{"id":25575,"date":"2026-11-14T14:53:39","date_gmt":"2026-11-14T06:53:39","guid":{"rendered":"https:\/\/www.sanait.com\/?p=25575"},"modified":"2026-11-14T14:53:40","modified_gmt":"2026-11-14T06:53:40","slug":"why-cheap-acrylic-yellows","status":"publish","type":"post","link":"https:\/\/www.sanait.com\/it\/why-cheap-acrylic-yellows\/","title":{"rendered":"Perch\u00e9 l'acrilico economico tende al giallo?"},"content":{"rendered":"\n<style>\n\/* Sanait Guide \u2014 Why Cheap Acrylic Yellows\n   Scope all rules under .sa-guide so the block does not fight the WP theme. *\/\n.sa-guide {\n  --sa-ink: #1c2430;\n  --sa-muted: #5b6573;\n  --sa-line: #d9dee6;\n  --sa-paper: #f6f4ef;\n  --sa-card: #ffffff;\n  --sa-accent: #1f5f5b;\n  --sa-accent-soft: #e6f1f0;\n  --sa-warn: #8a5a12;\n  --sa-warn-soft: #f7eedf;\n  --sa-max: 760px;\n  color: var(--sa-ink);\n  font-family: Georgia, \"Times New Roman\", Times, serif;\n  font-size: 18px;\n  line-height: 1.65;\n  letter-spacing: 0.01em;\n}\n\n.sa-guide *,\n.sa-guide *::before,\n.sa-guide *::after {\n  box-sizing: border-box;\n}\n\n.sa-guide a {\n  color: var(--sa-accent);\n  text-underline-offset: 3px;\n}\n\n.sa-guide a:hover {\n  text-decoration-thickness: 2px;\n}\n\n.sa-guide .sa-lede,\n.sa-guide p,\n.sa-guide li,\n.sa-guide figcaption,\n.sa-guide td,\n.sa-guide th,\n.sa-guide .sa-note,\n.sa-guide .sa-faq-a {\n  font-family: Georgia, \"Times New Roman\", Times, serif;\n}\n\n.sa-guide .sa-kicker,\n.sa-guide .sa-toc a,\n.sa-guide .sa-meta,\n.sa-guide .sa-chip,\n.sa-guide .sa-table caption,\n.sa-guide .sa-author-role,\n.sa-guide .sa-src-list,\n.sa-guide .sa-faq-q,\n.sa-guide h2,\n.sa-guide h3 {\n  font-family: \"Helvetica Neue\", Helvetica, Arial, sans-serif;\n}\n\n.sa-guide .sa-wrap {\n  max-width: var(--sa-max);\n  margin: 0 auto;\n}\n\n.sa-guide .sa-kicker {\n  display: flex;\n  flex-wrap: wrap;\n  gap: 8px 12px;\n  align-items: center;\n  font-size: 12px;\n  letter-spacing: 0.08em;\n  text-transform: uppercase;\n  color: var(--sa-muted);\n  margin: 0 0 18px;\n}\n\n.sa-guide .sa-chip {\n  background: var(--sa-accent-soft);\n  color: var(--sa-accent);\n  padding: 3px 8px;\n  border-radius: 999px;\n  letter-spacing: 0.06em;\n}\n\n.sa-guide .sa-lede {\n  font-size: 1.18em;\n  line-height: 1.5;\n  margin: 0 0 22px;\n}\n\n.sa-guide .sa-takeaway {\n  background: var(--sa-paper);\n  border: 1px solid var(--sa-line);\n  border-left: 4px solid var(--sa-accent);\n  padding: 18px 20px 16px;\n  margin: 0 0 28px;\n}\n\n.sa-guide .sa-takeaway h2 {\n  margin: 0 0 10px;\n  font-size: 13px;\n  letter-spacing: 0.08em;\n  text-transform: uppercase;\n  color: var(--sa-accent);\n}\n\n.sa-guide .sa-takeaway ul {\n  margin: 0;\n  padding-left: 1.15em;\n}\n\n.sa-guide .sa-takeaway li {\n  margin: 0 0 6px;\n  font-size: 0.95em;\n}\n\n.sa-guide .sa-toc {\n  background: var(--sa-card);\n  border: 1px solid var(--sa-line);\n  padding: 16px 20px 12px;\n  margin: 0 0 32px;\n}\n\n.sa-guide .sa-toc h2 {\n  margin: 0 0 8px;\n  font-size: 13px;\n  letter-spacing: 0.08em;\n  text-transform: uppercase;\n  color: var(--sa-muted);\n}\n\n.sa-guide .sa-toc ol {\n  margin: 0;\n  padding-left: 1.25em;\n}\n\n.sa-guide .sa-toc li {\n  margin: 0 0 4px;\n  font-size: 0.92em;\n  font-family: \"Helvetica Neue\", Helvetica, Arial, sans-serif;\n}\n\n.sa-guide h2 {\n  font-size: 1.35rem;\n  line-height: 1.25;\n  margin: 2.1em 0 0.6em;\n  letter-spacing: -0.01em;\n  scroll-margin-top: 88px;\n}\n\n.sa-guide h3 {\n  font-size: 1.05rem;\n  margin: 1.5em 0 0.45em;\n  scroll-margin-top: 88px;\n}\n\n.sa-guide p {\n  margin: 0 0 1em;\n}\n\n.sa-guide ul,\n.sa-guide ol {\n  margin: 0 0 1.1em;\n  padding-left: 1.2em;\n}\n\n.sa-guide li {\n  margin: 0 0 0.4em;\n}\n\n.sa-guide .sa-def {\n  background: var(--sa-accent-soft);\n  padding: 16px 18px;\n  margin: 0 0 22px;\n  border-radius: 