{"id":1307,"date":"2026-09-16T14:36:19","date_gmt":"2026-09-16T14:36:19","guid":{"rendered":"https:\/\/www.mdi-ap.com\/glass-edge-strength\/"},"modified":"2026-09-16T14:36:19","modified_gmt":"2026-09-16T14:36:19","slug":"glass-edge-strength","status":"publish","type":"page","link":"https:\/\/www.mdi-ap.com\/en\/glass-edge-strength\/","title":{"rendered":"Edge Strength &#038; Edge Quality"},"content":{"rendered":"<div class=\"ip\">\n<style>\n.ip{--navy:#02203c;--navy2:#0b3157;--red:#80262f;--red2:#ad0c26;--red-lt:#e2564f;--blue:#5897fb;--ink:#02203c;--muted:#5e6467;--line:#e2e5ea;--paper:#f5f7f9;\n color:var(--ink);font-family:\"Source Sans Pro\",\"Segoe UI\",-apple-system,Roboto,Arial,sans-serif;font-size:16px;line-height:1.6;overflow-x:clip;}\n.ip *{box-sizing:border-box;}\n.ip img{max-width:100%;}\n.ip h1,.ip h2,.ip h3,.ip h4{color:inherit;font-family:inherit;}\n.middle-section{padding:0!important;}\n.middle-section 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li::before{content:\"\\2713\";position:absolute;left:0;top:1px;width:21px;height:21px;border-radius:7px;background:rgba(128,38,47,.10);color:var(--red);font-weight:800;font-size:12px;display:flex;align-items:center;justify-content:center;}\n.ip-adv h3{margin:0 0 6px;font-size:16.5px;}\n.ip-tablewrap{overflow-x:auto;margin-top:26px;border:1px solid var(--line);border-radius:14px;}\n.ip-table{width:100%;border-collapse:collapse;background:#fff;font-size:15px;min-width:560px;}\n.ip-table th{background:var(--navy);color:#fff;text-align:left;padding:13px 18px;font-size:12.5px;letter-spacing:.07em;text-transform:uppercase;}\n.ip-table td{padding:12px 18px;border-top:1px solid var(--line);}\n.ip-table tr.hl td{background:#fdf3f4;font-weight:700;color:var(--red);}\n.ip-faq{max-width:880px;}\n.ip-faq details{background:#fff;border:1px solid var(--line);border-radius:14px;margin-bottom:12px;}\n.ip-faq summary{cursor:pointer;font-weight:700;font-size:16px;padding:18px 48px 18px 22px;list-style:none;position:relative;}\n.ip-faq summary::-webkit-details-marker{display:none;}\n.ip-faq summary::after{content:\"+\";position:absolute;right:20px;top:14px;font-size:22px;color:var(--red);font-weight:400;}\n.ip-faq details[open] summary::after{content:\"\\2013\";}\n.ip-faq .a{padding:0 22px 20px;color:var(--muted);font-size:15px;line-height:1.65;}\n.ip-faq .a ul{margin:10px 0 0;padding-left:20px;}\n.ip-faq .a p{margin:0 0 10px;}\n.ip-people{display:flex;gap:18px;justify-content:center;flex-wrap:wrap;margin:8px 0 26px;}\n.ip-person{display:flex;align-items:center;gap:14px;background:#fff;border:1px solid var(--line);border-radius:14px;padding:14px 20px;text-align:left;}\n.ip-person img{width:56px;height:56px;border-radius:50%;object-fit:cover;}\n.ip-person b{display:block;font-size:15px;}\n.ip-person span{font-size:13px;color:var(--muted);display:block;}\n.ip-person a{color:var(--red);font-size:13px;text-decoration:none;font-weight:600;}\n.ip-video{position:relative;padding-top:56.25%;border-radius:16px;overflow:hidden;box-shadow:0 22px 46px rgba(2,20,38,.20);background:#000;}\n.ip-video iframe{position:absolute;inset:0;width:100%;height:100%;border:0;}<\/p>\n<p>\/* jobshop form *\/\n.ip-form{background:#fff;border:1px solid var(--line);border-radius:18px;padding:34px clamp(20px,4vw,44px);max-width:860px;}\n.ip-form input[type=text],.ip-form input[type=email],.ip-form input[type=tel],.ip-form textarea{width:100%;border:1px solid var(--line);border-radius:10px;padding:12px 14px;font:inherit;font-size:15px;background:var(--paper);margin:6px 0 14px;}\n.ip-form textarea{min-height:120px;}\n.ip-form input[type=submit],.ip-form .wpcf7-submit{background:var(--red);color:#fff;font-weight:700;font-size:15px;padding:14px 