{"id":12629,"date":"2026-03-30T01:08:17","date_gmt":"2026-03-30T01:08:17","guid":{"rendered":"https:\/\/hlh-js.com\/?p=12629"},"modified":"2026-03-30T05:39:45","modified_gmt":"2026-03-30T05:39:45","slug":"aluminum-oxide-grit-size-chart-selection-guide","status":"publish","type":"post","link":"https:\/\/hlh-js.com\/de\/resource\/blog\/aluminum-oxide-grit-size-chart-selection-guide\/","title":{"rendered":"Aluminum Oxide Grit Size Chart &amp; Selection Guide"},"content":{"rendered":"<style>\n\/* ============================================================\n   HLH Cluster Page 01 \u2013 Aluminum Oxide Grit Size Chart\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    --sand:      #f5f0e8;\n    --white:     #ffffff;\n    --gray-50:   #f8f8f6;\n    --gray-100:  #efefec;\n    --gray-300:  #c8c8c0;\n    --gray-500:  #8a8a80;\n    --gray-700:  #454540;\n    --text:      #1a1a16;\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-c1 *, .hlh-c1 *::before, .hlh-c1 *::after {\n    box-sizing: border-box; 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}\n\n  \/* \u2500\u2500 Explore more links \u2500\u2500 *\/\n  .more-links { list-style: none; padding: 0; margin: .75rem 0; }\n  .more-links li {\n    padding: .46rem 0; border-bottom: 1px solid var(--gray-100);\n    font-size: .93rem;\n  }\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    .c1-hero { padding: 1.7rem 1rem 1.5rem; }\n    .hlh-c1 h2 { font-size: 1.28rem; }\n    .kf-bar { grid-template-columns: repeat(2, 1fr); }\n    .steps-grid { grid-template-columns: 1fr; }\n    .btn-row { flex-direction: column; }\n    .btn { text-align: center; }\n    .profile-label { min-width: 52px; font-size: .72rem; }\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 01: Aluminum Oxide Grit Size Chart & Selection Guide\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-c1\">\n\n  <!-- \u2500\u2500 HERO \u2500\u2500 -->\n  <div class=\"c1-hero\">\n    <h1>Aluminum Oxide Grit Size Chart &amp; Selection Guide<\/h1>\n    <p class=\"hero-sub\">A complete engineering reference \u2014 FEPA and ANSI grit tables, anchor profile depths, substrate-specific recommendations, and a step-by-step selection framework for specification engineers and procurement professionals.<\/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 TABLE OF CONTENTS \u2500\u2500 -->\n  <div class=\"toc-box\">\n    <div class=\"toc-title\">Table of Contents<\/div>\n    <ol>\n      <li><a href=\"#why-grit-matters\">Why Grit Size Is the Most Critical Specification<\/a><\/li>\n      <li><a href=\"#standards\">FEPA vs ANSI: Understanding the Two Standards<\/a><\/li>\n      <li><a href=\"#master-chart\">Master Grit Size Reference Chart<\/a><\/li>\n      <li><a href=\"#profile-depth\">Anchor Profile Depth by Grit Size<\/a><\/li>\n      <li><a href=\"#selection-steps\">5-Step Grit Selection Framework<\/a><\/li>\n      <li><a href=\"#by-substrate\">Substrate-Specific Recommendations<\/a><\/li>\n      <li><a href=\"#grade-and-grit\">Grade &amp; Grit Together: Brown vs White<\/a><\/li>\n      <li><a href=\"#pressure-and-grit\">Blast Pressure, Nozzle &amp; Grit Interaction<\/a><\/li>\n      <li><a href=\"#common-mistakes\">Six Common Grit Selection Mistakes<\/a><\/li>\n      <li><a href=\"#faq\">H\u00e4ufig gestellte Fragen<\/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 Grit Matters       -->\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-grit-matters\">1. Why Grit Size Is the Most Critical Specification<\/h2>\n\n  <p>When engineers and procurement managers source aluminum oxide blast media, they routinely focus on price per kilogram and delivery lead time \u2014 and overlook the specification that most directly determines whether a blasted surface will perform as intended: grit size. Selecting the wrong grit produces outcomes at both extremes that are costly to correct.<\/p>\n\n  <p>Too coarse a grit creates an anchor profile that is deeper than the coating system is designed to bridge. The peaks of the profile can &#8220;tent&#8221; through thin topcoats, leaving unprotected metal exposed at the tips \u2014 a failure mode that accelerates corrosion directly under the coating and voids most manufacturer warranties. Too fine a grit, on the other hand, fails to generate adequate mechanical tooth for the coating to grip. The result is adhesion failure \u2014 delamination under service load, impact, or thermal cycling \u2014 often within months of application.<\/p>\n\n  <div class=\"info-box\">\n    <strong>The engineering principle:<\/strong> Most high-performance protective coating manufacturers specify that the surface anchor profile depth (Rz, measured to ISO 8503 or ASTM D4417) should be approximately <em>one-third of the specified dry film thickness (DFT)<\/em> of the applied coating system. If your coating system calls for a 150 \u00b5m DFT, your target anchor profile is approximately 50 \u00b5m \u2014 and your grit selection should be calibrated to produce that range consistently.\n  <\/div>\n\n  <p>Grit size also directly governs the <strong>surface cleanliness grade achievable<\/strong> at a given blast pressure. Coarser grits physically remove more surface mass per impact event, enabling SSPC-SP 5 (White Metal) and SP 10 (Near-White) grades that finer grits cannot achieve efficiently. Finally, grit size determines <strong>media consumption rate<\/strong> \u2014 coarser particles carry more kinetic energy and fracture more readily on impact, increasing the top-up requirement per square meter treated.<\/p>\n\n  <!