{"id":2261,"date":"2026-06-03T13:44:46","date_gmt":"2026-06-03T05:44:46","guid":{"rendered":"https:\/\/jeez-semicon.com\/?p=2261"},"modified":"2026-06-03T13:44:46","modified_gmt":"2026-06-03T05:44:46","slug":"polishing-slurry-for-optical-glass-and-lenses","status":"publish","type":"post","link":"https:\/\/jeez-semicon.com\/fr\/blog\/polishing-slurry-for-optical-glass-and-lenses\/","title":{"rendered":"Polishing Slurry for Optical Glass and Lenses"},"content":{"rendered":"<!-- ===== JEEZ \u00b7 Polishing Slurry for Optical Glass and Lenses \u2014 paste into Gutenberg \"Custom HTML\" block ===== -->\n\n<style>\n@import url('https:\/\/fonts.googleapis.com\/css2?family=Sora:wght@500;600;700;800&family=IBM+Plex+Sans:ital,wght@0,400;0,500;0,600;1,400&family=IBM+Plex+Mono:wght@500;600&display=swap');\n.jz-d1-wrap{\n  --ink:#0a1f33; --navy:#0d2a44; --navy2:#123a5c;\n  --acc:#178f79; --accd:#116b5c; --accl:#e3f4f0;\n  --text:#1c2b3a; --muted:#5a6b7b; --line:#e1e8ef; --bg:#f6f9fb; --card:#fff;\n 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.ps-btn:hover{filter:brightness(1.1);color:#04222e;transform:translateY(-2px);border:none;}\n.jz-d1-wrap .ps-btn span{font-family:'IBM Plex Mono',monospace;}\n.jz-d1-wrap .ps-signoff{font-size:14px;color:var(--muted);border-top:1px solid var(--line);padding-top:20px;margin-top:38px;font-style:italic;}\n@media(max-width:760px){\n  .jz-d1-wrap{font-size:16px;}\n  .jz-d1-wrap .ps-hero{padding:40px 24px 36px;}\n  .jz-d1-wrap .ps-toc{padding:22px 20px;}\n  .jz-d1-wrap .ps-toc ol{grid-template-columns:1fr;gap:0;}\n  .jz-d1-wrap .ps-cards{grid-template-columns:1fr;}\n  .jz-d1-wrap .ps-cta{padding:34px 24px;}\n}\n<\/style>\n\n<div class=\"jz-d1-wrap\">\n  <header class=\"ps-hero\">\n    <div class=\"ps-eyebrow\">JEEZ \u00b7 Applications<\/div>\n    \n    <p class=\"ps-lead\">Precision optics demand surfaces measured in nanometres of roughness and fractions of a wavelength of figure. This guide explains how polishing slurry works for optical glass and lenses \u2014 the abrasive chemistry, the polishing stages, the quality targets and how to choose a slurry.<\/p>\n    <div class=\"ps-meta\"><span>By <b>JEEZ \u2014 Jizhi Electronic Technology Co., Ltd.<\/b><\/span><span>Updated <b>June 2026<\/b><\/span><\/div>\n  <\/header>\n\n  <nav class=\"ps-toc\" aria-label=\"Table of contents\">\n    <h2>Table des mati\u00e8res<\/h2>\n    <ol><li><a href=\"#jz-d1-role\">Polishing Slurry Beyond Semiconductors<\/a><\/li><li><a href=\"#jz-d1-chem\">Ceria and Silica for Glass<\/a><\/li><li><a href=\"#jz-d1-stages\">The Polishing Stages<\/a><\/li><li><a href=\"#jz-d1-targets\">The Quality Targets<\/a><\/li><li><a href=\"#jz-d1-control\">Roughness, Figure and Damage Control<\/a><\/li><li><a href=\"#jz-d1-recycle\">Slurry Management and Recycling<\/a><\/li><li><a href=\"#jz-d1-select\">Selecting an Optical Polishing Slurry<\/a><\/li><\/ol>\n  <\/nav>\n\n  <section class=\"ps-sec\" id=\"jz-d1-role\"><h2>Polishing Slurry Beyond Semiconductors<\/h2><p>While CMP dominates the conversation, the same formulation principles drive precision optics. Lenses, mirrors, prisms, fibre-optic components, display glass and flat glass all require slurries that deliver extreme smoothness and accurate surface form. The chemistry-plus-mechanics balance is identical to wafer CMP \u2014 see the <a href=\"https:\/\/jeez-semicon.com\/fr\/blog\/What-Is-Polishing-Slurry\/\" target=\"_blank\" rel=\"noopener\">pillar guide<\/a> et <a href=\"https:\/\/jeez-semicon.com\/fr\/blog\/How-CMP-Slurry-Works\/\" target=\"_blank\" rel=\"noopener\">how CMP slurry works<\/a> \u2014 only the substrates, tooling and quality targets differ.<\/p><p>Optics is in many ways the original home of slurry polishing, with centuries of craft behind it, now expressed through engineered ceria and silica formulations and precise process control.