{"id":25545,"date":"2026-11-09T14:16:46","date_gmt":"2026-11-09T06:16:46","guid":{"rendered":"https:\/\/www.sanait.com\/?p=25545"},"modified":"2026-11-09T14:17:15","modified_gmt":"2026-11-09T06:17:15","slug":"acrylic-thickness-tolerance-cast-vs-extruded","status":"publish","type":"post","link":"https:\/\/www.sanait.com\/es\/acrylic-thickness-tolerance-cast-vs-extruded\/","title":{"rendered":"Tolerancia en el espesor del acr\u00edlico: moldeado frente a extruido"},"content":{"rendered":"\n<style>\n\/* Sanait Guide \u2014 Thickness Tolerance Cast Extruded\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: 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class=\"sa-wrap\">\n\n    <p class=\"sa-kicker\">\n      <span class=\"sa-chip\">Specification guide<\/span>\n      <span>Thickness tolerance<\/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\">A nominal thickness is a name, not a measured wall. Cast acrylic is allowed to vary more than extruded acrylic under the ISO sheet standards. That is why a slot designed to a single number binds, and why two \u201c5 mm\u201d faces do not always meet cleanly. Write the route, and design the fit for the tolerance \u2014 not for the label.<\/p>\n\n    <aside class=\"sa-takeaway\" aria-label=\"Key takeaways\">\n      <h2>Key takeaways<\/h2>\n      <ul>\n        <li>Cast sheet is generally the wider thickness tolerance. Extruded is generally the tighter one.<\/li>\n        <li>ISO 7823-1 states cast thickness tolerance as \u00b1(0.4 mm + 0.1 \u00d7 nominal thickness), for 1.5\u201325 mm sheet up to 6 m\u00b2.<\/li>\n        <li>ISO 7823-2 states extruded tolerance as \u00b110% from 1.5 mm to under 3 mm, and \u00b15% from 3 mm to 20 mm.<\/li>\n        <li>Those figures are the standard\u2019s limits, not a promise from every mill. A tighter mill sheet overrides them only if the quote says so.<\/li>\n        <li>Press fits and solvent joints need an allowance. Designing to the nominal is how parts do not assemble.<\/li>\n        <li>Do not invent a single \u201c\u00b110% for cast\u201d and treat it as universal.<\/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 a tolerance is<\/a><\/li>\n        <li><a href=\"#numbers\">What the standards actually say<\/a><\/li>\n        <li><a href=\"#means\">What that means on a 5 mm wall<\/a><\/li>\n        <li><a href=\"#design\">Designing the fit<\/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>Decision rule.<\/strong> If a slot, a press fit, or a mating wall depends on thickness, start with extruded acrylic and still leave an allowance. If the edge must be polished or the joint must disappear, start with cast and design the fit for the wider cast tolerance. Do not design either part to the nominal alone.<\/p>\n    <\/div>\n\n    <h2 id=\"what\">What a tolerance is<\/h2>\n\n    <p>Tolerance is the band the sheet is allowed to sit in, within a sheet and from sheet to sheet. It is not the thickness you hoped for. Cast acrylic is poured and cured between plates, so the band is wider. Extruded acrylic is pushed through a die, so the band is tighter. Both are PMMA. The nickname on the email does not state the band.<\/p>\n\n    <p>A mill can sell inside the ISO band, or agree a tighter one. Unless the quote names the mill tolerance, the safe reading is the standard for that route \u2014 and only inside the thickness and area the standard covers.<\/p>\n\n    <h2 id=\"numbers\">What the standards actually say<\/h2>\n\n    <p>These are the published limits, with their scope. They are not a factory guarantee, and they do not apply outside the ranges named.