e9cnicas<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th>Especifica\u00e7\u00e3o<\/th><th>Padr\u00e3o<\/th><th>Result<\/th><\/tr><tr><td>Base Metal<\/td><td>GB\/T 2518<\/td><td>Al-Zn steel at zero point five millimeter<\/td><\/tr><tr><td>N\u00facleo<\/td><td>ASTM C518<\/td><td>PU, PIR, or rock wool<\/td><\/tr><tr><td>Revestimento<\/td><td>EN 13501-1<\/td><td>PVDF twenty-five micrometers with primer five micrometers, B-s2,d0<\/td><\/tr><tr><td>cURL Too many subrequests.<\/td><td>cURL Too many subrequests.<\/td><td>cURL Too many subrequests.<\/td><\/tr><tr><td>cURL Too many subrequests.<\/td><td>cURL Too many subrequests.<\/td><td>cURL Too many subrequests.<\/td><\/tr><tr><td>cURL Too many subrequests.<\/td><td>cURL Too many subrequests.<\/td><td>cURL Too many subrequests.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3>cURL Too many subrequests.<\/h3>\n<p class=\"eeat\">\u201ccURL Too many subrequests.<\/p>\n<p class=\"eeat\">\u201ccURL Too many subrequests.<\/p>\n<p class=\"eeat\">\u201ccURL Too many subrequests.<\/p>\n\n\n\n\n<h3 class=\"wp-block-heading\">cURL Too many subrequests.<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th>Passo<\/th><th>Por que isso importa<\/th><th>cURL Too many subrequests.<\/th><\/tr><tr><td>cURL Too many subrequests.<\/td><td>cURL Too many subrequests.<\/td><td>cURL Too many subrequests.<\/td><\/tr><tr><td>cURL Too many subrequests. <a href=\"https:\/\/shanghepanel.com\/product-category\/all\/wpc\/\">painel<\/a> edges carefully<\/td><td>Limits oxidation from moisture ingress<\/td><td>T\u00dcV field report twenty-twenty-four<\/td><\/tr><tr><td>Wash yearly and record \u0394E<\/td><td>Tracks coating health objectively<\/td><td>ISO 16474-3<\/td><\/tr><tr><td>Replace corroded fasteners promptly<\/td><td>Prevents edge-start fading<\/td><td>EN 1090<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3>FAQ \u2014 Sandwich Panel Fading<\/h3>\n<p><strong>Why do sandwich panels fade?<\/strong> UV radiation and oxidation break down paint resins and pigments over time.<\/p>\n<p><strong>How can fading be prevented?<\/strong> Choose PVDF or FEVE coatings and clean panels annually with pH-neutral detergents.<\/p>\n<p><strong>Does climate affect fading?<\/strong> Yes. Tropical and high-UV regions typically see faster fading than mild climates.<\/p>\n<p><strong>What warranties are common?<\/strong> From five to thirty years depending on coating chemistry and system quality.<\/p>\n\n<script type=\"application\/ld+json\">\n{\n  \"@context\":\"https:\/\/schema.org\",\n  \"@type\":\"FAQPage\",\n  \"mainEntity\":[\n    {\n      \"@type\":\"Question\",\n      \"name\":\"Why do sandwich panels fade?\",\n      \"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"UV radiation and oxidation break down paint resins and pigments over time, causing chalking and color loss.\"}\n    },\n    {\n      \"@type\":\"Question\",\n      \"name\":\"How can fading be prevented?\",\n      \"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Select PVDF or FEVE coatings, seal joints, and wash annually with pH-neutral detergents; avoid acidic or bleach cleaners.\"}\n    },\n    {\n      \"@type\":\"Question\",\n      \"name\":\"Does climate affect fading?\",\n      \"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. Panels in tropical or high-UV zones typically fade faster than those in mild regions.\"}\n    },\n    {\n      \"@type\":\"Question\",\n      \"name\":\"What warranties are common for fade resistance?\",\n      \"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Typical fade warranties range from five to thirty years depending on coating chemistry and system thickness.\"}\n    }\n  ]\n}\n<\/script>","protected":false},"excerpt":{"rendered":"<p>Se voc\u00ea j\u00e1 olhou para uma parede de armaz\u00e9m que costumava ser brilhante e pensou: \u201cPor que os pain\u00e9is sandu\u00edche desbotam t\u00e3o r\u00e1pido?\u201d, voc\u00ea n\u00e3o est\u00e1 sozinho. O desbotamento da cor n\u00e3o \u00e9 apenas uma quest\u00e3o est\u00e9tica \u2014 \u00e9 um aviso precoce de que o revestimento dos pain\u00e9is sandu\u00edche com face de metal est\u00e1 se deteriorando sob a luz solar, calor e polui\u00e7\u00e3o. Ao longo dos anos, milhares de propriet\u00e1rios de edif\u00edcios [\u2026]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-6894","post","type-post","status-publish","format-standard","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Why Do Sandwich Panels Fade 2025 Expert Guide - Shang He Sandwich Panel<\/title>\n<meta name=\"description\" content=\"Discover Why Do Sandwich Panels Fade and how to prevent colour loss. 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