-- Key stats -->\n  <div class=\"kf-bar\">\n    <div class=\"kf-cell\">\n      <span class=\"kf-val\">\u2153<\/span>\n      <span class=\"kf-lbl\">Profile Rz : Coat DFT Ratio<\/span>\n    <\/div>\n    <div class=\"kf-cell\">\n      <span class=\"kf-val\">F12\u2013F1200<\/span>\n      <span class=\"kf-lbl\">Available FEPA Range<\/span>\n    <\/div>\n    <div class=\"kf-cell\">\n      <span class=\"kf-val\">8\u20132,360 \u00b5m<\/span>\n      <span class=\"kf-lbl\">Particle Size Span<\/span>\n    <\/div>\n    <div class=\"kf-cell\">\n      <span class=\"kf-val\">ISO 8503<\/span>\n      <span class=\"kf-lbl\">Profile Measurement Std.<\/span>\n    <\/div>\n  <\/div>\n\n  <p>This guide provides a comprehensive, engineering-grade reference for grit size selection across both brown fused and white fused aluminum oxide \u2014 the two grades manufactured and exported by <strong>Jiangsu Henglihong Technology Co, Ltd.<\/strong> For a full introduction to both product grades and all other aspects of aluminum oxide blast media, see our complete buyer&#8217;s guide: <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 Standards              -->\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=\"standards\">2. FEPA vs ANSI: Understanding the Two Standards<\/h2>\n\n  <p>Aluminum oxide blast media is graded under two principal international grit size systems. Understanding which system your coating specification, equipment manual, or procurement document references prevents ordering errors that can set a project back by weeks.<\/p>\n\n  <h3>FEPA (Federation of European Producers of Abrasives)<\/h3>\n  <p>FEPA is the dominant global standard for loose abrasive grains used in blasting and abrasive applications. FEPA F-grits (for bonded and coated abrasives) are designated with the prefix &#8220;F&#8221; followed by a number \u2014 for example, F24, F36, F60. A higher FEPA number indicates a finer particle. FEPA specifies the allowable particle size distribution through a defined sieve stack analysis: the standard prescribes maximum percentages for the coarse fraction, the median fraction (D50 window), and the fine fraction, ensuring every manufacturer&#8217;s F36, for instance, falls within the same particle size envelope regardless of country of origin.<\/p>\n\n  <h3>ANSI (American National Standards Institute)<\/h3>\n  <p>ANSI B74.12 governs loose abrasive grains in the United States and Canada. ANSI grit numbers \u2014 often expressed as simple mesh numbers without a prefix (#36, #60, #120) \u2014 are broadly equivalent to FEPA F-grits of the same number, though there are subtle differences in the permissible size distribution tolerances at each grade. In practice, for blast media selection purposes, FEPA F36 and ANSI #36 are interchangeable; the particle size windows are closely matched.<\/p>\n\n  <div class=\"hlh-table-wrap\">\n    <table class=\"hlh-table\">\n      <thead>\n        <tr>\n          <th>FEPA Designation<\/th>\n          <th>ANSI Equivalent<\/th>\n          <th>Governing Standard<\/th>\n          <th>Primary Market<\/th>\n          <th>Notes<\/th>\n        <\/tr>\n      <\/thead>\n      <tbody>\n        <tr>\n          <td><strong>F12\u2013F220<\/strong><\/td>\n          <td>#12\u2013#220<\/td>\n          <td>FEPA 42-2:2006<\/td>\n          <td>Europe, Asia, global export<\/td>\n          <td>Most widely used for blast media specification<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>F240\u2013F1200<\/strong><\/td>\n          <td>\u2014<\/td>\n          <td>FEPA 42-2:2006 (fine range)<\/td>\n          <td>Europe, Asia<\/td>\n          <td>Fine polishing range; ANSI P-grits differ significantly here<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>P-grits (P12\u2013P2500)<\/strong><\/td>\n          <td>\u2014<\/td>\n          <td>FEPA 43-1:2006<\/td>\n          <td>Coated abrasives (sandpaper)<\/td>\n          <td>Not used for blast media; different distribution tolerance<\/td>\n        <\/tr>\n      <\/tbody>\n    <\/table>\n  <\/div>\n\n  <div class=\"warn-box\">\n    <strong>Do not confuse F-grits with P-grits.<\/strong> FEPA F-grits are for loose grain blasting applications. FEPA P-grits are for coated abrasives (sandpaper). F60 and P60 are <em>not<\/em> the same particle size \u2014 P60 is finer than F60. Always confirm your specification uses F-grits when ordering blast media.\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 3 \u2013 Master Chart           -->\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=\"master-chart\">3. Master Grit Size Reference Chart<\/h2>\n\n  <p>The table below is the primary engineering reference for aluminum oxide blast media grit specifications. All particle size values reflect FEPA 42-2 D50 midpoints. Anchor profile depths are indicative values for angular fused aluminum oxide blasted at 70\u201380 PSI on mild steel at 25\u201330 cm standoff; actual results vary with blast pressure, nozzle wear, standoff distance, substrate hardness, and equipment design. The grade availability column indicates whether brown fused (B), white fused (W), or both (B+W) are commercially stocked by Henglihong at that grit.