{"id":12644,"date":"2026-03-30T03:53:57","date_gmt":"2026-03-30T03:53:57","guid":{"rendered":"https:\/\/hlh-js.com\/?p=12644"},"modified":"2026-03-30T05:40:34","modified_gmt":"2026-03-30T05:40:34","slug":"aluminum-oxide-for-glass-etching-frosting","status":"publish","type":"post","link":"https:\/\/hlh-js.com\/ja\/resource\/blog\/aluminum-oxide-for-glass-etching-frosting\/","title":{"rendered":"Aluminum Oxide for Glass Etching &amp; Frosting"},"content":{"rendered":"<style>\n\/* ============================================================\n   HLH Cluster Page 06 \u2013 Aluminum Oxide for Glass Etching & Frosting\n   Jiangsu Henglihong Technology Co., Ltd.\n   March 2026\n   ============================================================ *\/\n\n  @import url('https:\/\/fonts.googleapis.com\/css2?family=Playfair+Display:wght@600;700&family=DM+Sans:ital,wght@0,300;0,400;0,500;0,600;1,400&family=DM+Mono:wght@400;500&display=swap');\n\n  :root {\n    --navy:      #0d1b2a;\n    --steel:     #1e3a5f;\n    --sky:       #2176ae;\n    --sky-dk:    #155d8a;\n    --ice:       #e8f4fd;\n    --amber:     #d97706;\n    --amber-lt:  #fef3c7;\n    --green:     #166534;\n    --green-lt:  #dcfce7;\n    --violet:    #5b21b6;\n    --violet-lt: #f5f3ff;\n    --violet-bd: #ddd6fe;\n    --teal:      #0f766e;\n    --teal-lt:   #f0fdfa;\n    --teal-bd:   #99f6e4;\n    --sand:      #f5f0e8;\n    --white:     #ffffff;\n    --gray-50:   #f8f8f6;\n    --gray-100:  #efefec;\n    --gray-500:  #8a8a80;\n    --gray-700:  #454540;\n    --radius:    6px;\n    --shadow:    0 2px 20px rgba(13,27,42,.07);\n    --shadow-lg: 0 8px 40px rgba(13,27,42,.13);\n    --font-head: 'Playfair Display', Georgia, serif;\n    --font-body: 'DM Sans', system-ui, sans-serif;\n    --font-mono: 'DM Mono', monospace;\n  }\n\n  .hlh-c6 *, .hlh-c6 *::before, .hlh-c6 *::after { box-sizing: border-box; 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}\n  .more-links { list-style: none; padding: 0; margin: .75rem 0; }\n  .more-links li { padding: .46rem 0; border-bottom: 1px solid var(--gray-100); font-size: .93rem; }\n  .more-links li:last-child { border-bottom: none; }\n  .more-links a::before { content: \"\u2192  \"; color: var(--sky); font-weight: 600; }\n\n  \/* \u2500\u2500 Responsive \u2500\u2500 *\/\n  @media (max-width: 640px) {\n    .c6-hero { padding: 1.7rem 1rem 1.5rem; }\n    .hlh-c6 h2 { font-size: 1.28rem; }\n    .kf-bar { grid-template-columns: repeat(2, 1fr); }\n    .app-grid { grid-template-columns: 1fr 1fr; }\n    .finish-row { grid-template-columns: 1fr; }\n    .method-grid { grid-template-columns: 1fr; }\n    .btn-row { flex-direction: column; }\n    .btn { text-align: center; }\n  }\n  @media (max-width: 400px) {\n    .app-grid { grid-template-columns: 1fr; }\n  }\n<\/style>\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n     CLUSTER 06: Aluminum Oxide for Glass Etching & Frosting\n     Jiangsu Henglihong Technology Co., Ltd.\n     March 2026\n     \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n<div class=\"hlh-c6\">\n\n  <!-- \u2500\u2500 HERO \u2500\u2500 -->\n  <div class=\"c6-hero\">\n    <h1>Aluminum Oxide for Glass Etching &amp; Frosting<\/h1>\n    <p class=\"hero-sub\">The complete technical guide to using white fused aluminum oxide for architectural glass frosting, artistic etching, optical surface texturing, dental ceramics, and precision glass applications \u2014 covering grit selection, blast parameters, resist methods, and finish control.<\/p>\n    \n    <div class=\"hero-meta\">\n      <span>By Jiangsu Henglihong Technology Co., Ltd.<\/span>\n      <span>March 2026<\/span>\n      <span>~4,200 words \u00b7 16 min read<\/span>\n    <\/div>\n  <\/div>\n\n  <!-- \u2500\u2500 TOC \u2500\u2500 -->\n  <div class=\"toc-box\">\n    <div class=\"toc-title\">Table of Contents<\/div>\n    <ol>\n      <li><a href=\"#why-alumina\">Why Aluminum Oxide Is the Standard for Glass Blasting<\/a><\/li>\n      <li><a href=\"#applications\">Glass Etching &amp; Frosting Applications<\/a><\/li>\n      <li><a href=\"#grade-selection\">Grade Selection: Why White Fused Is Required<\/a><\/li>\n      <li><a href=\"#grit-and-finish\">Grit Size vs Finish Quality: Understanding the Relationship<\/a><\/li>\n      <li><a href=\"#blast-parameters\">Blast Parameters for Glass<\/a><\/li>\n      <li><a href=\"#resist-methods\">Resist and Stencil Methods<\/a><\/li>\n      <li><a href=\"#stage-blasting\">Stage Blasting for Depth and Relief Effects<\/a><\/li>\n      <li><a href=\"#glass-types\">Behavior on Different Glass Types<\/a><\/li>\n      <li><a href=\"#troubleshooting\">Troubleshooting Common Glass Blasting Problems<\/a><\/li>\n      <li><a href=\"#faq\">\u3088\u304f\u3042\u308b\u8cea\u554f<\/a><\/li>\n    <\/ol>\n  <\/div>\n\n  <!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n  <!-- SECTION 1 \u2013 Why Alumina            -->\n  <!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n  <h2 id=\"why-alumina\">1. Why Aluminum Oxide Is the Standard for Glass Blasting<\/h2>\n\n  <p>Glass etching and frosting by abrasive blasting requires a media that simultaneously satisfies four demanding criteria: it must cut glass reliably and consistently, leave no color contamination in the frosted surface, produce no respirable crystalline silica hazard, and be available in fine enough grit sizes to achieve the delicate surface textures that precision glass work demands. White fused aluminum oxide is the only abrasive that meets all four criteria simultaneously \u2014 which is why it has become the industry standard for glass blasting across applications ranging from architectural privacy screens to optical component surface preparation.<\/p>\n\n  <p>The comparison with its most common alternative \u2014 silicon carbide \u2014 illustrates the trade-offs well. Silicon carbide (Mohs 9.5) cuts glass slightly faster than aluminum oxide (Mohs 9.0), but generates significantly more dust, is harder to source in consistent fine-grit FEPA grades, and is substantially more expensive. For most glass blasting applications, white fused aluminum oxide delivers a better combination of cut quality, finish consistency, dust generation, and cost efficiency than any competing media.