28px;border:0;border-radius:10px;cursor:pointer;}\n.ip-form input[type=submit]:hover{background:var(--red2);}\n.ip-step{position:relative;background:#fff;border:1px solid var(--line);border-radius:16px;padding:26px 24px 24px;}\n.ip-step .n{font-size:13px;font-weight:800;letter-spacing:.1em;color:var(--red);}\n.ip-step h3{margin:8px 0 6px;font-size:17px;}\n.ip-step p{margin:0;font-size:14.5px;color:var(--muted);}\n<\/style>\n<section class=\"ip-hero ip-bleed\">\n<div class=\"ip-hero-in\">\n<div class=\"ip-crumb\">Home &rsaquo; Technologies &rsaquo; <b>Edge quality<\/b><\/div>\n<div class=\"ip-eyebrow on-dark\" style=\"margin-top:14px;\">Application \u00b7 Edge quality<\/div>\n<h1>Glass Edge Strength &amp; Edge Quality<\/h1>\n<p>The edge decides whether glass breaks &mdash; in tempering, in handling, under bending load. This is how edges without micro-cracks are made.<\/p>\n<p>  <a class=\"ip-btn solid\" href=\"\/en\/prototyping\/\">Request sample parts &rarr;<\/a>\n <\/div>\n<\/section>\n<section class=\"ip-section\" style=\"padding:64px 0;\">\n<div class=\"ip-wrap\">\n<div class=\"ip-two\" style=\"align-items:start;gap:44px;\">\n<div class=\"ip-reveal\">\n<div class=\"ip-eyebrow\">Why it matters<\/div>\n<h2 class=\"ip-h2\" style=\"margin-bottom:10px;\">The edge decides between breaking and lasting<\/h2>\n<\/p><\/div>\n<div class=\"ip-reveal\">\n<p style=\"margin:0 0 14px;\">Glass almost never fails in the surface &mdash; it fails at the edge. Micro-cracks and chipping from the cutting process act as predetermined breaking points: in thermal tempering, in transport or under bending load, fracture starts exactly there. The cleaner the edge, the stronger the whole part.<\/p>\n<p style=\"margin:0;\">That is why we judge every process by the edge it leaves behind &mdash; and verify it in-house with 3- and 4-point bending tests up to 10 kN.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n<section class=\"ip-section paper\">\n<div class=\"ip-wrap\">\n<div class=\"ip-head ip-reveal\" style=\"text-align:center;max-width:none;\">\n<div class=\"ip-eyebrow\">The proof<\/div>\n<h2 class=\"ip-h2\">4-point bend test: wheel vs. CO2 laser<\/h2>\n<p class=\"ip-sub\" style=\"margin-left:auto;margin-right:auto;\">Watch the direct comparison of how much more load the laser-cut edge carries before it breaks.<\/p>\n<\/div>\n<div class=\"ip-video ip-reveal\" style=\"max-width:860px;padding-top:42%;margin:0 auto;\"><iframe src=\"https:\/\/www.youtube.com\/embed\/3tccFU0-Mhc\" title=\"4-point bend test: wheel-cut vs. CO2 laser-cut glass\" loading=\"lazy\" allowfullscreen allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\"><\/iframe><\/div>\n<\/p><\/div>\n<\/section>\n<section class=\"ip-specs ip-bleed\">\n<div class=\"ip-specs-in ip-wrap\">\n<div class=\"ip-head ip-reveal\" style=\"margin-bottom:24px;\">\n<div class=\"ip-eyebrow on-dark\">Key figures<\/div>\n<h2 class=\"ip-h2\" style=\"color:#fff;\">What good edges deliver<\/h2>\n<\/div>\n<div class=\"ip-specgrid ip-reveal\">\n<div class=\"ip-spec\"><b>&gt;200<span class='u'> MPa<\/span><\/b><span>bending strength after cutting (depending on glass thickness)<\/span><\/div>\n<div class=\"ip-spec\"><b>0<\/b><span>grinding or washing steps &mdash; the cut edge is the finished edge<\/span><\/div>\n<div class=\"ip-spec\"><b>90<span class='u'>%<\/span><\/b><span>median crack depth on glass up to 2 mm (Penett&reg;)<\/span><\/div>\n<div class=\"ip-spec\"><b>Mirror quality<\/b><span>edges without particles or micro-cracks (SOLID-D&reg;)<\/span><\/div>\n<\/div><\/div>\n<\/section>\n<section class=\"ip-section\">\n<div class=\"ip-wrap\">\n<div class=\"ip-head ip-reveal\">\n<div class=\"ip-eyebrow\">Three ways<\/div>\n<h2 class=\"ip-h2\">Three processes, one goal: the strong edge<\/h2>\n<p class=\"ip-sub\">Which route is right depends on glass thickness, geometry and volume &mdash; we choose it with you.