<\/p>\n\n  <div class=\"hlh-table-wrap\">\n    <table class=\"hlh-table\">\n      <thead>\n        <tr>\n          <th>FEPA Grit<\/th>\n          <th>ANSI Mesh<\/th>\n          <th>D50 Particle Size<\/th>\n          <th>Particle Range (\u00b5m)<\/th>\n          <th>Anchor Profile Rz<\/th>\n          <th>Grade Available<\/th>\n          <th>Primary Use<\/th>\n        <\/tr>\n      <\/thead>\n      <tbody>\n        <tr>\n          <td><strong>F12<\/strong><\/td>\n          <td>#12<\/td>\n          <td>~2,000 \u00b5m<\/td>\n          <td>1,700\u20132,360<\/td>\n          <td>100\u2013130 \u00b5m<\/td>\n          <td><span class=\"gr-brown\">Braun<\/span><\/td>\n          <td>Heavy mill scale, large structural steel, civil infrastructure<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>F14<\/strong><\/td>\n          <td>#14<\/td>\n          <td>~1,700 \u00b5m<\/td>\n          <td>1,400\u20132,000<\/td>\n          <td>95\u2013125 \u00b5m<\/td>\n          <td><span class=\"gr-brown\">Braun<\/span><\/td>\n          <td>Heavy scale, bridge girders, ship hull pre-treatment<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>F16<\/strong><\/td>\n          <td>#16<\/td>\n          <td>~1,400 \u00b5m<\/td>\n          <td>1,180\u20131,700<\/td>\n          <td>80\u2013110 \u00b5m<\/td>\n          <td><span class=\"gr-brown\">Braun<\/span><\/td>\n          <td>Ship hulls, offshore platforms, heavy rust removal<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>F20<\/strong><\/td>\n          <td>#20<\/td>\n          <td>~1,000 \u00b5m<\/td>\n          <td>850\u20131,180<\/td>\n          <td>70\u201395 \u00b5m<\/td>\n          <td><span class=\"gr-brown\">Braun<\/span><\/td>\n          <td>Heavy fabrication, structural steel coating prep<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>F24<\/strong><\/td>\n          <td>#24<\/td>\n          <td>~850 \u00b5m<\/td>\n          <td>710\u20131,000<\/td>\n          <td>60\u201385 \u00b5m<\/td>\n          <td><span class=\"gr-both\">Brown + White<\/span><\/td>\n          <td>General steel fabrication, pipe coating, tank linings<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>F30<\/strong><\/td>\n          <td>#30<\/td>\n          <td>~710 \u00b5m<\/td>\n          <td>600-850<\/td>\n          <td>55\u201375 \u00b5m<\/td>\n          <td><span class=\"gr-both\">Brown + White<\/span><\/td>\n          <td>Steel prep for high-build coatings, industrial machinery<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>F36<\/strong><\/td>\n          <td>#36<\/td>\n          <td>~600 \u00b5m<\/td>\n          <td>500-710<\/td>\n          <td>40\u201365 \u00b5m<\/td>\n          <td><span class=\"gr-both\">Brown + White<\/span><\/td>\n          <td>Near-white blast, moderate-build protective coatings \u2014 <em>most popular blast grade<\/em><\/td>\n        <\/tr>\n        <tr>\n          <td><strong>F40<\/strong><\/td>\n          <td>#40<\/td>\n          <td>~500 \u00b5m<\/td>\n          <td>425-600<\/td>\n          <td>35\u201355 \u00b5m<\/td>\n          <td><span class=\"gr-both\">Brown + White<\/span><\/td>\n          <td>General industrial coatings, automotive fabrication<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>F46<\/strong><\/td>\n          <td>#46<\/td>\n          <td>~425 \u00b5m<\/td>\n          <td>355-500<\/td>\n          <td>30\u201350 \u00b5m<\/td>\n          <td><span class=\"gr-both\">Brown + White<\/span><\/td>\n          <td>Powder coating prep, automotive, general fabrication<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>F54<\/strong><\/td>\n          <td>#54<\/td>\n          <td>~355 \u00b5m<\/td>\n          <td>300-425<\/td>\n          <td>25\u201342 \u00b5m<\/td>\n          <td><span class=\"gr-both\">Brown + White<\/span><\/td>\n          <td>Lighter steel prep, aluminum components, thin-film primer<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>F60<\/strong><\/td>\n          <td>#60<\/td>\n          <td>~300 \u00b5m<\/td>\n          <td>250-355<\/td>\n          <td>22\u201336 \u00b5m<\/td>\n          <td><span class=\"gr-both\">Brown + White<\/span><\/td>\n          <td>Precision cleaning, dental lab, thin epoxy coatings<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>F70<\/strong><\/td>\n          <td>#70<\/td>\n          <td>~250 \u00b5m<\/td>\n          <td>212-300<\/td>\n          <td>18\u201330 \u00b5m<\/td>\n          <td><span class=\"gr-both\">Brown + White<\/span><\/td>\n          <td>Fine steel prep, stainless steel surface conditioning<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>F80<\/strong><\/td>\n          <td>#80<\/td>\n          <td>~212 \u00b5m<\/td>\n          <td>180-250<\/td>\n          <td>15\u201326 \u00b5m<\/td>\n          <td><span class=\"gr-both\">Brown + White<\/span><\/td>\n          <td>Stainless steel, precision components, light cleaning<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>F90<\/strong><\/td>\n          <td>#90<\/td>\n          <td>~180 \u00b5m<\/td>\n          <td>150-212<\/td>\n          <td>12\u201322 \u00b5m<\/td>\n          <td><span class=\"gr-white\">Wei\u00df<\/span><\/td>\n          <td>Precision metal prep, electronics substrate cleaning<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>F100<\/strong><\/td>\n          <td>#100<\/td>\n          <td>~150 \u00b5m<\/td>\n          <td>125-180<\/td>\n          <td>10\u201318 \u00b5m<\/td>\n          <td><span class=\"gr-white\">Wei\u00df<\/span><\/td>\n          <td>Fine component prep, dental bonding surface treatment<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>F120<\/strong><\/td>\n          <td>#120<\/td>\n          <td>~125 \u00b5m<\/td>\n          <td>106-150<\/td>\n          <td>8\u201316 \u00b5m<\/td>\n          <td><span class=\"gr-both\">Brown + White<\/span><\/td>\n          <td>Glass etching, frosting, stainless descaling, medical implant prep<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>F150<\/strong><\/td>\n          <td>#150<\/td>\n          <td>~100 \u00b5m<\/td>\n          <td>75\u2013125<\/td>\n          <td>6\u201312 \u00b5m<\/td>\n          <td><span class=\"gr-white\">Wei\u00df<\/span><\/td>\n          <td>Fine glass work, ceramic prep, orthopedic implant surface texture<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>F180<\/strong><\/td>\n          <td>#180<\/td>\n          <td>~80 \u00b5m<\/td>\n          <td>63-106<\/td>\n          <td>5\u201310 \u00b5m<\/td>\n          <td><span class=\"gr-white\">Wei\u00df<\/span><\/td>\n          <td>Precision ceramics, optics, fine glass etching<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>F220<\/strong><\/td>\n          <td>#220<\/td>\n          <td>~68 \u00b5m<\/td>\n          <td>53-75<\/td>\n          <td>4\u20138 \u00b5m<\/td>\n          <td><span class=\"gr-white\">Wei\u00df<\/span><\/td>\n          <td>Ultra-fine glass, ceramics, electronic components, micro-blasting<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>F240\u2013F1200<\/strong><\/td>\n          <td>\u2014<\/td>\n          <td>8\u201358 \u00b5m<\/td>\n          <td>Varies<\/td>\n          <td>&lt;4 \u00b5m<\/td>\n          <td><span class=\"gr-white\">Wei\u00df<\/span><\/td>\n          <td>Lapping, polishing, optical and electronic component finishing<\/td>\n        <\/tr>\n      <\/tbody>\n    <\/table>\n  <\/div>\n\n  <div class=\"success-box\">\n    <strong>Most popular blast media grits:<\/strong> For general industrial surface preparation, <strong>F36<\/strong> is the single most widely specified blast grade globally \u2014 it sits in the optimal zone between cutting aggression, profile consistency, and media longevity. For aerospace and medical applications, <strong>F120<\/strong> white fused is the most commonly specified precision grade.\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 4 \u2013 Profile Depth          -->\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=\"profile-depth\">4. Anchor Profile Depth by Grit Size<\/h2>\n\n  <p>The anchor profile \u2014 also called surface roughness, surface profile, or blast profile \u2014 is the peak-to-valley height (Rz) of the micro-topography created by blasting. It is the mechanical key that allows protective coatings to grip the substrate surface. Profile depth is primarily governed by grit size, with secondary influence from blast pressure, nozzle angle, standoff distance, and substrate hardness.<\/p>\n\n  <p>The visual below shows the relative profile depth achievable across key grit sizes at standard blast conditions (70 PSI, mild steel, 25 cm standoff, angular fused aluminum oxide):<\/p>\n\n  <!-- Profile depth visual bars -->\n  <div class=\"profile-bar-wrap\">\n    <div class=\"profile-row\">\n      <div class=\"profile-label\">F12<\/div>\n      <div class=\"profile-track\">\n        <div class=\"profile-fill\" style=\"width:100%;background:linear-gradient(90deg,#0d1b2a,#2176ae);\">\n          <span class=\"profile-val\">100\u2013130 \u00b5m<\/span>\n        <\/div>\n      <\/div>\n    <\/div>\n    <div class=\"profile-row\">\n      <div class=\"profile-label\">F16<\/div>\n      <div class=\"profile-track\">\n        <div class=\"profile-fill\" style=\"width:86%;background:linear-gradient(90deg,#0d1b2a,#2176ae);\">\n          <span class=\"profile-val\">80\u2013110 \u00b5m<\/span>\n        <\/div>\n      <\/div>\n    <\/div>\n    <div class=\"profile-row\">\n      <div class=\"profile-label\">F24<\/div>\n      <div class=\"profile-track\">\n        <div class=\"profile-fill\" style=\"width:68%;background:linear-gradient(90deg,#1e3a5f,#2176ae);\">\n          <span class=\"profile-val\">60\u201385 \u00b5m<\/span>\n        <\/div>\n      <\/div>\n    <\/div>\n    <div class=\"profile-row\">\n      <div class=\"profile-label\">F36<\/div>\n      <div class=\"profile-track\">\n        <div class=\"profile-fill\" style=\"width:50%;background:linear-gradient(90deg,#2176ae,#3a99d4);\">\n          <span class=\"profile-val\">40\u201365 \u00b5m<\/span>\n        <\/div>\n      <\/div>\n    <\/div>\n    <div class=\"profile-row\">\n      <div class=\"profile-label\">F46<\/div>\n      <div class=\"profile-track\">\n        <div class=\"profile-fill\" style=\"width:38%;background:linear-gradient(90deg,#2176ae,#3a99d4);\">\n          <span class=\"profile-val\">30\u201350 \u00b5m<\/span>\n        <\/div>\n      <\/div>\n    <\/div>\n    <div class=\"profile-row\">\n      <div class=\"profile-label\">F60<\/div>\n      <div class=\"profile-track\">\n        <div class=\"profile-fill\" style=\"width:27%;background:linear-gradient(90deg,#3a99d4,#5ab3e0);\">\n          <span class=\"profile-val\">22\u201336 \u00b5m<\/span>\n        <\/div>\n      <\/div>\n    <\/div>\n    <div class=\"profile-row\">\n      <div class=\"profile-label\">F120<\/div>\n      <div class=\"profile-track\">\n        <div class=\"profile-fill\" style=\"width:14%;background:linear-gradient(90deg,#5ab3e0,#7fc8ea);\">\n          <span class=\"profile-val\">8\u201316 \u00b5m<\/span>\n        <\/div>\n      <\/div>\n    <\/div>\n    <div class=\"profile-row\">\n      <div class=\"profile-label\">F220<\/div>\n      <div class=\"profile-track\">\n        <div class=\"profile-fill\" style=\"width:6%;background:#a8d8f0;\">\n          <span class=\"profile-val\" style=\"color:#1e3a5f;\">4\u20138 \u00b5m<\/span>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/div>\n\n  <h3>How to Measure Anchor Profile<\/h3>\n  <p>Two methods are accepted by most international coating inspection standards:<\/p>\n  <ul>\n    <li><strong>ISO 8503 \/ Testex Replica Tape (ASTM D4417 Method B):<\/strong> Press-O-Film or equivalent replica tape is pressed onto the blasted surface, creating a physical replica of the profile. The replica thickness is measured with a micrometer and the substrate thickness subtracted. Simple, portable, and produces a permanent record. Accepted by virtually all coating inspection protocols.<\/li>\n    <li><strong>Electronic Profilometer (ASTM D4417 Method C \/ ISO 4287):<\/strong> A contact stylus profilometer traverses the surface and computes Rz, Ra, and other roughness parameters. Provides more data than replica tape but requires equipment calibration and is sensitive to measurement direction relative to blast pattern.