<\/p>\n\n  <div class=\"kf-bar\">\n    <div class=\"kf-cell\">\n      <span class=\"kf-val\">9.0<\/span>\n      <span class=\"kf-lbl\">Mohs hardness<\/span>\n    <\/div>\n    <div class=\"kf-cell\">\n      <span class=\"kf-val\">\u2265 99.5%<\/span>\n      <span class=\"kf-lbl\">Al\u2082O\u2083 purity<\/span>\n    <\/div>\n    <div class=\"kf-cell\">\n      <span class=\"kf-val\">F60\u2013F320<\/span>\n      <span class=\"kf-lbl\">Typical glass grit range<\/span>\n    <\/div>\n    <div class=\"kf-cell\">\n      <span class=\"kf-val\">20\u201350 PSI<\/span>\n      <span class=\"kf-lbl\">Standard blast pressure<\/span>\n    <\/div>\n    <div class=\"kf-cell\">\n      <span class=\"kf-val\">Pure white<\/span>\n      <span class=\"kf-lbl\">Color neutral \u2014 no tint<\/span>\n    <\/div>\n  <\/div>\n\n  <p>This guide focuses on white fused aluminum oxide for glass applications \u2014 the grade manufactured and exported by <strong>\u6c5f\u8607\u6052\u9686\u79d1\u6280\u6709\u9650\u516c\u53f8<\/strong> For the full product background including both grades and all industrial applications, see: <a href=\"https:\/\/hlh-js.com\/resource\/blog\/aluminum-oxide-blast-media-complete-buyers-guide\/\" target=\"_blank\">Aluminum Oxide Blast Media: The Complete Buyer&#8217;s Guide<\/a>.<\/p>\n\n  <hr class=\"hr\">\n\n  <!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n  <!-- SECTION 2 \u2013 Applications           -->\n  <!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n  <h2 id=\"applications\">2. Glass Etching &amp; Frosting Applications<\/h2>\n\n  <p>The range of glass applications served by aluminum oxide spans from high-volume architectural glass processing lines to individual artist studios \u2014 united by the shared requirement for a consistent, controllable, color-neutral matte or textured surface finish.<\/p>\n\n  <div class=\"app-grid\">\n\n    <div class=\"app-card\">\n      <div class=\"app-icon icon-arch\">AR<\/div>\n      <div class=\"app-name\">Architectural Frosting<\/div>\n      <div class=\"app-spec\">Privacy screens, shower panels, office partitions, balustrades, and decorative facades. Uniform full-surface frosting at consistent sheen level across large panel areas (up to several m\u00b2).<\/div>\n      <span class=\"app-grit\">F80\u2013F120 \u00b7 25\u201340 PSI<\/span>\n    <\/div>\n\n    <div class=\"app-card\">\n      <div class=\"app-icon icon-art\">AT<\/div>\n      <div class=\"app-name\">Artistic &amp; Decorative Etching<\/div>\n      <div class=\"app-spec\">Pictorial designs, monograms, lettering, and patterns using vinyl resist or photoresist stencils. Single-level frosting and multi-level carved relief effects on flat and curved glass.<\/div>\n      <span class=\"app-grit\">F120\u2013F220 \u00b7 20\u201335 PSI<\/span>\n    <\/div>\n\n    <div class=\"app-card\">\n      <div class=\"app-icon icon-opt\">OP<\/div>\n      <div class=\"app-name\">Optical &amp; Technical Glass<\/div>\n      <div class=\"app-spec\">Anti-reflective surface texturing on optical filters, lamp diffusers, light guide panels, and instrument display glass. Precise surface roughness control required (Ra tolerance \u00b1 0.1 \u00b5m).<\/div>\n      <span class=\"app-grit\">F220\u2013F400 \u00b7 15\u201330 PSI<\/span>\n    <\/div>\n\n    <div class=\"app-card\">\n      <div class=\"app-icon icon-dent\">DE<\/div>\n      <div class=\"app-name\">Dental Ceramics<\/div>\n      <div class=\"app-spec\">Surface preparation of porcelain-fused-to-metal (PFM) crowns, all-ceramic restorations, and zirconia frameworks before bonding agent application. Micro-roughness promotes mechanical adhesion of dental cements.<\/div>\n      <span class=\"app-grit\">F150\u2013F220 \u00b7 25\u201350 PSI<\/span>\n    <\/div>\n\n    <div class=\"app-card\">\n      <div class=\"app-icon icon-lab\">LB<\/div>\n      <div class=\"app-name\">Laboratory &amp; Scientific Glass<\/div>\n      <div class=\"app-spec\">Frosted graduations on volumetric glassware, identification marking on laboratory equipment, anti-slip surfaces on microscope slides, and surface preparation of borosilicate glass components.<\/div>\n      <span class=\"app-grit\">F120\u2013F220 \u00b7 20\u201335 PSI<\/span>\n    <\/div>\n\n    <div class=\"app-card\">\n      <div class=\"app-icon icon-func\">FN<\/div>\n      <div class=\"app-name\">Functional Surface Texturing<\/div>\n      <div class=\"app-spec\">Anti-slip texturing on glass floor panels and staircases, light-diffusing surfaces on LED cover glass, and ceramic frit removal from automotive glass panels for refinishing.<\/div>\n      <span class=\"app-grit\">F60\u2013F120 \u00b7 30\u201350 PSI<\/span>\n    <\/div>\n\n  <\/div>\n\n  <p>Each application type has distinct requirements for surface roughness, pattern edge definition, depth uniformity, and clarity of the frosted finish \u2014 all of which are governed by the interaction of grit size, blast pressure, and standoff distance described in the sections that follow.<\/p>\n\n  <hr class=\"hr\">\n\n  <!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n  <!-- SECTION 3 \u2013 Grade Selection        -->\n  <!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n  <h2 id=\"grade-selection\">3. Grade Selection: Why White Fused Is Required<\/h2>\n\n  <p>For any glass etching or frosting application, <strong>white fused aluminum oxide is the only acceptable grade<\/strong>. Brown fused aluminum oxide must never be used on glass for two reasons that are specific to this substrate:<\/p>\n\n  <h3>Color Contamination<\/h3>\n  <p>Brown fused aluminum oxide contains 1.5\u20133.8% titanium dioxide and 0.2\u20131.5% iron oxide \u2014 the compounds that give it its characteristic dark brown color. When brown-grade grains fracture on impact with a glass surface, microscopic colored particles become embedded in the freshly created micro-fissures of the frosted zone. The result is a frosted surface with a visible warm tan or brownish tint \u2014 particularly noticeable against backlit glass or on clear float glass panels where the intended finish is a neutral grey-white frost. This color contamination is irreversible and cannot be removed by cleaning. White fused aluminum oxide, with \u2265 99.5% Al\u2082O\u2083 and &lt; 0.05% Fe\u2082O\u2083, is genuinely color-neutral \u2014 the frosted surface retains its clean grey-white appearance under all lighting conditions.<\/p>\n\n  <h3>Silica Content and Surface Chemistry<\/h3>\n  <p>Brown fused aluminum oxide contains 0.5\u20132.0% SiO\u2082 \u2014 a reactive silicate component that, when driven into the glass surface at blast velocity, can alter the local surface chemistry and create surface irregularities that compromise optical clarity in precision glass applications. White fused aluminum oxide contains less than 0.1% SiO\u2082, making its interaction with the glass surface chemically consistent and predictable.<\/p>\n\n  <div class=\"warn-box\">\n    <strong>Field example \u2014 architectural frosted panels:<\/strong> A glazing contractor switches from white to brown fused aluminum oxide mid-project to reduce media cost. The completed panels exhibit a faint brownish cast under diffuse lighting \u2014 unacceptable for a high-end commercial installation. The entire batch of panels requires replacement. The cost of re-procurement and re-installation exceeds the media savings by more than 30:1. White fused aluminum oxide is non-negotiable for glass applications.