<\/p><\/section><section class=\"ps-sec\" id=\"jz-d1-chem\"><h2>Ceria and Silica for Glass<\/h2><p>Optical glass polishing relies heavily on cerium oxide, whose chemical affinity for silica-based glass produces fast, smooth, low-damage removal \u2014 the same property that makes it dominant in dielectric CMP, explained in the <a href=\"https:\/\/jeez-semicon.com\/fr\/blog\/Oxide-and-Dielectric-Ceria-CMP-Slurry-Guide\/\" target=\"_blank\" rel=\"noopener\">oxide and dielectric ceria guide<\/a>. Colloidal silica is used for final, ultra-low-roughness finishing where the gentlest possible action is needed. The <a href=\"https:\/\/jeez-semicon.com\/fr\/blog\/Silica-vs-Ceria-vs-Alumina-vs-Diamond-Slurry\/\" target=\"_blank\" rel=\"noopener\">abrasive comparison<\/a> covers how these choices trade off, and harder abrasives such as alumina or diamond appear in earlier shaping stages on hard glasses.<\/p><\/section><section class=\"ps-sec\" id=\"jz-d1-stages\"><h2>The Polishing Stages<\/h2><p>Optical surfaces are brought to finish in stages, each with its own abrasive and particle size:<\/p><ul class='ps-list'><li><b>Grinding \/ shaping<\/b> \u2014 coarse abrasives remove bulk material and define the rough form, leaving subsurface damage.<\/li><li><b>Polissage<\/b> \u2014 ceria slurry on a polishing tool removes the damaged layer and develops smoothness and figure.<\/li><li><b>Final finishing<\/b> \u2014 fine colloidal silica achieves sub-nanometre roughness for the most demanding optics.<\/li><\/ul><p>Each stage must remove the damage left by the previous one; skipping or rushing a stage leaves defects that surface later as scatter or weakness.<\/p><\/section><section class=\"ps-sec\" id=\"jz-d1-targets\"><h2>The Quality Targets<\/h2><ul class='ps-list'><li><b>Rugosit\u00e9 de la surface<\/b> \u2014 often sub-nanometre for high-end optics, governing scatter and clarity.<\/li><li><b>Figure accuracy<\/b> \u2014 how closely the surface matches its intended shape, measured in fractions of a wavelength.<\/li><li><b>Subsurface damage<\/b> \u2014 microcracks below the surface that must be removed to preserve strength and optical quality.<\/li><li><b>Defect density<\/b> \u2014 scratches and digs that are unacceptable on a finished optic.<\/li><\/ul><div class='ps-callout'><span class='tag'>Why slurry quality shows<\/span><p>On a polished optic, a single oversized particle can leave a visible scratch. Tight large-particle control \u2014 the same property prized in CMP \u2014 is just as decisive in optics.<\/p><\/div><\/section><section class=\"ps-sec\" id=\"jz-d1-control\"><h2>Roughness, Figure and Damage Control<\/h2><p>Achieving these targets is a controlled progression: coarser slurries remove subsurface damage from grinding, then progressively finer slurries refine roughness and figure. Abrasive size and distribution, pH, slurry stability, temperature and process parameters all influence the outcome. As with CMP, a stable slurry with a controlled particle tail is the foundation of a repeatable, low-defect finish, and figure control depends on keeping the tool, pressure and slurry condition steady over long polishing runs.<\/p><\/section><section class=\"ps-sec\" id=\"jz-d1-recycle\"><h2>Slurry Management and Recycling<\/h2><p>Optical shops often use ceria slurry in recirculating systems, which makes slurry management central to both cost and quality. Over time the abrasive breaks down, glass swarf accumulates and the size distribution shifts, so the slurry must be monitored, replenished and eventually replaced. Well-run recycling lowers cost and waste, but unmanaged recirculation lets the particle distribution drift and defectivity climb \u2014 the optics equivalent of the stability concerns in wafer CMP.<\/p><\/section><section class=\"ps-sec\" id=\"jz-d1-select\"><h2>Selecting an Optical Polishing Slurry<\/h2><p>Match the abrasive to the glass and the stage: ceria for efficient bulk and intermediate polishing, fine colloidal silica for final finishing. Specify roughness, figure and defect targets, account for your recirculation and management scheme, then validate on your own material and tooling. For the hardest optical substrates such as sapphire, a different, harder-abrasive approach is needed \u2014 see the <a href=\"https:\/\/jeez-semicon.com\/fr\/blog\/Sapphire-Substrate-Polishing-Slurry-Guide\/\" target=\"_blank\" rel=\"noopener\">sapphire substrate polishing slurry guide<\/a>.<\/p><\/section>\n\n  <section class=\"ps-related\">\n    <h2>Continue Learning<\/h2>\n    <p class=\"sub\">Explore the rest of the JEEZ polishing slurry knowledge series.