<\/li>\n  <\/ul>\n  <p>Minimum measurement requirement: five independent readings per inspection area, with the mean reported against the coating manufacturer&#8217;s specified tolerance.<\/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 5 \u2013 Selection Steps        -->\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=\"selection-steps\">5. Five-Step Grit Selection Framework<\/h2>\n\n  <p>Use this systematic process for any new blasting application. It takes approximately 15 minutes to complete with a coating product data sheet in hand \u2014 and prevents the far more expensive outcome of re-blasting after a specification non-conformance.<\/p>\n\n  <div class=\"steps-grid\">\n    <div class=\"step-card\">\n      <div class=\"step-num\">1<\/div>\n      <div class=\"step-title\">Identify the substrate<\/div>\n      <div class=\"step-body\">What metal or material are you blasting? Carbon steel, stainless, aluminum, titanium, glass, ceramic? Substrate hardness and contamination-sensitivity govern both grade (brown vs white) and grit ceiling.<\/div>\n    <\/div>\n    <div class=\"step-card\">\n      <div class=\"step-num\">2<\/div>\n      <div class=\"step-title\">Read the coating data sheet<\/div>\n      <div class=\"step-body\">Your topcoat manufacturer&#8217;s Product Data Sheet (PDS) will specify the required surface preparation standard (e.g. SSPC-SP 10) and the acceptable anchor profile range in \u00b5m or mils. This range is your target.<\/div>\n    <\/div>\n    <div class=\"step-card\">\n      <div class=\"step-num\">3<\/div>\n      <div class=\"step-title\">Select the profile zone<\/div>\n      <div class=\"step-body\">Cross-reference the required Rz range against the master chart in Section 3. Identify one or two FEPA grit sizes whose indicative profile range sits within the PDS specification. Choose the coarser option if cleaning is also required.<\/div>\n    <\/div>\n    <div class=\"step-card\">\n      <div class=\"step-num\">4<\/div>\n      <div class=\"step-title\">Confirm grade compatibility<\/div>\n      <div class=\"step-body\">If the substrate is stainless, aluminum, titanium, or destined for food \/ medical \/ aerospace service, specify white fused aluminum oxide. For carbon steel general prep, brown fused is the cost-effective default. See our full guide: <a href=\"https:\/\/hlh-js.com\/resource\/blog\/brown-vs-white-aluminum-oxide-which-should-you-use\/\" target=\"_blank\">Brown vs White: Which to Use?<\/a><\/div>\n    <\/div>\n    <div class=\"step-card\">\n      <div class=\"step-num\">5<\/div>\n      <div class=\"step-title\">Validate with a trial blast<\/div>\n      <div class=\"step-body\">Before full production, blast a representative test panel at production conditions. Measure the anchor profile with ISO 8503 replica tape (five readings). Adjust blast pressure or switch to the adjacent grit size if the achieved Rz is outside the target range.<\/div>\n    <\/div>\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 By Substrate           -->\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=\"by-substrate\">6. Substrate-Specific Grit Recommendations<\/h2>\n\n  <p>Different substrates require different grit strategies. The table below consolidates recommended grit ranges, grade selection, and key considerations for the most common blast-media application scenarios.<\/p>\n\n  <div class=\"hlh-table-wrap\">\n    <table class=\"hlh-table\">\n      <thead>\n        <tr>\n          <th>Substrate \/ Application<\/th>\n          <th>Recommended Grit<\/th>\n          <th>Grade<\/th>\n          <th>Target Profile (Rz)<\/th>\n          <th>Key Consideration<\/th>\n        <\/tr>\n      <\/thead>\n      <tbody>\n        <tr>\n          <td><strong>Structural carbon steel (SP 10)<\/strong><\/td>\n          <td>F24\u2013F36<\/td>\n          <td><span class=\"gr-brown\">Braun<\/span><\/td>\n          <td>50\u201385 \u00b5m<\/td>\n          <td>Most economical choice; high recyclability in closed systems<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>Structural carbon steel (SP 5)<\/strong><\/td>\n          <td>F16\u2013F24<\/td>\n          <td><span class=\"gr-brown\">Braun<\/span><\/td>\n          <td>70\u2013110 \u00b5m<\/td>\n          <td>Higher pressure required; check substrate section thickness<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>Stainless steel (all grades)<\/strong><\/td>\n          <td>F46\u2013F80<\/td>\n          <td><span class=\"gr-white\">Wei\u00df<\/span><\/td>\n          <td>20\u201340 \u00b5m<\/td>\n          <td>White grade mandatory \u2014 iron from brown grade causes corrosion halos<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>Aluminum alloys<\/strong><\/td>\n          <td>F60\u2013F120<\/td>\n          <td><span class=\"gr-white\">Wei\u00df<\/span><\/td>\n          <td>10\u201325 \u00b5m<\/td>\n          <td>Use lower pressure (40\u201360 PSI); aluminum is soft and deforms under coarser grits<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>Titanium (aerospace)<\/strong><\/td>\n          <td>F80\u2013F120<\/td>\n          <td><span class=\"gr-white\">Wei\u00df<\/span><\/td>\n          <td>8\u201318 \u00b5m<\/td>\n          <td>AMS 2431 compliance required; no iron contamination acceptable<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>Cast iron<\/strong><\/td>\n          <td>F24\u2013F46<\/td>\n          <td><span class=\"gr-brown\">Braun<\/span><\/td>\n          <td>40\u201370 \u00b5m<\/td>\n          <td>Brittle substrate \u2014 excessive pressure risks micro-fracture at casting skin<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>Galvanized \/ zinc-coated steel<\/strong><\/td>\n          <td>F46\u2013F80<\/td>\n          <td><span