\n  <\/div>\n\n  <p>For a full comparison of white and brown fused aluminum oxide properties and application decision logic, see: <a href=\"https:\/\/hlh-js.com\/resource\/blog\/brown-vs-white-aluminum-oxide-which-should-you-use\/\" target=\"_blank\">Brown vs White Aluminum Oxide: Which Should You Use?<\/a><\/p>\n\n  <hr class=\"hr\">\n\n  <!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n  <!-- SECTION 4 \u2013 Grit and Finish        -->\n  <!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n  <h2 id=\"grit-and-finish\">4. Grit Size vs Finish Quality: Understanding the Relationship<\/h2>\n\n  <p>Grit size is the primary control variable for glass surface finish quality. A smaller (finer) grit produces a smoother, more translucent frosted surface \u2014 maximum light transmission with a soft, even sheen. A larger (coarser) grit produces a rougher, more opaque frosted surface \u2014 lower light transmission with a deeper, more tactile texture. The relationship is direct and predictable, which is what makes aluminum oxide ideal for specification-grade glass work: once the grit-finish relationship is calibrated for a given glass type and blast unit, it is highly reproducible across production runs.<\/p>\n\n  <!-- Finish comparison visual -->\n  <div class=\"finish-row\">\n    <div class=\"finish-card\">\n      <div class=\"finish-swatch swatch-fine\"><\/div>\n      <div class=\"finish-grit\">F180\u2013F320<\/div>\n      <div class=\"finish-label\">Fine \/ Satin Frost<\/div>\n      <div class=\"finish-rz\">Rz: 2\u20136 \u00b5m<\/div>\n      <div class=\"finish-use\">High translucency, soft diffused light transmission. Optical filters, precision instrument glass, fine artistic etching, dental ceramic bonding.<\/div>\n    <\/div>\n    <div class=\"finish-card\">\n      <div class=\"finish-swatch swatch-medium\"><\/div>\n      <div class=\"finish-grit\">F80\u2013F150<\/div>\n      <div class=\"finish-label\">Medium \/ Standard Frost<\/div>\n      <div class=\"finish-rz\">Rz: 8\u201318 \u00b5m<\/div>\n      <div class=\"finish-use\">Privacy at normal viewing distance, even matte appearance. Architectural partitions, shower screens, signage, decorative panels. The most widely used range.<\/div>\n    <\/div>\n    <div class=\"finish-card\">\n      <div class=\"finish-swatch swatch-coarse\"><\/div>\n      <div class=\"finish-grit\">F36\u2013F60<\/div>\n      <div class=\"finish-label\">Coarse \/ Heavy Texture<\/div>\n      <div class=\"finish-rz\">Rz: 25\u201345 \u00b5m<\/div>\n      <div class=\"finish-use\">High opacity, tactile surface, slip resistance. Anti-slip floor glass, deep artistic relief carving, decorative feature panels, industrial glass texturing.<\/div>\n    <\/div>\n  <\/div>\n\n  <h3>The Translucency\u2013Privacy Trade-off<\/h3>\n  <p>A commonly misunderstood relationship in architectural glass frosting is between surface roughness and privacy. A finer frost (F180\u2013F320) appears more translucent \u2014 figures and shapes remain visible through it \u2014 but still provides excellent privacy at close range by diffusing directional light. A coarser frost (F60\u2013F120) appears more opaque under most lighting conditions. For architectural privacy glass, F80\u2013F120 represents the practical optimum: sufficient opacity for privacy at normal office or residential viewing distances, while maintaining enough light transmission to keep interior spaces bright.<\/p>\n\n  <div class=\"hlh-table-wrap\">\n    <table class=\"hlh-table\">\n      <thead>\n        <tr>\n          <th>FEPA Grit<\/th>\n          <th>Particle Size (D50)<\/th>\n          <th>Surface Rz<\/th>\n          <th>Visual Effect<\/th>\n          <th>Light Transmission<\/th>\n          <th>Primary Application<\/th>\n        <\/tr>\n      <\/thead>\n      <tbody>\n        <tr>\n          <td><strong>F46\u2013F60<\/strong><\/td>\n          <td>300\u2013425 \u00b5m<\/td>\n          <td>25\u201345 \u00b5m<\/td>\n          <td>Heavy, opaque texture<\/td>\n          <td>20\u201335%<\/td>\n          <td>Anti-slip floor glass, deep relief carving<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>F80<\/strong><\/td>\n          <td>~212 \u00b5m<\/td>\n          <td>18\u201328 \u00b5m<\/td>\n          <td>Bold matte frost<\/td>\n          <td>35\u201350%<\/td>\n          <td>Industrial functional texturing, entrance glass<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>F100\u2013F120<\/strong><\/td>\n          <td>125\u2013150 \u00b5m<\/td>\n          <td>10\u201318 \u00b5m<\/td>\n          <td>Standard architectural frost<\/td>\n          <td>50\u201365%<\/td>\n          <td>Office partitions, shower screens, balustrades \u2014 <em>most popular range<\/em><\/td>\n        <\/tr>\n        <tr>\n          <td><strong>F150\u2013F180<\/strong><\/td>\n          <td>80\u2013100 \u00b5m<\/td>\n          <td>6\u201312 \u00b5m<\/td>\n          <td>Fine, semi-translucent frost<\/td>\n          <td>65\u201375%<\/td>\n          <td>Display glass, signage, decorative artistic work<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>F220<\/strong><\/td>\n          <td>~68 \u00b5m<\/td>\n          <td>4\u20138 \u00b5m<\/td>\n          <td>Very fine, luminous matte<\/td>\n          <td>70\u201380%<\/td>\n          <td>LED diffuser glass, fine artistic etching, optical components<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>F320\u2013F400<\/strong><\/td>\n          <td>30\u201340 \u00b5m<\/td>\n          <td>2\u20135 \u00b5m<\/td>\n          <td>Ultra-fine, near-polished satin<\/td>\n          <td>80\u201390%<\/td>\n          <td>Optical filters, scientific glass, premium display covers<\/td>\n        <\/tr>\n      <\/tbody>\n    <\/table>\n  <\/div>\n\n  <div class=\"info-box\">\n    <strong>Calibrate before production:<\/strong> Light transmission values in the table above are indicative for standard 6 mm float glass at normal incidence. Actual values depend on glass thickness, composition, and cumulative blast time per unit area. Always produce a calibration sample on the same glass type used in production, measure with a transmission meter, and document the grit-pressure-dwell combination that achieves the target finish before committing to a full production run.\n  <\/div>\n\n  <hr class=\"hr\">\n\n  <!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n  <!-- SECTION 5 \u2013 Blast Parameters       -->\n  <!