<\/p>\n\n    <div class=\"sa-table-wrap\">\n      <table>\n        <caption>Thickness tolerance in ISO 7823 \u2014 as stated, with scope<\/caption>\n        <thead>\n          <tr>\n            <th scope=\"col\"><\/th>\n            <th scope=\"col\">Cell-cast (ISO 7823-1:2003)<\/th>\n            <th scope=\"col\">Extruded (ISO 7823-2:2003)<\/th>\n          <\/tr>\n        <\/thead>\n        <tbody>\n          <tr>\n            <th scope=\"row\">Thickness covered<\/th>\n            <td>1.5 mm to 25 mm<\/td>\n            <td>1.5 mm to 20 mm<\/td>\n          <\/tr>\n          <tr>\n            <th scope=\"row\">Area limit in the clause<\/th>\n            <td>Sheets up to 6 m\u00b2<\/td>\n            <td>Stated for the thickness ranges below<\/td>\n          <\/tr>\n          <tr>\n            <th scope=\"row\">Tolerance<\/th>\n            <td>\u00b1(0.4 mm + 0.1 \u00d7 h), where h is nominal thickness in mm<\/td>\n            <td>\u00b110% from 1.5 mm to under 3 mm; \u00b15% from 3 mm to 20 mm<\/td>\n          <\/tr>\n          <tr>\n            <th scope=\"row\">Applies<\/th>\n            <td>Within a sheet and from sheet to sheet<\/td>\n            <td>Within a sheet and from sheet to sheet<\/td>\n          <\/tr>\n          <tr>\n            <th scope=\"row\">Outside the range<\/th>\n            <td>Agree it<\/td>\n            <td>Agree it<\/td>\n          <\/tr>\n        <\/tbody>\n      <\/table>\n    <\/div>\n\n    <p>Outside those thicknesses, or on a continuous-cast sheet covered by a different part of the series, do not reuse these numbers. Ask.<\/p>\n\n    <h2 id=\"means\">What that means on a 5 mm wall<\/h2>\n\n    <p>Using only the formulas above, as an illustration \u2014 not as this factory\u2019s measured stock:<\/p>\n    <ul>\n      <li>Cast, nominal 5 mm: \u00b1(0.4 + 0.1 \u00d7 5) = \u00b10.9 mm. The standard allows about 4.1 mm to 5.9 mm.<\/li>\n      <li>Extruded, nominal 5 mm: \u00b15%, so about 4.75 mm to 5.25 mm.<\/li>\n    <\/ul>\n\n    <p>A slot drawn at 5.0 mm for a \u201c5 mm\u201d cast tab can be tight or loose depending on which end of the band both pieces landed on. That is a design problem, not a cutting problem. The same nominal on extruded is a narrower argument, and still not zero.<\/p>\n\n    <p>Thinner sheet does not remove the issue. On extruded under 3 mm the standard\u2019s band is \u00b110%, which on a 2 mm sheet is \u00b10.2 mm. On cast the formula still adds the 0.4 mm term, so thin cast is a wide band relative to the wall.<\/p>\n\n    <h2 id=\"design\">Designing the fit<\/h2>\n\n    <div class=\"sa-grid sa-grid-2\">\n      <div class=\"sa-card\">\n        <h3>Press-fit or slot<\/h3>\n        <p>Prefer extruded if the edge is not a show edge. Leave clearance for the band, not for the nominal. State the fit you need: slip, location, or interference.<\/p>\n      <\/div>\n      <div class=\"sa-card\">\n        <h3>Solvent-bonded corner<\/h3>\n        <p>Cast is the usual sheet. Two walls at opposite ends of the cast band will not meet as drawn. A fit allowance, or a joint designed to hide a small step, belongs on the drawing.<\/p>\n      <\/div>\n      <div class=\"sa-card\">\n        <h3>Mixed route in one box<\/h3>\n        <p>Cast show face against an extruded back is normal. Their bands differ. Do not detail the joint as if both were the nominal.<\/p>\n      <\/div>\n      <div class=\"sa-card\">\n        <h3>A fit that must be tighter than ISO<\/h3>\n        <p>That is a purchasing line: name the mill tolerance, or agree a selected-sheet range. It is not implied by \u201cprecision acrylic.\u201d<\/p>\n      <\/div>\n    <\/div>\n\n    <p>Parts where this shows up: slotted <a href=\"https:\/\/www.sanait.com\/custom-acrylic-trays\/\">trays<\/a>, bonded <a href=\"https:\/\/www.sanait.com\/custom-acrylic-boxes\/\">boxes<\/a>, and interlocking <a href=\"https:\/\/www.sanait.com\/\">stands<\/a>.<\/p>\n\n    <h2 id=\"specify\">What to write on the RFQ<\/h2>\n\n    <ol>\n      <li>PMMA, cast or extruded, per member.<\/li>\n      <li>Nominal thickness, and whether a fit depends on it.<\/li>\n      <li>The tolerance you need if it is tighter than the ISO band \u2014 otherwise say \u201cISO 7823 for the route.\u201d<\/li>\n      <li>How thickness will be checked: where on the sheet, film removed, and the instrument if you care.<\/li>\n    <\/ol>\n\n    <p>A quote that does not restate route and nominal thickness cannot be checked against either standard.