class=\"gr-both\">Brown or White<\/span><\/td>\n          <td>20\u201340 \u00b5m<\/td>\n          <td>Sweep blast only \u2014 coarser grits remove zinc and defeat the purpose<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>Glass (etching \/ frosting)<\/strong><\/td>\n          <td>F120\u2013F220<\/td>\n          <td><span class=\"gr-white\">Wei\u00df<\/span><\/td>\n          <td>6\u201316 \u00b5m<\/td>\n          <td>White grade avoids color contamination; reduce pressure to 20\u201335 PSI<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>Glass (deep artistic etch)<\/strong><\/td>\n          <td>F60\u2013F120<\/td>\n          <td><span class=\"gr-white\">Wei\u00df<\/span><\/td>\n          <td>15\u201330 \u00b5m<\/td>\n          <td>Coarser grit + resist stencil for relief \/ three-dimensional effects<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>Medical implants (Ti \/ Co-Cr)<\/strong><\/td>\n          <td>F120\u2013F220<\/td>\n          <td><span class=\"gr-white\">Wei\u00df<\/span><\/td>\n          <td>4\u201316 \u00b5m<\/td>\n          <td>Traceability and batch documentation required; ISO 9001 supplier minimum<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>Dental ceramic bonding<\/strong><\/td>\n          <td>F80\u2013F150<\/td>\n          <td><span class=\"gr-white\">Wei\u00df<\/span><\/td>\n          <td>6\u201318 \u00b5m<\/td>\n          <td>Micro-blast unit at 30\u201350 PSI; single-use media for cross-contamination prevention<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>Thermal spray (HVOF) prep<\/strong><\/td>\n          <td>F24\u2013F36<\/td>\n          <td><span class=\"gr-white\">Wei\u00df<\/span><\/td>\n          <td>50\u201380 \u00b5m<\/td>\n          <td>White grade prevents iron contamination of thermal spray bond coat<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>Anti-slip floor coating additive<\/strong><\/td>\n          <td>F46\u2013F80<\/td>\n          <td><span class=\"gr-both\">Brown or White<\/span><\/td>\n          <td>N\/A (incorporated in coating)<\/td>\n          <td>Size selected for coating thickness; see our <a href=\"https:\/\/hlh-js.com\/resource\/blog\/aluminum-oxide-anti-slip-additive-for-floor-coatings\/\" target=\"_blank\">anti-slip guide<\/a><\/td>\n        <\/tr>\n        <tr>\n          <td><strong>Stone \/ concrete texturing<\/strong><\/td>\n          <td>F16\u2013F36<\/td>\n          <td><span class=\"gr-brown\">Braun<\/span><\/td>\n          <td>60\u2013100 \u00b5m<\/td>\n          <td>High nozzle pressure; use direct-pressure blast system for adequate impact energy<\/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 7 \u2013 Grade and Grit         -->\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-and-grit\">7. Grade &amp; Grit Together: Choosing Brown vs White<\/h2>\n\n  <p>Grit size and product grade are two independent variables that must both be specified correctly. A common error is selecting the right grit but the wrong grade \u2014 for example, specifying F60 brown fused aluminum oxide for stainless steel prep, where the correct specification is F60 <em>white<\/em> fused. The selection logic is straightforward:<\/p>\n\n  <div class=\"hlh-table-wrap\">\n    <table class=\"hlh-table\">\n      <thead>\n        <tr>\n          <th>Decision Criterion<\/th>\n          <th>Specify Brown Fused (BFAO)<\/th>\n          <th>Specify White Fused (WFAO)<\/th>\n        <\/tr>\n      <\/thead>\n      <tbody>\n        <tr>\n          <td><strong>Substrate material<\/strong><\/td>\n          <td>Carbon steel, cast iron, concrete, stone<\/td>\n          <td>Stainless steel, aluminum, titanium, glass, ceramics<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>Iron contamination tolerance<\/strong><\/td>\n          <td>Acceptable (substrate itself contains iron)<\/td>\n          <td>Zero tolerance \u2014 white grade required<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>Service environment<\/strong><\/td>\n          <td>General industrial, atmospheric exposure<\/td>\n          <td>Immersion, food contact, medical, offshore, pharmaceutical<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>Governing specification<\/strong><\/td>\n          <td>SSPC, ISO 8501, general industrial<\/td>\n          <td>AMS 2431, MIL-A-22262, EN ISO 11126-7, medical OEM spec<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>Budget priority<\/strong><\/td>\n          <td>Cost-minimization \u2014 brown is 30\u201360% lower unit cost<\/td>\n          <td>Quality \/ compliance \u2014 white premium is justified<\/td>\n        <\/tr>\n      <\/tbody>\n    <\/table>\n  <\/div>\n\n  <p>For a comprehensive analysis of brown vs white aluminum oxide across 12 application scenarios, see our dedicated article: <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 8 \u2013 Pressure & Grit        -->\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=\"pressure-and-grit\">8. Blast Pressure, Nozzle &amp; Grit Interaction<\/h2>\n\n  <p>Grit size determines the maximum achievable anchor profile \u2014 but blast pressure, nozzle bore diameter, and standoff distance determine how much of that potential is realized in practice. Understanding the interaction prevents both under-performance (profile too shallow) and over-blasting (profile exceeds specification, surface roughness damages thin sections or creates uncoatable peaks).<\/p>\n\n  <h3>Pressure Effects on Profile Depth<\/h3>\n  <p>For a given grit size, increasing nozzle pressure increases both impact energy per particle and profile depth \u2014 but with diminishing returns above approximately 90 PSI (6.2 bar) for most aluminum oxide grits. Beyond the &#8220;saturation&#8221; pressure for a given grit, additional pressure primarily increases media fracture rate, dust generation, and compressor energy consumption without meaningfully increasing profile depth. The practical operating envelope for most industrial blast work is 60\u2013100 PSI (4.1\u20136.9 bar).