2px;\n}\n\n.sa-guide .sa-def p {\n  margin: 0;\n}\n\n.sa-guide .sa-note {\n  background: var(--sa-warn-soft);\n  border: 1px solid #ead9b8;\n  padding: 14px 16px;\n  margin: 0 0 22px;\n  font-size: 0.95em;\n  color: #4a3a22;\n}\n\n.sa-guide .sa-note strong {\n  color: var(--sa-warn);\n}\n\n.sa-guide .sa-table-wrap {\n  overflow-x: auto;\n  margin: 0 0 22px;\n  border: 1px solid var(--sa-line);\n}\n\n.sa-guide table {\n  width: 100%;\n  border-collapse: collapse;\n  font-size: 0.88em;\n  line-height: 1.4;\n  min-width: 560px;\n}\n\n.sa-guide caption {\n  text-align: left;\n  font-size: 12px;\n  letter-spacing: 0.06em;\n  text-transform: uppercase;\n  color: var(--sa-muted);\n  padding: 10px 12px 8px;\n  background: var(--sa-paper);\n  caption-side: top;\n}\n\n.sa-guide th,\n.sa-guide td {\n  border-top: 1px solid var(--sa-line);\n  padding: 9px 12px;\n  vertical-align: top;\n  text-align: left;\n}\n\n.sa-guide thead th {\n  background: #eef1f4;\n  font-weight: 650;\n  font-family: \"Helvetica Neue\", Helvetica, Arial, sans-serif;\n  font-size: 12px;\n  letter-spacing: 0.03em;\n}\n\n.sa-guide tbody th {\n  font-family: \"Helvetica Neue\", Helvetica, Arial, sans-serif;\n  font-weight: 650;\n  width: 28%;\n}\n\n.sa-guide .sa-grid {\n  display: grid;\n  grid-template-columns: 1fr;\n  gap: 12px;\n  margin: 0 0 22px;\n}\n\n@media (min-width: 700px) {\n  .sa-guide .sa-grid-2 {\n    grid-template-columns: 1fr 1fr;\n  }\n}\n\n.sa-guide .sa-card {\n  border: 1px solid var(--sa-line);\n  padding: 14px 16px 12px;\n  background: var(--sa-card);\n}\n\n.sa-guide .sa-card h3 {\n  margin: 0 0 8px;\n  font-size: 0.95rem;\n}\n\n.sa-guide .sa-card p:last-child,\n.sa-guide .sa-card ul:last-child {\n  margin-bottom: 0;\n}\n\n.sa-guide .sa-faq {\n  border-top: 1px solid var(--sa-line);\n  margin: 0 0 22px;\n}\n\n.sa-guide .sa-faq-item {\n  border-bottom: 1px solid var(--sa-line);\n  padding: 14px 0 12px;\n}\n\n.sa-guide .sa-faq-q {\n  margin: 0 0 6px;\n  font-size: 1rem;\n  font-weight: 650;\n}\n\n.sa-guide .sa-faq-a {\n  margin: 0;\n}\n\n.sa-guide .sa-author {\n  display: grid;\n  grid-template-columns: 1fr;\n  gap: 8px;\n  background: var(--sa-paper);\n  border: 1px solid var(--sa-line);\n  padding: 18px 20px;\n  margin: 28px 0 22px;\n}\n\n.sa-guide .sa-author h2 {\n  margin: 0;\n  font-size: 13px;\n  letter-spacing: 0.08em;\n  text-transform: uppercase;\n  color: var(--sa-muted);\n}\n\n.sa-guide .sa-author-name {\n  font-weight: 700;\n  font-family: \"Helvetica Neue\", Helvetica, Arial, sans-serif;\n  margin: 0;\n}\n\n.sa-guide .sa-author-role {\n  margin: 0;\n  color: var(--sa-muted);\n  font-size: 0.88em;\n}\n\n.sa-guide .sa-src h2 {\n  margin-top: 1.6em;\n}\n\n.sa-guide .sa-src-list {\n  font-size: 0.88em;\n  color: var(--sa-muted);\n}\n\n.sa-guide .sa-src-list li {\n  margin: 0 0 8px;\n}\n\n.sa-guide .sa-related {\n  margin: 0 0 8px;\n}\n\n.sa-guide .sa-related ul {\n  margin-bottom: 0;\n}\n\n.sa-guide .sa-meta {\n  font-size: 13px;\n  color: var(--sa-muted);\n  margin: 0 0 18px;\n}\n\n<\/style>\n<div class=\"sa-guide\">\n  <div class=\"sa-wrap\">\n\n    <p class=\"sa-kicker\">\n      <span class=\"sa-chip\">Material guide<\/span>\n      <span>Yellowing<\/span>\n    <\/p>\n\n    <p class=\"sa-meta\">By David Deng \u00b7 R&#038;D manager, Sanait \u00b7 Updated November 2026<\/p>\n\n    <p class=\"sa-lede\">Cheap acrylic yellows when a low grade meets ultraviolet light, heat, or the wrong cleaner \u2014 not because the word acrylic means it will turn. A window face in generic extruded sheet is the usual case. A virgin cast grade specified for outdoor exposure is a different case. Price is a clue. It is not the mechanism.<\/p>\n\n    <aside class=\"sa-takeaway\" aria-label=\"Key takeaways\">\n      <h2>Key takeaways<\/h2>\n      <ul>\n        <li>Yellowing is a grade-and-exposure problem. It is not a property of all PMMA.