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n  <h2 id=\"blast-parameters\">5. Blast Parameters for Glass<\/h2>\n\n  <p>Glass requires significantly lower blast pressures and shorter dwell times per unit area than steel. This is not only because glass is much softer (Mohs 5.5\u20136.5 vs steel at 5\u20138), but because over-blasting glass causes progressive surface darkening \u2014 a phenomenon where cumulative micro-fracturing of the glass surface transitions from the desired controlled frost to an increasingly opaque, rough, and visually inconsistent result that cannot be reversed.<\/p>\n\n  <h3>Recommended Blast Pressure by Application<\/h3>\n\n  <div class=\"hlh-table-wrap\">\n    <table class=\"hlh-table\">\n      <thead>\n        <tr>\n          <th>\u7533\u3057\u8fbc\u307f<\/th>\n          <th>Grit<\/th>\n          <th>Pressure (PSI)<\/th>\n          <th>Pressure (bar)<\/th>\n          <th>Standoff (cm)<\/th>\n          <th>Nozzle Angle<\/th>\n        <\/tr>\n      <\/thead>\n      <tbody>\n        <tr>\n          <td>Architectural full-panel frosting<\/td>\n          <td>F100\u2013F120<\/td>\n          <td>25\u201335<\/td>\n          <td>1.7\u20132.4<\/td>\n          <td>15\u201325<\/td>\n          <td>80\u201390\u00b0<\/td>\n        <\/tr>\n        <tr>\n          <td>Artistic stencil etching (shallow)<\/td>\n          <td>F120\u2013F180<\/td>\n          <td>20\u201330<\/td>\n          <td>1.4\u20132.1<\/td>\n          <td>12\u201320<\/td>\n          <td>75\u201390\u00b0<\/td>\n        <\/tr>\n        <tr>\n          <td>Deep relief carving (multi-stage)<\/td>\n          <td>F60\u2013F80 (stage 1), F120 (stage 2)<\/td>\n          <td>35\u201350<\/td>\n          <td>2.4\u20133.5<\/td>\n          <td>10\u201318<\/td>\n          <td>70\u201385\u00b0<\/td>\n        <\/tr>\n        <tr>\n          <td>Optical \/ technical glass texturing<\/td>\n          <td>F220\u2013F400<\/td>\n          <td>15\u201325<\/td>\n          <td>1.0\u20131.7<\/td>\n          <td>10\u201315<\/td>\n          <td>85\u201390\u00b0<\/td>\n        <\/tr>\n        <tr>\n          <td>Dental ceramic surface prep<\/td>\n          <td>F150\u2013F220<\/td>\n          <td>25\u201350<\/td>\n          <td>1.7\u20133.5<\/td>\n          <td>8\u201315<\/td>\n          <td>80\u201390\u00b0<\/td>\n        <\/tr>\n        <tr>\n          <td>Anti-slip floor glass texturing<\/td>\n          <td>F60\u2013F80<\/td>\n          <td>40\u201355<\/td>\n          <td>2.8\u20133.8<\/td>\n          <td>12\u201320<\/td>\n          <td>80\u201390\u00b0<\/td>\n        <\/tr>\n      <\/tbody>\n    <\/table>\n  <\/div>\n\n  <h3>Nozzle Type and Movement for Glass<\/h3>\n  <p>For glass applications, a suction-feed (siphon) blast cabinet is standard for small to medium panels. Direct-pressure systems deliver higher velocity and are appropriate only for heavier texturing work (anti-slip floor glass, deep relief carving) where a coarser finish is acceptable. For fine work (F180\u2013F320), a suction system at 15\u201325 PSI provides better control over the subtlety of the finish than a direct-pressure system.<\/p>\n\n  <p>Nozzle movement should be consistent \u2014 either mechanically controlled (conveyor-fed glass processing lines) or, for hand-blasting, performed with a regular side-to-side sweeping motion at a consistent speed. Dwell time irregularity (pausing or slowing in one area) creates visible variation in frost density that is readily apparent in final inspection under raking light. Many experienced glass blast artists practice nozzle motion on scrap glass before committing to production work.<\/p>\n\n  <h3>Cabinet Media Considerations for Glass<\/h3>\n  <p>Glass blasting cabinets must be dedicated to glass work or thoroughly cleaned between glass and metal applications. Any residual iron-bearing media (from a previous steel blasting session) that enters the glass circuit will create brown contamination spots on frosted glass surfaces. For the same reason, always use a new or verified-clean media charge when starting a glass production run, and keep the glass media circuit completely separate from any metal-blasting media system.<\/p>\n\n  <div class=\"violet-box\">\n    <strong>Moisture sensitivity at fine grits:<\/strong> Fine-grit white fused aluminum oxide (F180 and finer) has high surface area per unit mass and is prone to moisture absorption in storage. Damp fine-grit media clumps in the blast cabinet hopper and feed system, causing irregular flow and inconsistent finish. Store fine-grit media in sealed packaging, specify moisture \u2264 0.15% on your Certificate of Analysis, and use a cabinet with a desiccant air dryer if operating in humid environments (&gt;60% RH). Dry any damp media at 110 \u00b0C for 2 hours before use if clumping is observed.\n  <\/div>\n\n  <hr class=\"hr\">\n\n  <!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n  <!-- SECTION 6 \u2013 Resist Methods         -->\n  <!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n  <h2 id=\"resist-methods\">6. Resist and Stencil Methods<\/h2>\n\n  <p>Patterned glass etching \u2014 as distinct from uniform full-surface frosting \u2014 requires a resist material that protects the non-etched areas of the glass surface from the blast stream while allowing the exposed design areas to be frosted or carved. The choice of resist method determines the achievable design complexity, edge definition, and depth capability of the finished work.<\/p>\n\n  <div class=\"method-grid\">\n\n    <div class=\"method-card\">\n      <div class=\"method-badge badge-vinyl\">Most Common<\/div>\n      <div class=\"method-name\">Vinyl Resist Film (Adhesive-Backed)<\/div>\n      <div class=\"method-body\">Pre-cut or plotter-cut vinyl film, typically 125\u2013250 \u00b5m thick, applied directly to the glass surface. The cut design exposes only the areas to be etched; the vinyl protects the rest. Standard for architectural signage, decorative etching, and medium-complexity pictorial work.<\/div>\n      <div class=\"method-best\">Best for: flat glass, moderate complexity, F80\u2013F180, single-level frost.<\/div>\n    <\/div>\n\n    <div class=\"method-card\">\n      <div class=\"method-badge badge-photo\">High Detail<\/div>\n      <div class=\"method-name\">Photoresist Film<\/div>\n      <div class=\"method-body\">UV-sensitive film laminated to the glass, exposed through a photographic positive, and developed to create a resist. Capable of reproducing very fine detail \u2014 halftone gradients, fine text, complex pictorial imagery. Requires UV exposure equipment and darkroom conditions.<\/div>\n      <div class=\"method-best\">Best for: fine detail work, artistic photography reproduction, F150\u2013F400, shallow etch.