<\/p>\n\n  <div class=\"hlh-table-wrap\">\n    <table class=\"hlh-table\">\n      <thead>\n        <tr>\n          <th>Blast Pressure<\/th>\n          <th>Typical Application<\/th>\n          <th>Effect on F36 Profile (Rz)<\/th>\n          <th>Media Consumption Rate<\/th>\n        <\/tr>\n      <\/thead>\n      <tbody>\n        <tr>\n          <td><strong>20\u201340 PSI (1.4\u20132.8 bar)<\/strong><\/td>\n          <td>Glass, light metals, dental, precision<\/td>\n          <td>~20\u201335 \u00b5m (under-driven for steel prep)<\/td>\n          <td>Niedrig<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>40\u201360 PSI (2.8\u20134.1 bar)<\/strong><\/td>\n          <td>Aluminum, sweep-blast, light cleaning<\/td>\n          <td>~28\u201342 \u00b5m<\/td>\n          <td>Low\u2013Moderate<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>60\u201380 PSI (4.1\u20135.5 bar)<\/strong><\/td>\n          <td>General steel prep, fabrication shop standard<\/td>\n          <td>~40\u201360 \u00b5m<\/td>\n          <td>M\u00e4\u00dfig<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>80\u2013100 PSI (5.5\u20136.9 bar)<\/strong><\/td>\n          <td>Heavy descaling, SP 5 \/ SP 10 specification work<\/td>\n          <td>~55\u201375 \u00b5m<\/td>\n          <td>Higher<\/td>\n        <\/tr>\n        <tr>\n          <td><strong>&gt;100 PSI (&gt;6.9 bar)<\/strong><\/td>\n          <td>Specialized heavy-duty only<\/td>\n          <td>Minimal additional gain; high media loss<\/td>\n          <td>Hoch<\/td>\n        <\/tr>\n      <\/tbody>\n    <\/table>\n  <\/div>\n\n  <h3>Nozzle Bore Size &amp; Grit Compatibility<\/h3>\n  <p>Nozzle bore diameter must be matched to grit size to prevent blockages and ensure consistent media flow. A general rule: the nozzle bore diameter should be at least four to five times the D90 particle size of the grit being used. For F36 (D90 \u2248 710 \u00b5m), a minimum 3 mm bore nozzle is required; for F12 (D90 \u2248 2,360 \u00b5m), an 8\u201310 mm bore is appropriate. Undersized nozzles cause irregular flow, pressure drop across the nozzle, and accelerated nozzle wear \u2014 all of which increase operating cost.<\/p>\n\n  <h3>Standoff Distance<\/h3>\n  <p>Increasing standoff distance reduces kinetic energy at impact and produces a shallower profile. For most blast media applications, a 20\u201330 cm standoff at perpendicular nozzle angle represents the optimal balance between profile depth and blast pattern coverage width. Angling the nozzle 10\u201315\u00b0 off perpendicular is common for heavy mill scale removal \u2014 the oblique angle increases the shearing component of impact, which assists in undercutting and detaching tightly adherent scale.<\/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 9 \u2013 Common Mistakes        -->\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=\"common-mistakes\">9. Six Common Grit Selection Mistakes<\/h2>\n\n  <p>Based on technical inquiries from industrial customers, the following specification errors account for the majority of blasting non-conformances reported to our application engineering team. Each one is preventable with the frameworks provided in this guide.<\/p>\n\n  <ol>\n    <li>\n      <strong>Specifying grit without reading the coating data sheet.<\/strong> Choosing a &#8220;standard&#8221; grit based on habit or price rather than the topcoat manufacturer&#8217;s stated anchor profile requirement is the single most common root cause of adhesion failures. Always start with the PDS.\n    <\/li>\n    <li>\n      <strong>Using brown fused aluminum oxide on stainless steel.<\/strong> Iron contamination from brown-grade media causes corrosion initiation on stainless, duplex, and austenitic alloys. Always use white fused aluminum oxide on iron-sensitive substrates. 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<\/a>.\n    <\/li>\n    <li>\n      <strong>Selecting too coarse a grit for thin-section or thin-coat work.<\/strong> Applying F24 blast media to 2 mm aluminum sheet creates substrate distortion. Applying F24 to a substrate destined for a 60 \u00b5m primer creates a profile that exceeds the coating thickness, leaving unprotected steel peaks.\n    <\/li>\n    <li>\n      <strong>Ignoring nozzle wear condition.<\/strong> A worn nozzle produces an irregular, enlarged blast pattern with reduced impact velocity \u2014 effectively behaving like a coarser but slower grit. Replace tungsten carbide nozzles when bore diameter has increased by 1\u20131.5 mm beyond nominal.\n    <\/li>\n    <li>\n      <strong>Not classifying and reclaiming spent media correctly.<\/strong> Running spent media that has degraded below the minimum particle size produces an anchor profile shallower than specified \u2014 without any visual indication at the nozzle. Track profile depth measurements, not just media age, as the criterion for top-up. Our reusability guide covers this in detail: <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?<\/a>\n    <\/li>\n    <li>\n      <strong>Using a single grit blend where a graduated mix would outperform.<\/strong> For substrates with a combination of heavy corrosion and a tight upper profile limit, a 70\/30 blend of F24 and F46 (for example) can simultaneously remove heavy contamination and moderate the peak profile height more effectively than either grit alone. Custom blends are available on request from Henglihong.