<\/li>\n        <li>The usual cheap path is generic extruded sheet, unspecified UV performance, then sun or strong shop light.<\/li>\n        <li>Cast is not a UV specification. Outdoor life has to be asked for.<\/li>\n        <li>Do not publish a \u201cyellows in X years\u201d figure without the grade, the exposure, and the method.<\/li>\n        <li>A haze from wiping is not the same defect as UV yellowing. Name which one you see.<\/li>\n        <li>The fix is the grade on the next order, not a thicker wall of the same sheet.<\/li>\n      <\/ul>\n    <\/aside>\n\n    <nav class=\"sa-toc\" aria-label=\"On this page\">\n      <h2>On this page<\/h2>\n      <ol>\n        <li><a href=\"#answer\">The short answer<\/a><\/li>\n        <li><a href=\"#what\">What yellowing is<\/a><\/li>\n        <li><a href=\"#why-cheap\">Why the cheap sheet is the one that shows it<\/a><\/li>\n        <li><a href=\"#not\">What is not yellowing<\/a><\/li>\n        <li><a href=\"#choose\">What to specify instead<\/a><\/li>\n        <li><a href=\"#specify\">What to write on the RFQ<\/a><\/li>\n        <li><a href=\"#faq\">FAQ<\/a><\/li>\n        <li><a href=\"#sources\">Sources<\/a><\/li>\n      <\/ol>\n    <\/nav>\n\n    <h2 id=\"answer\">The short answer<\/h2>\n\n    <div class=\"sa-def\">\n      <p><strong>Working answer.<\/strong> Cheap acrylic yellows because the sheet was not specified for the light it will see. UV breaks down an unstabilized or low grade over time and the face shifts toward yellow. Specify the exposure and the grade. Do not buy \u201ccast\u201d or \u201cthicker\u201d as a substitute for that sentence.<\/p>\n    <\/div>\n\n    <h2 id=\"what\">What yellowing is<\/h2>\n\n    <p>PMMA can change color when ultraviolet radiation, sometimes with heat, degrades the polymer or the additives in it. The face that was colorless picks up a yellow tint. How fast that happens depends on the grade, the UV package if any, the hours of sun or strong light, and the temperature. It does not depend on the nickname \u2014 plexiglass, Perspex, Lucite \u2014 and it does not depend on price alone.<\/p>\n\n    <p>ISO 7823 defines cast and extruded sheet. It does not set a yellowing life. A weathering claim belongs to a named grade and a named test, such as a xenon or outdoor exposure the supplier will actually cite. Without those, a year-count is advertising.<\/p>\n\n    <h2 id=\"why-cheap\">Why the cheap sheet is the one that shows it<\/h2>\n\n    <p>A low price usually means several things were left off the brief at once:<\/p>\n    <ul>\n      <li><strong>Generic extruded sheet.<\/strong> Extruded is a legitimate route for hidden parts. As an unspecified \u201cclear acrylic\u201d in a window, it is the sheet most often blamed later.<\/li>\n      <li><strong>No UV line.<\/strong> The quote matched a photo. Nobody wrote outdoor, window, or UV-stable.<\/li>\n      <li><strong>Unknown feedstock.<\/strong> A recycled or mixed sheet can be clear on day one and less predictable in the sun. Virgin was not written either.<\/li>\n      <li><strong>The edge was the whole specification.<\/strong> Polish and price were discussed. Exposure was not.<\/li>\n    <\/ul>\n\n    <p>Cast sheet from a known mill, with a stated outdoor or UV grade, is the usual way to reduce the risk. It is not magic. A cast sheet with no UV claim, left in a south-facing window, can still shift. The route and the grade are different lines.