<\/p>\n    <div class=\"ps-cards\"><a class=\"ps-card pillar\" href=\"https:\/\/jeez-semicon.com\/fr\/blog\/What-Is-Polishing-Slurry\/\" target=\"_blank\" rel=\"noopener\"><span class=\"k\">Start here \u00b7 Pillar guide<\/span><span class=\"t\">What Is Polishing Slurry? The Complete Guide<\/span><\/a><a class=\"ps-card\" href=\"https:\/\/jeez-semicon.com\/fr\/blog\/Silica-vs-Ceria-vs-Alumina-vs-Diamond-Slurry\/\" target=\"_blank\" rel=\"noopener\"><span class=\"k\">Related guide<\/span><span class=\"t\">Silica vs Ceria vs Alumina vs Diamond Slurry<\/span><\/a><a class=\"ps-card\" href=\"https:\/\/jeez-semicon.com\/fr\/blog\/Oxide-and-Dielectric-Ceria-CMP-Slurry-Guide\/\" target=\"_blank\" rel=\"noopener\"><span class=\"k\">Related guide<\/span><span class=\"t\">Oxide and Dielectric Ceria CMP Slurry Guide<\/span><\/a><a class=\"ps-card\" href=\"https:\/\/jeez-semicon.com\/fr\/blog\/Sapphire-Substrate-Polishing-Slurry-Guide\/\" target=\"_blank\" rel=\"noopener\"><span class=\"k\">Related guide<\/span><span class=\"t\">Sapphire Substrate Polishing Slurry Guide<\/span><\/a><\/div>\n  <\/section>\n\n  <section class=\"ps-sec ps-faq\" id=\"jz-d1-faq\"><h2>Questions fr\u00e9quemment pos\u00e9es<\/h2><details open><summary>What slurry is used to polish optical glass?<\/summary><div class=\"ans\">Optical glass is most often polished with cerium-oxide slurry, whose chemical affinity for silica glass gives fast, smooth, low-damage removal. Fine colloidal silica is used for final ultra-low-roughness finishing, with harder abrasives reserved for earlier shaping stages.<\/div><\/details><details><summary>Why is ceria so effective on glass?<\/summary><div class=\"ans\">Ceria interacts chemically with silica-based glass in a way that enhances removal beyond pure mechanical action, producing low roughness and minimal subsurface damage. This is the same chemical-tooth property that makes it dominant in dielectric CMP.<\/div><\/details><details><summary>What is subsurface damage in optics?<\/summary><div class=\"ans\">Subsurface damage is the network of microcracks left below the surface by earlier grinding. It must be removed by polishing because it weakens the component and degrades optical quality. Staged polishing with progressively finer slurries removes it.<\/div><\/details><details><summary>Can optical polishing slurry be recycled?<\/summary><div class=\"ans\">Yes. Ceria slurry is often used in recirculating systems to lower cost and waste. The slurry must be monitored and replenished because the abrasive breaks down and glass swarf accumulates over time, shifting the particle distribution and raising defectivity if left unmanaged.<\/div><\/details><details><summary>How is optical polishing slurry selected?<\/summary><div class=\"ans\">Match the abrasive and particle size to the glass and the polishing stage \u2014 ceria for bulk and intermediate steps, fine silica for final finishing \u2014 then validate against roughness, figure and defect targets on your own material, tooling and recirculation scheme.<\/div><\/details><\/section>\n\n  <section class=\"ps-cta\">\n    <h2>Talk to the JEEZ slurry engineering team<\/h2>\n    <p>From first slurry selection to defectivity optimisation and multi-source qualification, JEEZ \u2014 Jizhi Electronic Technology Co., Ltd. \u2014 helps you match the right polishing slurry to your material and process targets.<\/p>\n    <a class=\"ps-btn\" href=\"https:\/\/jeez-semicon.com\/fr\/contact\/\" target=\"_blank\" rel=\"noopener\">Contact JEEZ <span>\u2192<\/span><\/a>\n  <\/section>\n\n  <p class=\"ps-signoff\">Part of the JEEZ Polishing Slurry knowledge series. Reviewed and updated June 2026 by Jizhi Electronic Technology Co., Ltd.<\/p>\n<\/div>\n\n<script type=\"application\/ld+json\">\n{\n  \"@context\":\"https:\/\/schema.org\",\"@type\":\"Article\",\n  \"headline\":\"Polishing Slurry for Optical Glass and Lenses\",\n  \"description\":\"How polishing slurry works for optical glass and lenses: ceria and silica chemistry, the polishing stages, surface roughness and figure accuracy, subsurface damage, slurry recycling and selection for precision optics.\",\n  \"author\":{\"@type\":\"Organization\",\"name\":\"JEEZ \\u2014 Jizhi Electronic Technology Co., Ltd.