<\/div>\n    <\/div>\n\n    <div class=\"method-card\">\n      <div class=\"method-badge badge-sandblast\">Heavy Duty<\/div>\n      <div class=\"method-name\">Sandblast Rubber Resist<\/div>\n      <div class=\"method-body\">Thick (600\u20131,200 \u00b5m) rubber or rubberized vinyl designed for deep carving and multi-stage relief work. Resists progressive erosion during extended blasting far better than thin vinyl film. Suitable for sculptural depth carving of 3\u201310 mm into the glass surface.<\/div>\n      <div class=\"method-best\">Best for: deep relief carving, curved glass, F60\u2013F100, multi-stage work.<\/div>\n    <\/div>\n\n    <div class=\"method-card\">\n      <div class=\"method-badge badge-rubber\">Traditional<\/div>\n      <div class=\"method-name\">Hand-Cut Rubber Stencil<\/div>\n      <div class=\"method-body\">Traditionally hand-cut from rolled rubber sheet using a scalpel or swivel knife. Produces organic, hand-made character that cannot be replicated by plotter-cutting. Labor-intensive but preferred by many studio glass artists for one-off commissioned pieces.<\/div>\n      <div class=\"method-best\">Best for: artistic one-off work, curved surfaces, where hand-crafted character is valued.<\/div>\n    <\/div>\n\n  <\/div>\n\n  <h3>Edge Definition and Resist Thickness<\/h3>\n  <p>The sharpness of the boundary between etched and unetched areas \u2014 called edge definition or line quality \u2014 is governed by resist thickness, grit size, blast pressure, and standoff distance. A thinner resist allows media to deflect under the resist edge at low angles, creating a slightly softened boundary \u2014 sometimes desirable for artistic work but unacceptable for precision signage or optical masking. A thicker resist provides a vertical wall at the design edge that produces a sharper, cleaner boundary. For maximum edge sharpness on architectural signage work, use a 250 \u00b5m or thicker vinyl resist, F120 grit at 25\u201330 PSI, and maintain a consistent 90\u00b0 nozzle angle relative to the glass surface throughout the blast pass.<\/p>\n\n  <hr class=\"hr\">\n\n  <!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n  <!-- SECTION 7 \u2013 Stage Blasting         -->\n  <!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n  <h2 id=\"stage-blasting\">7. Stage Blasting for Depth and Relief Effects<\/h2>\n\n  <p>Stage blasting \u2014 also called multi-level carving \u2014 is the technique that transforms flat glass etching into three-dimensional sculptural relief work. By selectively protecting completed design elements with additional resist layers while progressively blasting exposed areas deeper, an artist or fabricator can create glass surfaces with multiple distinct depth levels, producing a rich dimensional quality that simple one-level frosting cannot achieve.<\/p>\n\n  <div class=\"process-steps\">\n\n    <div class=\"ps-row\">\n      <div class=\"ps-num\">1<\/div>\n      <div>\n        <div class=\"ps-title\">Apply full-coverage base resist<\/div>\n        <div class=\"ps-body\">Cover the entire glass surface with a resist film. Using a plotter or hand-cutting, cut out the design elements that will be at the <em>deepest<\/em> level (furthest from the viewer in the final piece). These areas will be blasted in every subsequent stage and will therefore be the lowest in the finished relief.<\/div>\n      <\/div>\n    <\/div>\n\n    <div class=\"ps-row\">\n      <div class=\"ps-num\">2<\/div>\n      <div>\n        <div class=\"ps-title\">First blast pass \u2014 coarse grit, higher pressure<\/div>\n        <div class=\"ps-body\">Blast the exposed deepest-level areas with a coarser grit (F60\u2013F80) at 40\u201350 PSI to remove glass material rapidly and establish the foundation depth. A single pass at these parameters typically removes 0.5\u20131.5 mm of glass depth, depending on glass hardness and dwell time. Inspect depth with a depth gauge before proceeding.<\/div>\n      <\/div>\n    <\/div>\n\n    <div class=\"ps-row\">\n      <div class=\"ps-num\">3<\/div>\n      <div>\n        <div class=\"ps-title\">Apply second resist layer \u2014 medium-depth elements<\/div>\n        <div class=\"ps-body\">Without removing the original resist, apply an additional resist layer over the deepest-level elements that have already been blasted \u2014 effectively protecting them while exposing the next design level (the medium-depth elements). These areas were previously protected by the base resist and are now exposed for the first time.<\/div>\n      <\/div>\n    <\/div>\n\n    <div class=\"ps-row\">\n      <div class=\"ps-num\">4<\/div>\n      <div>\n        <div class=\"ps-title\">Second blast pass \u2014 medium grit<\/div>\n        <div class=\"ps-body\">Blast the newly exposed medium-depth areas with F80\u2013F120 at 30\u201340 PSI. Simultaneously, the deepest-level areas (now re-protected) continue to accumulate depth through this pass \u2014 increasing their depth advantage over the medium-level areas and enhancing the three-dimensional effect.<\/div>\n      <\/div>\n    <\/div>\n\n    <div class=\"ps-row\">\n      <div class=\"ps-num\">5<\/div>\n      <div>\n        <div class=\"ps-title\">Repeat for each depth level<\/div>\n        <div class=\"ps-body\">Additional resist applications and blast passes can be added to create three, four, or more distinct depth levels. Each additional level adds production time but increases the dimensionality and visual complexity of the finished piece. Most professional studio work uses three to five levels.<\/div>\n      <\/div>\n    <\/div>\n\n    <div class=\"ps-row\">\n      <div class=\"ps-num\">6<\/div>\n      <div>\n        <div class=\"ps-title\">Final pass \u2014 fine grit surface refinement<\/div>\n        <div class=\"ps-body\">Remove all resist. Apply a final light pass with F180\u2013F220 at 20\u201325 PSI over the entire design area to unify the surface texture and remove any inconsistencies from the earlier coarser passes. This final pass does not significantly alter depth but creates a consistent, professional surface quality across all levels.<\/div>\n      <\/div>\n    <\/div>\n\n  <\/div>\n\n  <div class=\"teal-box\">\n    <strong>Depth measurement:<\/strong> Use a depth gauge (dial indicator or digital depth micrometer) referenced against the unetched glass surface to track material removal between stages. Most decorative relief work targets 1\u20135 mm total depth for the deepest elements. Structural integrity of the glass begins to be compromised when carved depth exceeds approximately 50% of glass thickness \u2014 a 6 mm panel should not be carved deeper than approximately 2.5\u20133 mm in any single area without consultation with a glass structural engineer.\n  <\/div>\n\n  <hr class=\"hr\">\n\n  <!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n  <!