<\/p>\n\n    <div class=\"sa-table-wrap\">\n      <table>\n        <caption>What buyers mix up with yellowing<\/caption>\n        <thead>\n          <tr>\n            <th scope=\"col\">What you see<\/th>\n            <th scope=\"col\">Usual cause<\/th>\n            <th scope=\"col\">What to change<\/th>\n          <\/tr>\n        <\/thead>\n        <tbody>\n          <tr>\n            <th scope=\"row\">Slow yellow tint on a window face<\/th>\n            <td>UV on an unspecified grade<\/td>\n            <td>Name exposure; ask for a UV or outdoor grade<\/td>\n          <\/tr>\n          <tr>\n            <th scope=\"row\">Even tint on a cheap indoor sign<\/th>\n            <td>Grade, or strong artificial UV, or age<\/td>\n            <td>Grade, not thickness<\/td>\n          <\/tr>\n          <tr>\n            <th scope=\"row\">Cloudy wipe marks<\/th>\n            <td>Grit, a dry cloth, or a cleaner<\/td>\n            <td>Cleaning method \u2014 this is not UV yellowing<\/td>\n          <\/tr>\n          <tr>\n            <th scope=\"row\">White halo at a joint<\/th>\n            <td>Solvent blush<\/td>\n            <td>Bond practice \u2014 not weathering<\/td>\n          <\/tr>\n        <\/tbody>\n      <\/table>\n    <\/div>\n\n    <h2 id=\"not\">What is not yellowing<\/h2>\n\n    <p>A face that looks tired after staff wipe it is usually abrasion or crazing, not UV. Alcohol on a stressed acrylic face can craze it. A dry cloth on dust hazes it. Those defects can sit on an excellent UV grade. Fixing the cleaner does not fix a window grade, and specifying UV does not make the face scratch-proof.<\/p>\n\n    <p>Thicker sheet does not block the mechanism. A 10 mm wall of the same unspecified grade still sees the same light on its outer face.<\/p>\n\n    <h2 id=\"choose\">What to specify instead<\/h2>\n\n    <div class=\"sa-grid sa-grid-2\">\n      <div class=\"sa-card\">\n        <h3>Indoor, away from windows<\/h3>\n        <p>Yellowing risk is lower. Virgin cast or extruded, stated, is usually enough. Still say indoor, so nobody prices an outdoor grade you do not need.<\/p>\n      <\/div>\n      <div class=\"sa-card\">\n        <h3>Shop window or outdoor face<\/h3>\n        <p>Write the exposure. Ask what the supplier will say about yellowing for that grade. Cast plus a UV or outdoor line is the usual answer. Get it in the quote.<\/p>\n      <\/div>\n      <div class=\"sa-card\">\n        <h3>A tint that must stay<\/h3>\n        <p>Color shift is the same problem in a different form. Approve a weathered sample, or accept that a swatch is day-one color only.<\/p>\n      <\/div>\n      <div class=\"sa-card\">\n        <h3>Replacing a yellowed part<\/h3>\n        <p>Do not reorder \u201cthe same acrylic.\u201d Reorder with the grade and the exposure written. The first order is why it yellowed.<\/p>\n      <\/div>\n    <\/div>\n\n    <p>Faces this decision sits on: window-line <a href=\"https:\/\/www.sanait.com\/custom-acrylic-boxes\/\">boxes<\/a>, <a href=\"https:\/\/www.sanait.com\/\">stands<\/a>, and any clear <a href=\"https:\/\/www.sanait.com\/custom-acrylic-trays\/\">tray<\/a> that lives in sun.<\/p>\n\n    <h2 id=\"specify\">What to write on the RFQ<\/h2>\n\n    <ol>\n      <li>Indoor, window, or outdoor \u2014 and whether the face is in direct sun.<\/li>\n      <li>Virgin, and cast or extruded.<\/li>\n      <li>That yellowing resistance is required, if it is \u2014 and what evidence you want (grade name, supplier note, test reference).<\/li>\n      <li>That \u201cacrylic\u201d alone is not accepted as that evidence.<\/li>\n    <\/ol>\n\n    <p>Sanait will ask about exposure when a brief is only \u201cclear acrylic,\u201d because the sheet and the light are different questions. Intake is on the <a href=\"https:\/\/www.sanait.com\/faq\/\">FAQ<\/a>. Scope is on the <a href=\"https:\/\/www.sanait.com\/about-us\/\">about page<\/a>.<\/p>\n\n    <h2 id=\"faq\">FAQ<\/h2>\n\n    <div class=\"sa-faq\">\n      <div class=\"sa-faq-item\">\n        <h3 class=\"sa-faq-q\">Why does cheap acrylic turn yellow?