<\/p>\n<\/div>\n<div class=\"ip-grid\" style=\"grid-template-columns:repeat(auto-fit,minmax(300px,1fr));\">\n   <a class=\"ip-card ip-reveal\" href=\"\/en\/co2-laser\/\"><\/p>\n<h3>CO2 laser: thermal cutting<\/h3>\n<p>The guided thermal crack creates an optical glass edge without micro-cracks &mdash; with zero post-processing. For straight cuts from 0.1 to 3 mm.<\/p>\n<p><span class=\"ip-cardlink\">View the CO2 laser<\/span><\/a><br \/>\n<a class=\"ip-card ip-reveal\" href=\"\/en\/thin-glass\/\"><\/p>\n<h3>SOLID-D&reg; for ultra-thin glass<\/h3>\n<p>Mirror-fine edges without particles on 10&ndash;100 &micro;m glass &mdash; enabling bend radii down to r &asymp; 1.5 mm on laminated stacks.<\/p>\n<p><span class=\"ip-cardlink\">View thin glass<\/span><\/a><br \/>\n<a class=\"ip-card ip-reveal\" href=\"\/en\/cutting-tools\/\"><\/p>\n<h3>Penett&reg; &amp; APIO&reg; wheels<\/h3>\n<p>The deep median crack (up to 90% of glass thickness) breaks controlled &mdash; clean edges even on coatings and at crossing points.<\/p>\n<p><span class=\"ip-cardlink\">View cutting tools<\/span><\/a>\n  <\/div>\n<\/p><\/div>\n<\/section>\n<section class=\"ip-section paper\">\n<div class=\"ip-wrap\">\n<div class=\"ip-head ip-reveal\">\n<div class=\"ip-eyebrow\">FAQ<\/div>\n<h2 class=\"ip-h2\">Frequently asked questions about edge strength<\/h2>\n<\/div>\n<div class=\"ip-faq\">\n<details class=\"ip-reveal\">\n<summary>Why does glass almost always break at the edge?<\/summary>\n<div class=\"a\">\n<p>The surface of glass is extremely strong &mdash; weaknesses are created during cutting: micro-cracks and chips at the edge act like notches where stress concentrates. Under load (bending, thermal tempering, temperature cycles), fracture starts there.<\/p>\n<\/div>\n<\/details>\n<details class=\"ip-reveal\">\n<summary>What makes the laser-cut edge stronger?<\/summary>\n<div class=\"a\">\n<p>The CO2 laser cut is contactless: a guided thermal crack separates the glass without mechanical load. No micro-cracks, no chipping &mdash; the result is optical glass edge quality straight from the cutting step, proven in 4-point bending tests.<\/p>\n<\/div>\n<\/details>\n<details class=\"ip-reveal\">\n<summary>What does &ldquo;&gt;200 MPa edge strength&rdquo; mean?<\/summary>\n<div class=\"a\">\n<p>The bending strength of the edge after cutting, depending on glass thickness. The higher the value, the more load and deformation the part tolerates before breaking &mdash; decisive for tempering, assembly and flexible applications.<\/p>\n<\/div>\n<\/details>\n<details class=\"ip-reveal\">\n<summary>Does a good edge need grinding?<\/summary>\n<div class=\"a\">\n<p>Not with the CO2 laser cut &mdash; the cut edge is the finished edge, with no grinding, polishing or washing. That saves process steps and avoids the risk of introducing new defects during rework.<\/p>\n<\/div>\n<\/details>\n<details class=\"ip-reveal\">\n<summary>How do you verify edge strength?<\/summary>\n<div class=\"a\">\n<p>In-house with 3- and 4-point bending tests up to a maximum force of 10 kN, complemented by glass analysis and measurement with software-assisted electron microscopes. On request we test your samples and document the results.<\/p>\n<\/div>\n<\/details>\n<details class=\"ip-reveal\">\n<summary>Does this apply to ultra-thin glass as well?<\/summary>\n<div class=\"a\">\n<p>Yes &mdash; there the edge is everything. With SOLID-D&reg;, edges of 10&ndash;100 &micro;m glass reach mirror quality without particles or micro-cracks; combined with resin lamination, bend radii down to r &asymp; 1.5 mm become possible.