{"id":1307,"date":"2026-09-16T14:36:18","date_gmt":"2026-09-16T14:36:18","guid":{"rendered":"https:\/\/www.mdi-ap.com\/glass-edge-strength\/"},"modified":"2026-09-21T12:14:20","modified_gmt":"2026-09-21T12:14:20","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 .container{max-width:none!important;padding:0!important;}\n.ip-bleed{margin-left:calc(50% - 50vw);margin-right:calc(50% - 50vw);width:100vw;}\n.ip-wrap{max-width:1160px;margin:0 auto;padding:0 24px;}\n.ip-eyebrow{font-size:12px;font-weight:800;letter-spacing:.16em;text-transform:uppercase;color:var(--red);}\n.ip-eyebrow.on-dark{color:var(--red-lt);}\n.ip-h2{font-size:clamp(24px,3.2vw,38px);line-height:1.14;letter-spacing:-.02em;margin:8px 0 12px;font-weight:800;}\n.ip-sub{color:var(--muted);max-width:62ch;margin:0 0 30px;font-size:17px;}\n.ip-btn{display:inline-flex;align-items:center;gap:8px;font-weight:700;font-size:15px;padding:14px 26px;border-radius:10px;text-decoration:none;transition:transform .18s,box-shadow .18s,background .18s,color .18s;}\n.ip-btn.solid{background:var(--red);color:#fff;box-shadow:0 10px 24px rgba(128,38,47,.34);}\n.ip-btn.solid:hover{transform:translateY(-2px);background:var(--red2);color:#fff;}\n.ip-btn.ghost{background:transparent;color:#fff;border:1.6px solid rgba(255,255,255,.55);}\n.ip-btn.ghost:hover{background:#fff;color:var(--navy);}\n.ip-reveal{opacity:0;transform:translateY(24px);transition:opacity .7s ease,transform .7s ease;}\n.ip-reveal.ip-in{opacity:1;transform:none;}\n\/* HERO *\/\n.ip-hero{position:relative;background:var(--navy);overflow:hidden;min-height:56vh;display:flex;align-items:center;}\n.ip-hero .bg{position:absolute;inset:0;background-size:cover;background-position:center;opacity:.30;z-index:0;}\n.ip-hero video.bg{width:100%;height:100%;object-fit:cover;opacity:.75;}\n.ip-hero::after{content:\"\";position:absolute;inset:0;z-index:1;background:linear-gradient(100deg,rgba(2,20,38,.88) 0%,rgba(2,20,38,.48) 46%,rgba(2,20,38,.06) 100%);}\n.ip-hero-in{position:relative;z-index:2;color:#fff;padding:120px 0 74px;max-width:820px;padding-left:clamp(24px,7vw,120px);padding-right:24px;}\n.ip-hero h1{font-size:clamp(30px,4.4vw,52px);line-height:1.07;letter-spacing:-.02em;font-weight:800;margin:14px 0 16px;}\n.ip-hero p{font-size:clamp(16px,1.5vw,20px);color:rgba(255,255,255,.85);max-width:52ch;margin:0 0 28px;}\n.ip-crumb{font-size:12.5px;color:rgba(255,255,255,.6);letter-spacing:.04em;}\n.ip-crumb b{color:#fff;}\n\/* DRAFT banner *\/\n.ip-draft{background:#fff7e6;border-bottom:1px solid #f0d9a0;color:#8a6d1f;font-size:13.5px;font-weight:600;text-align:center;padding:10px 16px;}\n\/* SECTIONS *\/\n.ip-section{padding:76px 0;}\n.ip-section.paper{background:var(--paper);}\n.ip-head{max-width:720px;margin-bottom:34px;}\n.ip-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:18px;}\n.ip-card{position:relative;display:flex;flex-direction:column;background:#fff;border:1px solid var(--line);border-radius:16px;padding:24px 22px;text-decoration:none;color:inherit;transition:transform .2s,box-shadow .2s,border-color .2s;}\n.ip-card .ic{width:46px;height:46px;border-radius:12px;display:flex;align-items:center;justify-content:center;background:var(--paper);color:var(--navy);margin-bottom:16px;transition:background .2s,color .2s;}\n.ip-card .ic svg{width:24px;height:24px;}\n.ip-card h3{margin:0 0 6px;font-size:17px;font-weight:700;}\n.ip-card p{margin:0;font-size:14px;color:var(--muted);line-height:1.5;}\na.ip-card:hover{transform:translateY(-6px);box-shadow:0 20px 40px rgba(20,22,26,.13);border-color:transparent;}\na.ip-card:hover .ic{background:var(--red);color:#fff;}\n.ip-cardlink{margin-top:14px;font-size:13.5px;font-weight:700;color:var(--red);}\n.ip-cardlink::after{content:\" \u2192\";}\n\/* SPECS dark *\/\n.ip-specs{background:linear-gradient(160deg,#02203c,#0b3157);color:#fff;}\n.ip-specs-in{padding:60px 0;}\n.ip-specgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:14px;}\n.ip-spec{text-align:center;padding:22px 14px;border-radius:16px;background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.09);}\n.ip-spec b{display:block;font-size:clamp(22px,2.6vw,32px);font-weight:800;letter-spacing:-.01em;line-height:1.1;}\n.ip-spec b .u{color:var(--red-lt);}\n.ip-spec span{display:block;margin-top:9px;font-size:12.5px;color:rgba(255,255,255,.62);}\n\/* EXAMPLE *\/\n.ip-two{display:grid;grid-template-columns:1fr 1fr;gap:34px;align-items:center;}\n.ip-two .ph img{width:100%;border-radius:16px;display:block;}\n.ip-two h2{font-size:24px;margin:0 0 12px;font-weight:800;}\n.ip-two p{color:var(--muted);}\n\/* BAND *\/\n.ip-band{position:relative;color:#fff;overflow:hidden;background:radial-gradient(1200px 500px at 15% 0%,#9c2f38 0%,transparent 55%),linear-gradient(120deg,#5f1c23,#80262f 55%,#4d161c);}\n.ip-band-in{padding:70px 0;text-align:center;position:relative;z-index:1;}\n.ip-band h2{font-size:clamp(24px,3.2vw,38px);font-weight:800;margin:0 auto 12px;max-width:22ch;}\n.ip-band p{color:rgba(255,255,255,.9);max-width:620px;margin:0 auto 24px;font-size:16.5px;}\n.ip-band .ip-btn.solid{background:#fff;color:var(--red);}\n.ip-band .ip-btn.solid:hover{background:#fff;color:#4d161c;}\n.ip-band::before{content:\"\";position:absolute;inset:0;opacity:.08;background-image:radial-gradient(circle at 1px 1px,#fff 1px,transparent 0);background-size:26px 26px;}\n\/* POSTS *\/\n.ip-postgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:20px;}\n.ip-pcard{display:flex;flex-direction:column;border-radius:16px;overflow:hidden;background:#fff;border:1px solid var(--line);text-decoration:none;color:inherit;transition:transform .2s,box-shadow .2s;}\n.ip-pcard:hover{transform:translateY(-6px);box-shadow:0 22px 44px rgba(20,22,26,.14);}\n.ip-pcard .ph{aspect-ratio:16\/10;overflow:hidden;background:#eceef1;}\n.ip-pcard .ph img{width:100%;height:100%;object-fit:cover;transition:transform .5s;}\n.ip-pcard:hover .ph img{transform:scale(1.07);}\n.ip-pcard .pb{padding:18px 20px 22px;}\n.ip-pcard .pt{font-size:11px;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:var(--red);margin-bottom:8px;}\n.ip-pcard h3{font-size:16px;font-weight:700;line-height:1.35;margin:0;}\n.ip-note{background:var(--paper);border:1px dashed var(--line);border-radius:14px;padding:22px 24px;color:var(--muted);font-size:14.5px;}\n.ip-close{text-align:center;padding:74px 0;background:var(--paper);}\n.ip-close h2{font-size:clamp(22px,2.8vw,34px);font-weight:800;margin:0 auto 20px;max-width:24ch;}\n.ip-btn.outline-red{background:transparent;color:var(--red);border:1.6px solid var(--red);}\n.ip-btn.outline-red:hover{background:var(--red);color:#fff;}\n@media(max-width:760px){.ip-two{grid-template-columns:1fr;}.ip-section{padding:56px 0;}}\n\/* deep content *\/\n.ip-check{list-style:none;margin:18px 0 0;padding:0;display:grid;gap:10px;}\n.ip-check li{position:relative;padding-left:32px;font-size:15.5px;line-height:1.5;}\n.ip-check 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=\"https:\/\/www.mdi-ap.com\/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=\"https:\/\/www.mdi-ap.com\/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=\"https:\/\/www.mdi-ap.com\/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=\"https:\/\/www.mdi-ap.com\/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=\"https:\/\/www.mdi-ap.com\/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=\"https:\/\/www.mdi-ap.com\/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=\"https:\/\/www.mdi-ap.com\/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=\"https:\/\/www.mdi-ap.com\/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<p><script type=\"application\/ld+json\">{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Why does glass almost always break at the edge?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The surface of glass is extremely strong \u2014 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.\"}}, {\"@type\": \"Question\", \"name\": \"What makes the laser-cut edge stronger?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The CO2 laser cut is contactless: a guided thermal crack separates the glass without mechanical load. No micro-cracks, no chipping \u2014 the result is optical glass edge quality straight from the cutting step, proven in 4-point bending tests.\"}}, {\"@type\": \"Question\", \"name\": \"What does &ldquo;&gt;200 MPa edge strength&rdquo; mean?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"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 \u2014 decisive for tempering, assembly and flexible applications.\"}}, {\"@type\": \"Question\", \"name\": \"Does a good edge need grinding?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Not with the CO2 laser cut \u2014 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.\"}}, {\"@type\": \"Question\", \"name\": \"How do you verify edge strength?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"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.\"}}, {\"@type\": \"Question\", \"name\": \"Does this apply to ultra-thin glass as well?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes \u2014 there the edge is everything. With SOLID-D\u00ae, edges of 10\u2013100 \u00b5m glass reach mirror quality without particles or micro-cracks; combined with resin lamination, bend radii down to r &asymp; 1.5 mm become possible.