<\/h3>\n        <p class=\"sa-faq-a\">Because a low or unspecified grade was put in UV \u2014 sun or strong light \u2014 without a weathering line on the order. Price marked the shortcut. UV did the work.<\/p>\n      <\/div>\n      <div class=\"sa-faq-item\">\n        <h3 class=\"sa-faq-q\">Does all acrylic yellow?<\/h3>\n        <p class=\"sa-faq-a\">No. It depends on grade and exposure. Indoor virgin sheet away from windows is a different case from generic sheet in a shop window.<\/p>\n      <\/div>\n      <div class=\"sa-faq-item\">\n        <h3 class=\"sa-faq-q\">Does cast acrylic yellow less?<\/h3>\n        <p class=\"sa-faq-a\">Cast is the usual base for a better outdoor grade. Cast by itself is not a UV specification. Ask for the grade.<\/p>\n      <\/div>\n      <div class=\"sa-faq-item\">\n        <h3 class=\"sa-faq-q\">Will a UV-stable grade never yellow?<\/h3>\n        <p class=\"sa-faq-a\">\u201cNever\u201d is not a test result. A named grade with a stated exposure is as far as an honest quote goes. A year-count without method and grade should not be published.<\/p>\n      <\/div>\n      <div class=\"sa-faq-item\">\n        <h3 class=\"sa-faq-q\">Is a cloudy face the same as a yellow face?<\/h3>\n        <p class=\"sa-faq-a\">Usually no. Clouding from wipes is abrasion or crazing. Yellowing is a color shift from light and grade. They can both be present. They are fixed differently.<\/p>\n      <\/div>\n      <div class=\"sa-faq-item\">\n        <h3 class=\"sa-faq-q\">Does thicker acrylic resist yellowing?<\/h3>\n        <p class=\"sa-faq-a\">No. Thickness does not replace a UV grade. The outer face still sees the light.<\/p>\n      <\/div>\n    <\/div>\n\n    <div class=\"sa-author\" id=\"author\">\n      <h2>About the author<\/h2>\n      <p class=\"sa-author-name\">David Deng<\/p>\n      <p class=\"sa-author-role\">R&#038;D manager at Sanait. 10+ years in acrylic fabrication; 2,000+ custom acrylic projects shipped across 20+ countries.<\/p>\n      <p>Sanait Co., Ltd. builds custom acrylic displays in Dongguan. This note is general. It does not state a service life. Plant terms are on the <a href=\"https:\/\/www.sanait.com\/faq\/\">FAQ<\/a>. Background is on the <a href=\"https:\/\/www.sanait.com\/about-us\/\">about page<\/a>.<\/p>\n    <\/div>\n\n    <div class=\"sa-related\">\n      <h2>Factory pages<\/h2>\n      <ul>\n        <li><a href=\"https:\/\/www.sanait.com\/faq\/\">Custom acrylic FAQ<\/a><\/li>\n        <li><a href=\"https:\/\/www.sanait.com\/about-us\/\">About Sanait<\/a><\/li>\n        <li><a href=\"https:\/\/www.sanait.com\/custom-acrylic-boxes\/\">Custom acrylic boxes<\/a><\/li>\n        <li><a href=\"https:\/\/www.sanait.com\/custom-acrylic-trays\/\">Custom acrylic trays<\/a><\/li>\n        <li><a href=\"https:\/\/www.sanait.com\/\">Custom display stands<\/a><\/li>\n      <\/ul>\n    <\/div>\n\n    <section class=\"sa-src\" id=\"sources\">\n      <h2>Sources<\/h2>\n      <p>The standards identify the sheet. They do not set a yellowing life. Weathering methods are cited so a claim can be tied to a test, not to a brochure year.<\/p>\n      <ol class=\"sa-src-list\">\n        <li>ISO 7823-1:2003, <em>Plastics \u2014 Poly(methyl methacrylate) sheets \u2014 Part 1: Cast sheets<\/em>. <a href=\"https:\/\/www.iso.org\/standard\/33450.html\" rel=\"nofollow noopener\" target=\"_blank\">iso.org<\/a><\/li>\n        <li>ISO 7823-2:2003, <em>Plastics \u2014 Poly(methyl methacrylate) sheets \u2014 Part 2: Extruded sheets<\/em>. <a href=\"https:\/\/www.iso.org\/standard\/28757.html\" rel=\"nofollow noopener\" target=\"_blank\">iso.org<\/a><\/li>\n        <li>ISO 4892-2:2013, <em>Plastics \u2014 Methods of exposure to laboratory light sources \u2014 Part 2: Xenon-arc lamps<\/em>. A common laboratory weathering method. Cite it only with the grade and the conditions used. <a href=\"https:\/\/www.iso.org\/standard\/55481.html\" rel=\"nofollow noopener\" target=\"_blank\">iso.org<\/a><\/li>\n        <li>\u201cPoly(methyl methacrylate).