-- SECTION 8 \u2013 Glass Types            -->\n  <!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n  <h2 id=\"glass-types\">8. Behavior on Different Glass Types<\/h2>\n\n  <p>Not all glass blasts the same way. Differences in composition, thermal history, and surface treatment create significant variation in blasting behavior \u2014 affecting the pressure required, the achievable surface finish quality, and the risk of fracture or unexpected failure during blasting.<\/p>\n\n  <div class=\"hlh-table-wrap\">\n    <table class=\"hlh-table\">\n      <thead>\n        <tr>\n          <th>Glass Type<\/th>\n          <th>\u30e2\u30fc\u30b9\u786c\u5ea6<\/th>\n          <th>Blast Behavior<\/th>\n          <th>Special Considerations<\/th>\n          <th>Recommended Grit Range<\/th>\n        <\/tr>\n      <\/thead>\n      <tbody>\n        <tr>\n          <td><strong>Float glass (soda-lime)<\/strong><\/td>\n          <td>5.5\u20136.0<\/td>\n          <td>Consistent, predictable. Most widely blasted glass type. Standard reference for all parameter tables.<\/td>\n          <td>Tin-rich surface (&#8220;tin side&#8221;) blasts slightly differently from air side \u2014 always blast the air side for consistent results. Use a UV lamp to identify tin side if uncertain.<\/td>\n          <td>F80\u2013F320<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>Tempered (toughened) glass<\/strong><\/td>\n          <td>5.5\u20136.0<\/td>\n          <td>Blasts similarly to float glass but has a compressive stress layer at the surface. Uniform frosting achievable. Never attempt deep carving \u2014 removing the compressive stress layer at any point may cause spontaneous catastrophic fracture.<\/td>\n          <td>Frosting only \u2014 no depth carving. Maximum depth: &lt;0.1 mm surface texture. Never cut or drill after blasting.<\/td>\n          <td>F100\u2013F220 \u00b7 low pressure<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>Laminated glass (PVB\/SGP interlayer)<\/strong><\/td>\n          <td>5.5\u20136.0<\/td>\n          <td>Blasts on the outer glass ply only. The interlayer is never exposed during normal blasting. Behaves like standard float glass on outer surface.<\/td>\n          <td>Avoid edge blasting \u2014 exposed interlayer at panel edges is vulnerable to moisture ingress if surface is etched too close to the edge.<\/td>\n          <td>F80\u2013F220<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>Borosilicate glass (lab \/ technical)<\/strong><\/td>\n          <td>6.0\u20136.5<\/td>\n          <td>Slightly harder than float glass \u2014 requires marginally higher pressure or longer dwell time for equivalent frosting. Produces clean, sharp surface texture. Very low thermal expansion \u2014 stable during blasting.<\/td>\n          <td>Commonly used for laboratory glassware and scientific instrument windows. Excellent dimensional stability.<\/td>\n          <td>F120\u2013F400<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>Fused silica \/ quartz glass<\/strong><\/td>\n          <td>7.0<\/td>\n          <td>Harder than standard glass \u2014 noticeably more resistant to blasting. Requires higher pressure or more passes. Produces high-quality, consistent surface texture for optical applications.<\/td>\n          <td>Higher media consumption per m\u00b2 than float glass. May require F60\u2013F80 for initial material removal, then F180\u2013F320 for finish quality.<\/td>\n          <td>F60\u2013F220 (two-stage)<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>Ceramic \/ porcelain<\/strong><\/td>\n          <td>6.5\u20137.5<\/td>\n          <td>Harder and more brittle than glass. Requires moderate pressure to avoid micro-cracking. White fused Al\u2082O\u2083 is the standard media for dental porcelain and technical ceramic surface preparation.<\/td>\n          <td>Dental ceramics: use F150\u2013F220 at 25\u201350 PSI. Industrial ceramic components: F120\u2013F220 at 35\u201355 PSI. Always test on sample before production.<\/td>\n          <td>F120\u2013F220<\/td>\n        <\/tr>\n      <\/tbody>\n    <\/table>\n  <\/div>\n\n  <hr class=\"hr\">\n\n  <!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n  <!-- SECTION 9 \u2013 Troubleshooting        -->\n  <!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n  <h2 id=\"troubleshooting\">9. Troubleshooting Common Glass Blasting Problems<\/h2>\n\n  <div class=\"hlh-table-wrap\">\n    <table class=\"hlh-table\">\n      <thead>\n        <tr>\n          <th>Problem<\/th>\n          <th>Most Likely Cause<\/th>\n          <th>Corrective Action<\/th>\n        <\/tr>\n      <\/thead>\n      <tbody>\n        <tr>\n          <td><strong>Brownish or warm-tinted frost<\/strong><\/td>\n          <td>Brown fused aluminum oxide used instead of white grade; cross-contamination from a previous metal-blasting session using brown media<\/td>\n          <td>Replace entire media charge with verified white fused Al\u2082O\u2083; deep-clean cabinet, hopper, and reclaim system before recharging; use dedicated glass-only equipment where possible<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>Uneven frost density \u2014 patchy or streaky appearance<\/strong><\/td>\n          <td>Inconsistent nozzle speed or standoff; variable blast pressure from compressor regulation failure; media bridging in hopper causing surges; worn nozzle producing irregular pattern<\/td>\n          <td>Use mechanical nozzle movement or practice consistent manual technique; service compressor pressure regulator; install hopper vibrator for fine grits; replace nozzle; verify media moisture content<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>Glass fracture during blasting<\/strong><\/td>\n          <td>Pressure too high for glass type; blasting over existing surface damage (chips, scratches); tempered glass being carved (not just frosted); thermal shock from localized heating<\/td>\n          <td>Reduce pressure; inspect glass for pre-existing damage before blasting; restrict tempered glass work to frosting only; ensure glass is at room temperature before blasting<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>Poor resist adhesion \u2014 undercutting at pattern edges<\/strong><\/td>\n          <td>Glass surface not clean before resist application; resist film too thin for the blast parameters used; nozzle angle too oblique (spray hitting under resist edge)<\/td>\n          <td>Clean glass with isopropyl alcohol before resist application; use thicker resist (250+ \u00b5m); maintain nozzle at 80\u201390\u00b0 to glass surface; reduce standoff distance<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>Visible &#8220;orange peel&#8221; texture instead of smooth frost<\/strong><\/td>\n          <td>Grit too