{"id":25536,"date":"2026-11-07T19:43:37","date_gmt":"2026-11-07T11:43:37","guid":{"rendered":"https:\/\/www.sanait.com\/?p=25536"},"modified":"2026-11-07T19:44:04","modified_gmt":"2026-11-07T11:44:04","slug":"cast-or-extruded-laser-cut-edges","status":"publish","type":"post","link":"https:\/\/www.sanait.com\/de\/cast-or-extruded-laser-cut-edges\/","title":{"rendered":"Gegossen oder extrudiert f\u00fcr lasergeschnittene Acrylkanten?"},"content":{"rendered":"\n<style>\n\/* Sanait Guide \u2014 Cast Extruded Laser Edges\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  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class=\"sa-kicker\">\n      <span class=\"sa-chip\">Fabrication guide<\/span>\n      <span>Laser-cut edges<\/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\">Laser cutting does not leave the same edge on cast and extruded acrylic. Cast is the sheet whose cut edge can be polished into a show edge. Extruded is the sheet whose cut edge is usually left frosted, or polished only if that member is not the look. Choose the route from the edge the customer will see, not from the word \u201claser.\u201d<\/p>\n\n    <aside class=\"sa-takeaway\" aria-label=\"Key takeaways\">\n      <h2>Key takeaways<\/h2>\n      <ul>\n        <li>A laser-cut edge is a process result. Cast and extruded do not produce the same one.<\/li>\n        <li>Cast is the usual sheet when that edge will be polished and faced to the customer.<\/li>\n        <li>Extruded laser edges are typically frosted. Fine for a hidden member. Not a silent stand-in for a cast polished edge.<\/li>\n        <li>Flame polish and diamond polish are different finishes. Name which one.<\/li>\n        <li>\u201cLaser-cut acrylic\u201d on a quote does not state the route or the edge.<\/li>\n        <li>Do not publish a gloss or clarity number for a cut edge without the sheet and the finish method.<\/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-laser-does\">What the laser actually leaves<\/a><\/li>\n        <li><a href=\"#compare\">Cast edge vs extruded edge<\/a><\/li>\n        <li><a href=\"#polish\">Polish after the cut<\/a><\/li>\n        <li><a href=\"#choose\">Which sheet for which edge<\/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 the laser-cut edge faces the customer and should read as clear, start with cell-cast acrylic and name the polish. If the edge is hidden, or a frosted cut is acceptable, extruded acrylic is usually enough. The laser is the cutting method. It is not the specification.<\/p>\n    <\/div>\n\n    <h2 id=\"what-laser-does\">What the laser actually leaves<\/h2>\n\n    <p>A CO<sub>2<\/sub> laser cuts acrylic by melting and vaporizing a kerf. The edge you get depends on the sheet route, the thickness, the speed, and whether anyone polishes it afterward. \u201cLaser-cut\u201d only means the outline was cut that way. It does not mean the edge is glossy, square, or ready for a show face.<\/p>\n\n    <p>Cast sheet \u2014 the process in ISO 7823-1 \u2014 is what display shops cut when the edge will be finished. Extruded sheet \u2014 ISO 7823-2 \u2014 cuts cleanly as an outline and typically leaves a frosted edge. That frost is normal. It is not a failed cut.<\/p>\n\n    <h2 id=\"compare\">Cast edge vs extruded edge<\/h2>\n\n    <p>Directional. Machine settings and thickness move the result. This is not a lab table.<\/p>\n\n    <div class=\"sa-table-wrap\">\n      <table>\n        <caption>Laser-cut edges \u2014 what a buyer usually sees<\/caption>\n        <thead>\n          <tr>\n            <th scope=\"col\"><\/th>\n            <th scope=\"col\">Cell-cast<\/th>\n            <th scope=\"col\">Extruded<\/th>\n          <\/tr>\n        <\/thead>\n        <tbody>\n          <tr>\n            <th scope=\"row\">Edge as cut<\/th>\n            <td>Can come off the laser closer to a finishable edge<\/td>\n            <td>Typically frosted<\/td>\n          <\/tr>\n          <tr>\n            <th scope=\"row\">After polish<\/th>\n            <td>The usual clear show edge on a cube<\/td>\n            <td>Can be improved; still not the same as cast<\/td>\n          <\/tr>\n          <tr>\n            <th scope=\"row\">Best role<\/th>\n            <td>Customer-facing outline, polished<\/td>\n            <td>Hidden outline, or an edge that may stay matte<\/td>\n          <\/tr>\n          <tr>\n            <th scope=\"row\">What a photo hides<\/th>\n            <td>Whether the polish was flame or diamond<\/td>\n            <td>Whether anyone polished it at all<\/td>\n          <\/tr>\n        <\/tbody>\n      <\/table>\n    <\/div>\n\n    <p>Do not write \u201cglass-like laser edge\u201d into a purchase order. Without the route and the polish method, that phrase describes a hope.<\/p>\n\n    <h2 id=\"polish\">Polish after the cut<\/h2>\n\n    <p>The cut and the finish are two steps.<\/p>\n    <ul>\n      <li><strong>As-cut.<\/strong> Acceptable on a hidden edge, a jig, or a part no one handles as a jewel face.<\/li>\n      <li><strong>Flame polish.<\/strong> Faster. It clears a cast edge for many retail parts. It is not the same as a diamond polish, and it can round a sharp detail.<\/li>\n      <li><strong>Diamond or mechanical polish.