\u201d <em>Wikipedia<\/em>. <a href=\"https:\/\/en.wikipedia.org\/wiki\/Poly(methyl_methacrylate)\" rel=\"nofollow noopener\" target=\"_blank\">en.wikipedia.org<\/a><\/li>\n      <\/ol>\n    <\/section>\n\n  <\/div>\n<\/div>\n\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@graph\": [\n    {\n      \"@type\": \"Article\",\n      \"headline\": \"Why Cheap Acrylic Yellows\",\n      \"description\": \"Cheap acrylic yellows when an unspecified grade meets UV. Cast is not a UV specification. Name the exposure and the grade \u2014 do not publish a year-count without a test.\",\n      \"inLanguage\": \"en\",\n      \"author\": {\n        \"@type\": \"Person\",\n        \"name\": \"David Deng\",\n        \"jobTitle\": \"R&D manager\",\n        \"worksFor\": {\"@type\": \"Organization\", \"name\": \"Sanait Co., Ltd.\", \"url\": \"https:\/\/www.sanait.com\/\"}\n      },\n      \"publisher\": {\"@type\": \"Organization\", \"name\": \"Sanait\", \"url\": \"https:\/\/www.sanait.com\/\"},\n      \"dateModified\": \"2026-11-14\"\n    },\n    {\n      \"@type\": \"FAQPage\",\n      \"mainEntity\": [\n        {\n          \"@type\": \"Question\",\n          \"name\": \"Why does cheap acrylic turn yellow?\",\n          \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Because a low or unspecified grade was put in UV without a weathering line on the order. Price marked the shortcut. UV did the work.\"}\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"Does all acrylic yellow?\",\n          \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No. It depends on grade and exposure. Indoor virgin sheet away from windows is a different case from generic sheet in a shop window.\"}\n        }\n      ]\n    }\n  ]\n}\n<\/script>\n","protected":false},"excerpt":{"rendered":"<p>Material guide Yellowing By David Deng \u00b7 R&#038;D manager, Sanait \u00b7 Updated November 2026 Cheap acrylic yellows when a low grade meets ultraviolet light, heat, or the wrong cleaner \u2014 not because the word acrylic means it will turn. A window face in generic extruded sheet is the usual case. A virgin cast grade specified [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-25575","post","type-post","status-publish","format-standard","hentry","category-industrial-news"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Why Cheap Acrylic Yellows, and What to Specify<\/title>\n<meta name=\"description\" content=\"Cheap acrylic yellows when an unspecified grade meets UV. Cast is not a UV specification. Name the exposure and the grade, not a brochure year-count.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.sanait.com\/it\/why-cheap-acrylic-yellows\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Why Cheap Acrylic Yellows, and What to Specify\" \/>\n<meta property=\"og:description\" content=\"Cheap acrylic yellows when an unspecified grade meets UV. Cast is not a UV specification. Name the exposure and the grade, not a brochure year-count.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.sanait.com\/it\/why-cheap-acrylic-yellows\/\" \/>\n<meta property=\"og:site_name\" content=\"Sanait Co., Ltd\" \/>\n<meta property=\"article:published_time\" content=\"2026-11-14T06:53:39+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-11-14T06:53:40+00:00\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:label1\" content=\"Scritto da\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tempo di lettura stimato\" \/>\n\t<meta name=\"twitter:data2\" content=\"6 minuti\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.sanait.com\\\/why-cheap-acrylic-yellows\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.sanait.com\\\/why-cheap-acrylic-yellows\\\/\"},\"author\":{\"name\":\"admin\",\"@id\":\"https:\\\/\\\/www.sanait.com\\\/#\\\/schema\\\/person\\\/28d038ce002cbf4113df5e469956a6e8\"},\"headline\":\"Why