\",\"url\":\"https:\/\/jeez-semicon.com\/\"},\n  \"publisher\":{\"@type\":\"Organization\",\"name\":\"Jizhi Electronic Technology Co., Ltd.\",\"logo\":{\"@type\":\"ImageObject\",\"url\":\"https:\/\/jeez-semicon.com\/wp-content\/uploads\/jeez-logo.png\"}},\n  \"datePublished\":\"2026-06-01\",\"dateModified\":\"2026-06-01\",\n  \"mainEntityOfPage\":{\"@type\":\"WebPage\",\"@id\":\"https:\/\/jeez-semicon.com\/blog\/Polishing-Slurry-for-Optical-Glass-and-Lenses\"}\n}\n<\/script>\n<script type=\"application\/ld+json\">\n{\n  \"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[\n    {\"@type\":\"Question\",\"name\":\"What slurry is used to polish optical glass?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Optical glass is most often polished with cerium-oxide slurry, whose chemical affinity for silica glass gives fast, smooth, low-damage removal. Fine colloidal silica is used for final ultra-low-roughness finishing, with harder abrasives reserved for earlier shaping stages.\"}},\n    {\"@type\":\"Question\",\"name\":\"Why is ceria so effective on glass?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Ceria interacts chemically with silica-based glass in a way that enhances removal beyond pure mechanical action, producing low roughness and minimal subsurface damage. This is the same chemical-tooth property that makes it dominant in dielectric CMP.\"}},\n    {\"@type\":\"Question\",\"name\":\"What is subsurface damage in optics?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Subsurface damage is the network of microcracks left below the surface by earlier grinding. It must be removed by polishing because it weakens the component and degrades optical quality. Staged polishing with progressively finer slurries removes it.\"}},\n    {\"@type\":\"Question\",\"name\":\"Can optical polishing slurry be recycled?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. Ceria slurry is often used in recirculating systems to lower cost and waste. The slurry must be monitored and replenished because the abrasive breaks down and glass swarf accumulates over time, shifting the particle distribution and raising defectivity if left unmanaged.\"}},\n    {\"@type\":\"Question\",\"name\":\"How is optical polishing slurry selected?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Match the abrasive and particle size to the glass and the polishing stage \u2014 ceria for bulk and intermediate steps, fine silica for final finishing \u2014 then validate against roughness, figure and defect targets on your own material, tooling and recirculation scheme.\"}}\n  ]\n}\n<\/script>","protected":false},"excerpt":{"rendered":"<p>JEEZ \u00b7 Applications Precision optics demand surfaces measured in nanometres of roughness and fractions of a wavelength of figure. This guide explains how polishing slurry works for optical glass and  &#8230;<\/p>","protected":false},"author":1,"featured_media":2263,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[9,59],"tags":[],"class_list":["post-2261","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-industry"],"acf":[],"_links":{"self":[{"href":"https:\/\/jeez-semicon.com\/fr\/wp-json\/wp\/v2\/posts\/2261","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jeez-semicon.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jeez-semicon.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jeez-semicon.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jeez-semicon.com\/fr\/wp-json\/wp\/v2\/comments?post=2261"}],"version-history":[{"count":2,"href":"https:\/\/jeez-semicon.com\/fr\/wp-json\/wp\/v2\/posts\/2261\/revisions"}],"predecessor-version":[{"id":2264,"href":"https:\/\/jeez-semicon.com\/fr\/wp-json\/wp\/v2\/posts\/2261\/revisions\/2264"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/jeez-semicon.com\/fr\/wp-json\/wp\/v2\/media\/2263"}],"wp:attachment":[{"href":"https:\/\/jeez-semicon.com\/fr\/wp-json\/wp\/v2\/media?parent=2261"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jeez-semicon.com\/fr\/wp-json\/wp\/v2\/categories?post=2261"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jeez-semicon.com\/fr\/wp-json\/wp\/v2\/tags?post=2261"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}