coarse for the intended finish; blast pressure too high; inconsistent media particle size from degraded media charge<\/td>\n          <td>Step to a finer grit; reduce pressure; replace or top up media charge; perform sieve analysis to verify D50 has not drifted below specification<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>Media clumping in cabinet hopper<\/strong><\/td>\n          <td>Media moisture content too high; fine grit (F180+) stored in humid conditions; no hopper agitation for fine grades<\/td>\n          <td>Dry media at 110 \u00b0C for 2 hours; specify moisture \u2264 0.15% on CoA; install hopper vibrator or agitator paddle; use desiccant air dryer on blast air supply<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>Frosted surface appears cloudy or milky under backlight<\/strong><\/td>\n          <td>Over-blasting (cumulative blast time too long); grit too coarse for the glass thickness and intended effect; multiple overlapping passes creating excessive depth<\/td>\n          <td>Reduce blast time per unit area; switch to finer grit; use a single systematic pass rather than multiple overlapping passes; calibrate dwell time on scrap glass before production<\/td>\n        <\/tr>\n      <\/tbody>\n    <\/table>\n  <\/div>\n\n  <hr class=\"hr\">\n\n  <!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n  <!-- SECTION 10 \u2013 FAQ                   -->\n  <!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n  <h2 id=\"faq\">10. Frequently Asked Questions<\/h2>\n\n  <div class=\"faq-item\">\n    <button class=\"faq-q\" onclick=\"c6ToggleFaq(this)\">\n      Can I use brown fused aluminum oxide for glass etching if I cannot source white grade?\n      <span class=\"faq-icon\">+<\/span>\n    <\/button>\n    <div class=\"faq-a\">\n      <p>No \u2014 not for any application where finish color quality matters. Brown fused aluminum oxide will impart a visible warm tan tint to the frosted glass surface due to iron and titanium oxide particles embedded during blasting. This is irreversible. The only alternative to white fused aluminum oxide for color-neutral glass blasting is silicon carbide \u2014 but silicon carbide costs significantly more per kilogram, generates more dust, and is not available in the same fine FEPA grit range as white fused Al\u2082O\u2083. For glass applications, white fused aluminum oxide is effectively non-substitutable. Jiangsu Henglihong Technology supplies white fused aluminum oxide in the full fine-grit range from F60 through F1200 \u2014 contact us for lead times and pricing.<\/p>\n    <\/div>\n  <\/div>\n\n  <div class=\"faq-item\">\n    <button class=\"faq-q\" onclick=\"c6ToggleFaq(this)\">\n      What is the difference between &#8220;etching&#8221; and &#8220;frosting&#8221; glass?\n      <span class=\"faq-icon\">+<\/span>\n    <\/button>\n    <div class=\"faq-a\">\n      <p>In professional glass processing terminology, the two terms describe different intentions rather than different techniques. &#8220;Frosting&#8221; refers to uniform, full-surface or large-area matte texturing that creates a consistent translucent appearance \u2014 typically for privacy or decorative purposes on architectural glass. &#8220;Etching&#8221; refers to selective surface texturing of defined design areas using a resist stencil \u2014 creating patterned images, text, or pictorial designs in the glass surface. Both use the same abrasive (white fused aluminum oxide), the same blast equipment, and many of the same operating parameters. The distinction is primarily in the intent and the use (or absence) of a resist material. In casual usage, &#8220;etching&#8221; is often used to describe any abrasive glass surface treatment \u2014 including what would technically be called frosting \u2014 and this interchangeable use is widely accepted in the trade.<\/p>\n    <\/div>\n  <\/div>\n\n  <div class=\"faq-item\">\n    <button class=\"faq-q\" onclick=\"c6ToggleFaq(this)\">\n      Can tempered glass be etched or carved with aluminum oxide?\n      <span class=\"faq-icon\">+<\/span>\n    <\/button>\n    <div class=\"faq-a\">\n      <p>Tempered glass can be surface-frosted with aluminum oxide \u2014 a light surface texturing that does not significantly penetrate below the compressive stress layer (approximately 1\u20132 mm deep on standard tempered glass). Use F100\u2013F220 at low pressure (20\u201330 PSI) for uniform frosting and limit blast time to achieve only the desired surface texture. However, tempered glass must never be depth-carved, cut, drilled, or subjected to any process that penetrates the compressive stress layer. Removing the compressive stress layer releases the stored strain energy, causing the panel to shatter catastrophically into the characteristic small granular fragments of tempered glass. All cutting, drilling, and notching of tempered glass must be performed before tempering \u2014 never after. If you need a frosted-and-carved tempered glass panel, the carving must be done before tempering, followed by a light frost-only blast pass after tempering.<\/p>\n    <\/div>\n  <\/div>\n\n  <div class=\"faq-item\">\n    <button class=\"faq-q\" onclick=\"c6ToggleFaq(this)\">\n      How do I achieve a consistent frost across a large panel (e.g. 2 m \u00d7 1 m)?\n      <span class=\"faq-icon\">+<\/span>\n    <\/button>\n    <div class=\"faq-a\">\n      <p>Consistency across large panels is the principal challenge in architectural glass frosting and requires attention to four variables simultaneously. First, use a consistent, overlapping nozzle movement pattern \u2014 either horizontal passes with 30\u201350% overlap, or a conveyor-fed automated system where the glass moves at constant speed under a fixed nozzle array. Second, maintain constant nozzle-to-glass standoff distance throughout the panel \u2014 use a standoff spacer guide on the nozzle if hand-blasting. Third, ensure the blast cabinet or blast room air volume is sufficient to prevent dust buildup that would impede visibility and create uneven blasting conditions as the session progresses. Fourth, verify that the compressor delivers consistent pressure throughout the session \u2014 pressure drop from a compressor tank running low causes progressively lighter frosting toward the end of a panel. Ideally, blast large architectural panels using automated conveyor equipment or a motorized carriage, which eliminates operator speed variability \u2014 the dominant cause of inconsistent frosting on manual hand-blast work.<\/p>\n    <\/div>\n  <\/div>\n\n  <div class=\"faq-item\">\n    <button class=\"faq-q\" onclick=\"c6ToggleFaq(this)\">\n      Is aluminum oxide blast media reusable for glass applications?