Cheap Acrylic Yellows\",\"datePublished\":\"2026-11-14T06:53:39+00:00\",\"dateModified\":\"2026-11-14T06:53:40+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.sanait.com\\\/why-cheap-acrylic-yellows\\\/\"},\"wordCount\":1255,\"publisher\":{\"@id\":\"https:\\\/\\\/www.sanait.com\\\/#organization\"},\"articleSection\":[\"Industrial News\"],\"inLanguage\":\"it-IT\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.sanait.com\\\/why-cheap-acrylic-yellows\\\/\",\"url\":\"https:\\\/\\\/www.sanait.com\\\/why-cheap-acrylic-yellows\\\/\",\"name\":\"Why Cheap Acrylic Yellows, and What to Specify\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.sanait.com\\\/#website\"},\"datePublished\":\"2026-11-14T06:53:39+00:00\",\"dateModified\":\"2026-11-14T06:53:40+00:00\",\"description\":\"Cheap acrylic yellows when an unspecified grade meets UV. Cast is not a UV specification. Name the exposure and the grade, not a brochure year-count.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.sanait.com\\\/why-cheap-acrylic-yellows\\\/#breadcrumb\"},\"inLanguage\":\"it-IT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.sanait.com\\\/why-cheap-acrylic-yellows\\\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.sanait.com\\\/why-cheap-acrylic-yellows\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.sanait.com\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Why Cheap Acrylic Yellows\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.sanait.com\\\/#website\",\"url\":\"https:\\\/\\\/www.sanait.com\\\/\",\"name\":\"Sanait Co., Ltd\",\"description\":\"Premium Custom Acrylic Solutions\",\"publisher\":{\"@id\":\"https:\\\/\\\/www.sanait.com\\\/#organization\"},\"alternateName\":\"Sanait\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.sanait.com\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"it-IT\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/www.sanait.com\\\/#organization\",\"name\":\"Sanait Co Ltd\",\"url\":\"https:\\\/\\\/www.sanait.com\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"it-IT\",\"@id\":\"https:\\\/\\\/www.sanait.com\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/www.sanait.com\\\/wp-content\\\/uploads\\\/2021\\\/07\\\/new-logo-20210714.png\",\"contentUrl\":\"https:\\\/\\\/www.sanait.com\\\/wp-content\\\/uploads\\\/2021\\\/07\\\/new-logo-20210714.png\",\"width\":395,\"height\":80,\"caption\":\"Sanait Co Ltd\"},\"image\":{\"@id\":\"https:\\\/\\\/www.sanait.com\\\/#\\\/schema\\\/logo\\\/image\\\/\"}},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/www.sanait.com\\\/#\\\/schema\\\/person\\\/28d038ce002cbf4113df5e469956a6e8\",\"name\":\"admin\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Perch\u00e9 l\u2019acrilico economico tende al giallo e cosa specificare","description":"L'acrilico economico ingiallisce quando un tipo non specificato viene esposto ai raggi UV. Il termine \"cast\" non indica una specifica relativa ai raggi UV. Indicare il tipo di esposizione e il tipo di prodotto, non l'anno di pubblicazione del catalogo.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.sanait.com\/it\/why-cheap-acrylic-yellows\/","og_locale":"it_IT","og_type":"article","og_title":"Why Cheap Acrylic Yellows, and What to Specify","og_description":"Cheap acrylic yellows when an unspecified grade meets UV. Cast is not a UV specification. Name the exposure and the grade, not a brochure year-count.","og_url":"https:\/\/www.sanait.com\/it\/why-cheap-acrylic-yellows\/","og_site_name":"Sanait Co., Ltd","article_published_time":"2026-11-14T06:53:39+00:00","article_modified_time":"2026-11-14T06:53:40+00:00","author":"admin","twitter_misc":{"Scritto da":"admin","Tempo di