<\/strong> The clearer, more controlled show edge. More time. The finish to name when the edge is the product.<\/li>\n    <\/ul>\n\n    <p>Specifying flame on an extruded edge, or diamond on a member that is hidden, is how the edge cost and the edge result get out of line. Match the finish to the route and to who sees it.<\/p>\n\n    <h2 id=\"choose\">Which sheet for which edge<\/h2>\n\n    <div class=\"sa-grid sa-grid-2\">\n      <div class=\"sa-card\">\n        <h3>Polished cube or lid rim<\/h3>\n        <p>Cast, then a named polish. This is the edge the brand is paying for.<\/p>\n      <\/div>\n      <div class=\"sa-card\">\n        <h3>Internal divider<\/h3>\n        <p>Extruded, as-cut or lightly finished. The edge is not the camera face.<\/p>\n      <\/div>\n      <div class=\"sa-card\">\n        <h3>Flat sign with a visible outline<\/h3>\n        <p>Cast if the outline must read clear. Extruded if a frosted outline is acceptable and cost matters.<\/p>\n      <\/div>\n      <div class=\"sa-card\">\n        <h3>Slotted part<\/h3>\n        <p>Extruded helps the fit. If that same edge is also a show edge, you are in a compromise \u2014 say which matters.<\/p>\n      <\/div>\n    <\/div>\n\n    <p>Parts where the edge is the decision: <a href=\"https:\/\/www.sanait.com\/custom-acrylic-boxes\/\">boxes<\/a>, <a href=\"https:\/\/www.sanait.com\/custom-acrylic-trays\/\">trays<\/a>, and <a href=\"https:\/\/www.sanait.com\/\">display stands<\/a>.<\/p>\n\n    <h2 id=\"specify\">What to write on the RFQ<\/h2>\n\n    <ol>\n      <li>PMMA, cast or extruded, on the members that are laser-cut.<\/li>\n      <li>Edge condition: as-cut, flame polished, or diamond polished \u2014 and on which edges.<\/li>\n      <li>Which edges face the customer.<\/li>\n      <li>That a frosted extruded edge is accepted, if it is.<\/li>\n    <\/ol>\n\n    <p>A quote that says only \u201claser-cut acrylic\u201d has not answered this page. Ask before you compare price.<\/p>\n\n    <p>Sanait fabricates acrylic displays and treats the edge as part of the brief. How a brief is taken 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\">Should laser-cut display edges be cast or extruded?<\/h3>\n        <p class=\"sa-faq-a\">Cast if the edge faces the customer and should be clear. Extruded if the edge is hidden or a frosted cut is acceptable.<\/p>\n      <\/div>\n      <div class=\"sa-faq-item\">\n        <h3 class=\"sa-faq-q\">Why is my extruded laser edge cloudy?<\/h3>\n        <p class=\"sa-faq-a\">That is the normal as-cut result on extruded sheet. It is not, by itself, a bad cut. A clear edge on that member means a polish, or a move to cast.<\/p>\n      <\/div>\n      <div class=\"sa-faq-item\">\n        <h3 class=\"sa-faq-q\">Does laser cutting polish the edge?<\/h3>\n        <p class=\"sa-faq-a\">No. The laser cuts. Polish is a later step, and flame and diamond are different steps.<\/p>\n      <\/div>\n      <div class=\"sa-faq-item\">\n        <h3 class=\"sa-faq-q\">Can I polish an extruded laser edge until it matches cast?<\/h3>\n        <p class=\"sa-faq-a\">You can improve it. You should not expect the same show edge as polished cast. If the match matters, specify cast on that member.<\/p>\n      <\/div>\n      <div class=\"sa-faq-item\">\n        <h3 class=\"sa-faq-q\">Is a frosted edge a defect?<\/h3>\n        <p class=\"sa-faq-a\">Only if the drawing asked for a polished or clear edge. On a hidden extruded member it is the expected condition.<\/p>\n      <\/div>\n      <div class=\"sa-faq-item\">\n        <h3 class=\"sa-faq-q\">What if two quotes both say laser-cut?<\/h3>\n        <p class=\"sa-faq-a\">Align route and edge finish before you read the price. One may be extruded as-cut. The other may be cast and diamond polished.<\/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 edge note is general fabrication practice. 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 two sheet routes are defined by the standards below. They do not define a laser-edge gloss value.<\/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\/33451.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\": \"Cast or Extruded for Laser-Cut Acrylic Edges?\",\n      \"description\": \"Cast for a laser-cut edge that will be polished and seen. 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Extruded is the sheet whose cut edge is usually left frosted, or polished [&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-25536","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 or Extruded for Laser-Cut Acrylic Edges?<\/title>\n<meta name=\"description\" content=\"Use cast acrylic when a laser-cut edge will be polished and seen. Extruded is enough if a frosted cut is acceptable. Name the polish, not just the laser.\" \/>\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\/de\/cast-or-extruded-laser-cut-edges\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cast or Extruded for Laser-Cut Acrylic Edges?\" \/>\n<meta property=\"og:description\" content=\"Use cast acrylic when a laser-cut edge will be polished and seen. Extruded is enough if a frosted cut is acceptable. 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