\"}}]}<\/script><\/p>\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 v28.6 - 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. 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.\" \/>\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.mdi-ap.com\/en\/glass-edge-strength\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Glass Edge Strength \u2014 &gt;200 MPa, No Micro-Cracks | MDI\" \/>\n<meta property=\"og:description\" content=\"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.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.mdi-ap.com\/en\/glass-edge-strength\/\" \/>\n<meta property=\"og:site_name\" content=\"MDI Advanced Processing GmbH\" \/>\n<meta property=\"article:modified_time\" content=\"2026-09-21T12:14:20+00:00\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.mdi-ap.com\\\/en\\\/glass-edge-strength\\\/\",\"url\":\"https:\\\/\\\/www.mdi-ap.com\\\/en\\\/glass-edge-strength\\\/\",\"name\":\"Glass Edge Strength \u2014 >200 MPa, No Micro-Cracks | MDI\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.mdi-ap.com\\\/en\\\/#website\"},\"datePublished\":\"2026-09-16T14:36:18+00:00\",\"dateModified\":\"2026-09-21T12:14:20+00:00\",\"description\":\"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.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.mdi-ap.com\\\/en\\\/glass-edge-strength\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.mdi-ap.com\\\/en\\\/glass-edge-strength\\\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.mdi-ap.com\\\/en\\\/glass-edge-strength\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.mdi-ap.com\\\/en\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Edge Strength &#038; Edge Quality\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.mdi-ap.com\\\/en\\\/#website\",\"url\":\"https:\\\/\\\/www.mdi-ap.com\\\/en\\\/\",\"name\":\"MDI Advanced Processing GmbH\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.mdi-ap.com\\\/en\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Glass Edge Strength \u2014 >200 MPa, No Micro-Cracks | MDI","description":"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.","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.mdi-ap.com\/en\/glass-edge-strength\/","og_locale":"en_US","og_type":"article","og_title":"Glass Edge Strength \u2014 >200 MPa, No Micro-Cracks | MDI","og_description":"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.","og_url":"https:\/\/www.mdi-ap.com\/en\/glass-edge-strength\/","og_site_name":"MDI Advanced Processing GmbH","article_modified_time":"2026-09-21T12:14:20+00:00","twitter_card":"summary_large_image","twitter_misc":{"Est. reading time":"3 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.mdi-ap.com\/en\/glass-edge-strength\/","url":"https:\/\/www.mdi-ap.com\/en\/glass-edge-strength\/","name":"Glass Edge Strength \u2014 >200 MPa, No Micro-Cracks | MDI","isPartOf":{"@id":"https:\/\/www.mdi-ap.com\/en\/#website"},"datePublished":"2026-09-16T14:36:18+00:00","dateModified":"2026-09-21T12:14:20+00:00","description":"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.","breadcrumb":{"@id":"https:\/\/www.mdi-ap.com\/en\/glass-edge-strength\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.mdi-ap.com\/en\/glass-edge-strength\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.mdi-ap.com\/en\/glass-edge-strength\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.mdi-ap.com\/en\/"},{"@type":"ListItem","position":2,"name":"Edge Strength &#038; Edge Quality"}]},{"@type":"WebSite","@id":"https:\/\/www.mdi-ap.com\/en\/#website","url":"https:\/\/www.mdi-ap.com\/en\/","name":"MDI Advanced Processing GmbH","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.mdi-ap.com\/en\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"}]}},"_links":{"self":[{"href":"https:\/\/www.mdi-ap.com\/en\/wp-json\/wp\/v2\/pages\/1307","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.mdi-ap.com\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.mdi-ap.com\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.mdi-ap.com\/en\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/www.mdi-ap.com\/en\/wp-json\/wp\/v2\/comments?post=1307"}],"version-history":[{"count":1,"href":"https:\/\/www.mdi-ap.com\/en\/wp-json\/wp\/v2\/pages\/1307\/revisions"}],"predecessor-version":[{"id":1346,"href":"https:\/\/www.mdi-ap.com\/en\/wp-json\/wp\/v2\/pages\/1307\/revisions\/1346"}],"wp:attachment":[{"href":"https:\/\/www.mdi-ap.com\/en\/wp-json\/wp\/v2\/media?parent=1307"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}