<\/p>\n<\/div>\n<\/details><\/div>\n<\/p><\/div>\n<\/section>\n<section class=\"ip-section\">\n<div class=\"ip-wrap\">\n<div class=\"ip-head ip-reveal\">\n<div class=\"ip-eyebrow\">Related insights<\/div>\n<h2 class=\"ip-h2\">Edge quality on the blog<\/h2>\n<\/div>\n<div class=\"ip-postgrid\"><a class=\"ip-pcard ip-reveal\" href=\"\/en\/reduce-glass-chipping-guide\/\"><\/p>\n<div class=\"pb\">\n<div class=\"pt\">Edge quality<\/div>\n<h3>How to Reduce Chipping in Glass Cutting<\/h3>\n<\/div>\n<p><\/a><br \/>\n<a class=\"ip-pcard ip-reveal\" href=\"\/en\/notched-glass-cutting-wheels\/\"><\/p>\n<div class=\"pb\">\n<div class=\"pt\">Cutting tools<\/div>\n<h3>Notched Glass Cutting Wheels: Laser-Cut Precision<\/h3>\n<\/div>\n<p><\/a><br \/>\n<a class=\"ip-pcard ip-reveal\" href=\"\/en\/frequently-asked-questions-faq-co2-laser-cutting-of-glass\/\"><\/p>\n<div class=\"pb\">\n<div class=\"pt\">CO2 laser<\/div>\n<h3>FAQ: CO2 laser cutting of glass<\/h3>\n<\/div>\n<p><\/a><\/div>\n<\/p><\/div>\n<\/section>\n<section class=\"ip-close ip-bleed\">\n<div class=\"ip-wrap ip-reveal\">\n<div class=\"ip-eyebrow\">Let&rsquo;s talk<\/div>\n<h2>Edges that have to hold? Put us to the test.<\/h2>\n<div class=\"ip-people\">\n<div class=\"ip-person\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2023\/05\/herrmanns.jpg\" alt=\"Dr. Christoph Hermanns\"><\/p>\n<div><b>Dr. Christoph Hermanns<\/b><span>General Manager<\/span><a href=\"mailto:christoph.hermanns@mdi-ap.com\">christoph.hermanns@mdi-ap.com<\/a><\/div>\n<\/div>\n<div class=\"ip-person\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2023\/05\/unal2.jpg\" alt=\"\u00dcnal Eren\"><\/p>\n<div><b>\u00dcnal Eren<\/b><span>Sales &amp; Marketing<\/span><a href=\"mailto:unal.eren@mdi-ap.com\">unal.eren@mdi-ap.com<\/a><\/div>\n<\/div>\n<\/div>\n<p> <a class=\"ip-btn outline-red\" href=\"\/en\/prototyping\/\">Request sample parts &rarr;<\/a><\/div>\n<\/section>\n<p><script>\n(function(){var r=document.querySelector('.ip');if(!r||!('IntersectionObserver' in window))return;\nvar io=new IntersectionObserver(function(es){es.forEach(function(e){if(e.isIntersecting){e.target.classList.add('ip-in');io.unobserve(e.target);}});},{threshold:.12});\nr.querySelectorAll('.ip-reveal').forEach(function(el,i){el.style.transitionDelay=(Math.min(i,6)*40)+'ms';io.observe(el);});})();\n<\/script><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Home &rsaquo; Technologies &rsaquo; Edge quality Application \u00b7 Edge quality Glass Edge Strength &amp; Edge Quality The edge decides whether glass breaks &mdash; in tempering, in handling, under bending load. This is how edges without micro-cracks are made. Request sample parts &rarr; Why it matters The edge decides between breaking and lasting Glass almost never [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_yoast_wpseo_title":"Glass Edge Strength \u2014 >200 MPa, No Micro-Cracks | MDI","_yoast_wpseo_metadesc":"The edge decides whether glass breaks. CO2 laser, SOLID-D\u00ae and Penett\u00ae\/APIO\u00ae for edges without micro-cracks \u2014 proven in 4-point bend tests, verified up to 10 kN.","inline_featured_image":false,"jobshop_section_title":"","jobshop_section_text":"","jobshop_section_button_label":"","jobshop_section_button_link":"","footnotes":""},"class_list":["post-1307","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Glass Edge Strength \u2014 &gt;200 MPa, No Micro-Cracks | MDI<\/title>\n<meta name=\"description\" content=\"The edge decides whether glass breaks. 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