lettura stimato":"6 minuti"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.sanait.com\/why-cheap-acrylic-yellows\/#article","isPartOf":{"@id":"https:\/\/www.sanait.com\/why-cheap-acrylic-yellows\/"},"author":{"name":"admin","@id":"https:\/\/www.sanait.com\/#\/schema\/person\/28d038ce002cbf4113df5e469956a6e8"},"headline":"Why Cheap Acrylic Yellows","datePublished":"2026-11-14T06:53:39+00:00","dateModified":"2026-11-14T06:53:40+00:00","mainEntityOfPage":{"@id":"https:\/\/www.sanait.com\/why-cheap-acrylic-yellows\/"},"wordCount":1255,"publisher":{"@id":"https:\/\/www.sanait.com\/#organization"},"articleSection":["Industrial News"],"inLanguage":"it-IT"},{"@type":"WebPage","@id":"https:\/\/www.sanait.com\/why-cheap-acrylic-yellows\/","url":"https:\/\/www.sanait.com\/why-cheap-acrylic-yellows\/","name":"Perch\u00e9 l\u2019acrilico economico tende al giallo e cosa specificare","isPartOf":{"@id":"https:\/\/www.sanait.com\/#website"},"datePublished":"2026-11-14T06:53:39+00:00","dateModified":"2026-11-14T06:53:40+00:00","description":"L'acrilico economico ingiallisce quando un tipo non specificato viene esposto ai raggi UV. Il termine \"cast\" non indica una specifica relativa ai raggi UV. Indicare il tipo di esposizione e il tipo di prodotto, non l'anno di pubblicazione del catalogo.","breadcrumb":{"@id":"https:\/\/www.sanait.com\/why-cheap-acrylic-yellows\/#breadcrumb"},"inLanguage":"it-IT","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.sanait.com\/why-cheap-acrylic-yellows\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.sanait.com\/why-cheap-acrylic-yellows\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.sanait.com\/"},{"@type":"ListItem","position":2,"name":"Why Cheap Acrylic Yellows"}]},{"@type":"WebSite","@id":"https:\/\/www.sanait.com\/#website","url":"https:\/\/www.sanait.com\/","name":"Sanait Co., Ltd","description":"Soluzioni personalizzate di alta qualit\u00e0 in acrilico","publisher":{"@id":"https:\/\/www.sanait.com\/#organization"},"alternateName":"Sanait","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.sanait.com\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"it-IT"},{"@type":"Organization","@id":"https:\/\/www.sanait.com\/#organization","name":"Sanait Co Ltd","url":"https:\/\/www.sanait.com\/","logo":{"@type":"ImageObject","inLanguage":"it-IT","@id":"https:\/\/www.sanait.com\/#\/schema\/logo\/image\/","url":"https:\/\/www.sanait.com\/wp-content\/uploads\/2021\/07\/new-logo-20210714.png","contentUrl":"https:\/\/www.sanait.com\/wp-content\/uploads\/2021\/07\/new-logo-20210714.png","width":395,"height":80,"caption":"Sanait Co Ltd"},"image":{"@id":"https:\/\/www.sanait.com\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"https:\/\/www.sanait.com\/#\/schema\/person\/28d038ce002cbf4113df5e469956a6e8","name":"amministratore"}]}},"_links":{"self":[{"href":"https:\/\/www.sanait.com\/it\/wp-json\/wp\/v2\/posts\/25575","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.sanait.com\/it\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.sanait.com\/it\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.sanait.com\/it\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.sanait.com\/it\/wp-json\/wp\/v2\/comments?post=25575"}],"version-history":[{"count":1,"href":"https:\/\/www.sanait.com\/it\/wp-json\/wp\/v2\/posts\/25575\/revisions"}],"predecessor-version":[{"id":25576,"href":"https:\/\/www.sanait.com\/it\/wp-json\/wp\/v2\/posts\/25575\/revisions\/25576"}],"wp:attachment":[{"href":"https:\/\/www.sanait.com\/it\/wp-json\/wp\/v2\/media?parent=25575"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.sanait.com\/it\/wp-json\/wp\/v2\/categories?post=25575"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.sanait.com\/it\/wp-json\/wp\/v2\/tags?post=25575"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}