\n      <span class=\"faq-icon\">+<\/span>\n    <\/button>\n    <div class=\"faq-a\">\n      <p>Yes, in a closed-loop blast cabinet with a functional air wash separator. White fused aluminum oxide used for glass blasting typically achieves 5\u201310 recycle cycles before the particle size distribution degrades to the point where the achievable surface finish quality falls below the standard required for production work. The key performance indicator for glass media is not anchor profile depth (as it is for metal applications) but surface finish consistency \u2014 specifically the uniformity and sheen level of the frosted area. When the frosted finish becomes noticeably coarser or less consistent from the start to end of a panel, it is time to top up the media charge. For more detail on recycle economics and lifecycle management, see: <a href=\"https:\/\/hlh-js.com\/resource\/blog\/is-aluminum-oxide-blast-media-reusable-how-many-times\/\" target=\"_blank\">Is Aluminum Oxide Blast Media Reusable? How Many Times?<\/a><\/p>\n    <\/div>\n  <\/div>\n\n  <div class=\"faq-item\">\n    <button class=\"faq-q\" onclick=\"c6ToggleFaq(this)\">\n      What finishing steps are required after glass blasting?\n      <span class=\"faq-icon\">+<\/span>\n    <\/button>\n    <div class=\"faq-a\">\n      <p>After blasting, remove all resist material (if used) by peeling the vinyl or rubber, or washing off photoresist per the resist manufacturer&#8217;s instructions. Clean the glass surface with compressed air to remove residual media particles, followed by a wipe with a lint-free cloth and isopropyl alcohol to remove any fine alumina dust from the frosted surface. The frosted surface will be slightly hygroscopic \u2014 fine frost will appear cleaner and more uniform after the cleaning step than directly after blasting. For architectural glass that will be sealed with a protective coating (anti-fingerprint coating, sealing wax, or proprietary glass sealant), apply the sealer within 24 hours of blasting to prevent moisture absorption by the frosted surface. For premium glass art pieces, many studios apply a thin coat of mineral oil or beeswax to the frosted areas, which darkens the frost slightly and enriches its visual depth \u2014 though this finish requires periodic renewal.<\/p>\n    <\/div>\n  <\/div>\n\n  <!-- \u2500\u2500 CTA \u2500\u2500 -->\n  <div class=\"cta-block\">\n    <h2>Source Fine-Grit White Fused Aluminum Oxide<\/h2>\n    <p>Jiangsu Henglihong Technology supplies white fused aluminum oxide for glass etching and frosting from F60 through F1200 \u2014 with tight FEPA grit tolerances, moisture \u2264 0.15%, and full Certificate of Analysis documentation on every batch.<\/p>\n    <div class=\"btn-row\">\n      <a class=\"btn btn-amber\" href=\"https:\/\/hlh-js.com\/contact\/\" target=\"_blank\">Request a Quote<\/a>\n      <a class=\"btn btn-ghost\" href=\"https:\/\/hlh-js.com\/products\/\" target=\"_blank\">View Products<\/a>\n    <\/div>\n  <\/div>\n\n  <!-- \u2500\u2500 Explore More \u2500\u2500 -->\n  <h2 style=\"margin-top:2.8rem;\">Related Resources<\/h2>\n  <p>Continue with these guides from the Henglihong resource library:<\/p>\n  <ul class=\"more-links\">\n    <li><a href=\"https:\/\/hlh-js.com\/resource\/blog\/aluminum-oxide-blast-media-complete-buyers-guide\/\" target=\"_blank\">Aluminum Oxide Blast Media: The Complete Buyer&#8217;s Guide<\/a><\/li>\n    <li><a href=\"https:\/\/hlh-js.com\/resource\/blog\/aluminum-oxide-grit-size-chart-selection-guide\/\" target=\"_blank\">Aluminum Oxide Grit Size Chart &amp; Selection Guide<\/a><\/li>\n    <li><a href=\"https:\/\/hlh-js.com\/resource\/blog\/brown-vs-white-aluminum-oxide-which-should-you-use\/\" target=\"_blank\">Brown vs White Aluminum Oxide: Which Should You Use?<\/a><\/li>\n    <li><a href=\"https:\/\/hlh-js.com\/resource\/blog\/aluminum-oxide-vs-garnet-blast-media-full-comparison\/\" target=\"_blank\">Aluminum Oxide vs Garnet Blast Media: Full Comparison<\/a><\/li>\n    <li><a href=\"https:\/\/hlh-js.com\/resource\/blog\/how-to-choose-aluminum-oxide-blast-media-for-steel-surfaces\/\" target=\"_blank\">How to Choose Aluminum Oxide Blast Media for Steel Surfaces<\/a><\/li>\n    <li><a href=\"https:\/\/hlh-js.com\/resource\/blog\/is-aluminum-oxide-blast-media-reusable-how-many-times\/\" target=\"_blank\">Is Aluminum Oxide Blast Media Reusable? How Many Times?<\/a><\/li>\n    <li><a href=\"https:\/\/hlh-js.com\/resource\/blog\/aluminum-oxide-blast-media-for-aerospace-medical\/\" target=\"_blank\">Aluminum Oxide Blast Media for Aerospace &amp; Medical<\/a><\/li>\n    <li><a href=\"https:\/\/hlh-js.com\/resource\/blog\/bulk-aluminum-oxide-blast-media-wholesale-pricing-rfq\/\" target=\"_blank\">Bulk Aluminum Oxide Blast Media \u2013 Wholesale Pricing &amp; RFQ<\/a><\/li>\n    <li><a href=\"https:\/\/hlh-js.com\/resource\/blog\/aluminum-oxide-anti-slip-additive-for-floor-coatings\/\" target=\"_blank\">Aluminum Oxide Anti-Slip Additive for Floor Coatings<\/a><\/li>\n  <\/ul>\n\n<\/div>\n\n<script>\nfunction c6ToggleFaq(btn) {\n  var item = btn.closest('.faq-item');\n  var isOpen = item.classList.contains('open');\n  document.querySelectorAll('.faq-item.open').forEach(function(el){ el.classList.remove('open'); });\n  if (!isOpen) { item.classList.add('open'); }\n}\n<\/script>","protected":false},"excerpt":{"rendered":"<p>Aluminum Oxide for Glass Etching &amp; Frosting The complete technical  [&#8230;]<\/p>","protected":false},"author":1,"featured_media":12669,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[62,177,138],"tags":[],"class_list":["post-12644","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-material","category-resource"],"_links":{"self":[{"href":"https:\/\/hlh-js.com\/ja\/wp-json\/wp\/v2\/posts\/12644","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hlh-js.com\/ja\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hlh-js.com\/ja\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hlh-js.com\/ja\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/hlh-js.com\/ja\/wp-json\/wp\/v2\/comments?post=12644"}],"version-history":[{"count":2,"href":"https:\/\/hlh-js.com\/ja\/wp-json\/wp\/v2\/posts\/12644\/revisions"}],"predecessor-version":[{"id":12646,"href":"https:\/\/hlh-js.com\/ja\/wp-json\/wp\/v2\/posts\/12644\/revisions\/12646"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hlh-js.com\/ja\/wp-json\/wp\/v2\/media\/12669"}],"wp:attachment":[{"href":"https:\/\/hlh-js.com\/ja\/wp-json\/wp\/v2\/media?parent=12644"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hlh-js.com\/ja\/wp-json\/wp\/v2\/categories?post=12644"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hlh-js.com\/ja\/wp-json\/wp\/v2\/tags?post=12644"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}