<\/p>\n\n    <p>Sanait will ask which route when a brief says only \u201c5 mm acrylic,\u201d because the allowed band changes with the route. 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\">Which acrylic has the tighter thickness tolerance?<\/h3>\n        <p class=\"sa-faq-a\">Extruded, under ISO 7823-2, compared with cell-cast under ISO 7823-1. A named mill can be tighter than either. The quote has to say so.<\/p>\n      <\/div>\n      <div class=\"sa-faq-item\">\n        <h3 class=\"sa-faq-q\">Is cast always \u00b110%?<\/h3>\n        <p class=\"sa-faq-a\">No. ISO 7823-1 states \u00b1(0.4 mm + 0.1 \u00d7 nominal thickness) for 1.5\u201325 mm sheet up to 6 m\u00b2. That is not a flat 10%, and it is not every sheet on the market.<\/p>\n      <\/div>\n      <div class=\"sa-faq-item\">\n        <h3 class=\"sa-faq-q\">Why did my 5 mm slot not fit?<\/h3>\n        <p class=\"sa-faq-a\">Because both pieces have a band, and a slot drawn at the nominal has no room for it. Add clearance, or agree a tighter sheet.<\/p>\n      <\/div>\n      <div class=\"sa-faq-item\">\n        <h3 class=\"sa-faq-q\">Does a tighter tolerance mean better acrylic?<\/h3>\n        <p class=\"sa-faq-a\">It means a tighter thickness band. Cast is still the usual sheet for a polished edge and a clear joint. Tolerance and route solve different problems.<\/p>\n      <\/div>\n      <div class=\"sa-faq-item\">\n        <h3 class=\"sa-faq-q\">Can I hold a press fit in cast?<\/h3>\n        <p class=\"sa-faq-a\">Only if you design for the cast band, or you buy selected sheet to an agreed range. The nominal will not do it.<\/p>\n      <\/div>\n      <div class=\"sa-faq-item\">\n        <h3 class=\"sa-faq-q\">What if the part is thicker than the standard covers?<\/h3>\n        <p class=\"sa-faq-a\">The ISO figures above stop at 25 mm cast and 20 mm extruded. Outside that, the tolerance is whatever the parties agree. Write it down.<\/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. The numbers above are the ISO sheet limits, cited with their scope. They are not a measured tolerance for any one order. 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>Thickness bands below are taken from the sheet standards, including the thickness and area limits in those clauses. A mill\u2019s own sheet can differ.<\/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>. Thickness tolerance \u00b1(0.4 + 0.1 h) mm for 1.5\u201325 mm sheet up to 6 m\u00b2. <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>. Thickness tolerance \u00b110% (1.5 mm to under 3 mm) and \u00b15% (3\u201320 mm). <a href=\"https:\/\/www.iso.org\/standard\/28757.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\": \"Acrylic Thickness Tolerance: Cast vs Extruded\",\n      \"description\": \"Cast acrylic has the wider ISO thickness band. Extruded is tighter. 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A named mill can be tighter if the quote says so.\"}\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"Is cast acrylic always plus or minus 10 percent?\",\n          \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No. ISO 7823-1 states plus or minus (0.4 mm + 0.1 times nominal thickness) for 1.5\u201325 mm sheet up to 6 m\u00b2.\"}\n        }\n      ]\n    }\n  ]\n}\n<\/script>\n","protected":false},"excerpt":{"rendered":"<p>Specification guide Thickness tolerance By David Deng \u00b7 R&#038;D manager, Sanait \u00b7 Updated November 2026 A nominal thickness is a name, not a measured wall. Cast acrylic is allowed to vary more than extruded acrylic under the ISO sheet standards. That is why a slot designed to a single number binds, and why two \u201c5 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[38],"tags":[],"class_list":["post-25545","post","type-post","status-publish","format-standard","hentry","category-guide"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Cast vs Extruded: Acrylic Thickness Tolerance Guide<\/title>\n<meta name=\"description\" content=\"Cast acrylic has the wider ISO thickness band; extruded is tighter. 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