\n    <\/li>\n  <\/ol>\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=\"c1ToggleFaq(this)\">\n      What does FEPA grit number actually mean?\n      <span class=\"faq-icon\">+<\/span>\n    <\/button>\n    <div class=\"faq-a\">\n      <p>The FEPA F-grit number is a nominal size designation that corresponds to a standardized particle size distribution \u2014 specifically, the combination of sieve screen openings through which the majority of the material passes. A higher FEPA number means a smaller (finer) particle size. FEPA does not specify a single exact particle size; it specifies the permissible percentages retained on a stack of calibrated sieves, defining the coarse end, the median D50 window, and the fine fraction. This distribution approach ensures consistent blasting performance across different manufacturers&#8217; products with the same grit designation.<\/p>\n    <\/div>\n  <\/div>\n\n  <div class=\"faq-item\">\n    <button class=\"faq-q\" onclick=\"c1ToggleFaq(this)\">\n      Is F36 or F46 better for general steel surface preparation?\n      <span class=\"faq-icon\">+<\/span>\n    <\/button>\n    <div class=\"faq-a\">\n      <p>For most general industrial protective coating applications \u2014 epoxy, polyurethane, zinc-rich primers \u2014 F36 is the more versatile choice. It produces an anchor profile of 40\u201365 \u00b5m, which sits in the optimal zone for most 150\u2013400 \u00b5m DFT coating systems. F46 is appropriate when the coating specification requires a shallower profile (30\u201350 \u00b5m), or when the substrate is lighter-section material where F36 creates unnecessary roughness. If you are targeting SSPC-SP 10 or SP 5 for heavy-duty immersion or offshore service, F36 is the standard first choice.<\/p>\n    <\/div>\n  <\/div>\n\n  <div class=\"faq-item\">\n    <button class=\"faq-q\" onclick=\"c1ToggleFaq(this)\">\n      Can I mix two grit sizes to get a profile between them?\n      <span class=\"faq-icon\">+<\/span>\n    <\/button>\n    <div class=\"faq-a\">\n      <p>Yes, and this is sometimes done in practice. Blending, for example, 70% F36 and 30% F24 will shift the achieved profile toward the coarser end while maintaining more of the fine-particle cutting action of F36. However, blended grit systems are harder to reclaim cleanly in a media classifier because the two fractions separate over time as the smaller particles fracture and degrade faster. For most standard applications, selecting a single grit that spans your target range is simpler and more controllable. Contact our application engineering team if you need guidance on custom blend design.<\/p>\n    <\/div>\n  <\/div>\n\n  <div class=\"faq-item\">\n    <button class=\"faq-q\" onclick=\"c1ToggleFaq(this)\">\n      What is the difference between Ra and Rz surface roughness measurements?\n      <span class=\"faq-icon\">+<\/span>\n    <\/button>\n    <div class=\"faq-a\">\n      <p>Both Ra and Rz quantify surface roughness, but they measure different aspects of the profile. <strong>Ra<\/strong> (arithmetic mean roughness) is the average absolute deviation of the surface profile from the mean line \u2014 it smooths out peaks and valleys equally. <strong>Rz<\/strong> (maximum height of profile, averaged over five sampling lengths) is more sensitive to the extreme peaks and valleys that determine a coating&#8217;s ability to mechanically bond to the substrate and the risk of peak-tenting through thin coatings. For blast media specification and coating adhesion assessment, <strong>Rz is the preferred parameter<\/strong> \u2014 it is what ISO 8503, ASTM D4417, and most protective coating data sheets specify. Ra alone is insufficient for blast prep quality control.<\/p>\n    <\/div>\n  <\/div>\n\n  <div class=\"faq-item\">\n    <button class=\"faq-q\" onclick=\"c1ToggleFaq(this)\">\n      Does humidity or temperature affect the anchor profile achieved?\n      <span class=\"faq-icon\">+<\/span>\n    <\/button>\n    <div class=\"faq-a\">\n      <p>Ambient conditions do not directly change the mechanical action of blasting, but they are critical to the quality of the prepared surface. Most coating specifications \u2014 including SSPC-SP 1 and ISO 8504-2 \u2014 require that blasting is not performed when: the steel surface temperature is less than 3 \u00b0C above the dew point; relative humidity exceeds 85%; or surface temperature is below 5 \u00b0C (conditions that prevent proper coating application even if the blast profile is correct). Blasting under these conditions produces a correctly profiled but immediately re-contaminated surface (flash rust forms within minutes), requiring re-blasting before coating. Always check dew-point conditions before commencing blast work outdoors.<\/p>\n    <\/div>\n  <\/div>\n\n  <div class=\"faq-item\">\n    <button class=\"faq-q\" onclick=\"c1ToggleFaq(this)\">\n      What is a &#8220;mil profile&#8221; and how does it relate to FEPA grit size?\n      <span class=\"faq-icon\">+<\/span>\n    <\/button>\n    <div class=\"faq-a\">\n      <p>A &#8220;mil profile&#8221; is the anchor profile depth expressed in thousandths of an inch (mils), a unit used primarily in North American coating specifications (SSPC, NACE, and US Navy specifications, for example). The conversion is straightforward: 1 mil = 25.4 \u00b5m. Therefore, a 2\u20133 mil profile specification is equivalent to 51\u201376 \u00b5m Rz \u2014 placing it squarely in the F24\u2013F36 grit range for angular aluminum oxide at standard blast pressures. The FEPA grit-to-mil relationship is not rigid (pressure and nozzle condition shift it), but as a working approximation: F36 \u2248 1.5\u20132.5 mils; F24 \u2248 2.5\u20133.5 mils; F16 \u2248 3\u20134.5 mils.<\/p>\n    <\/div>\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  <!-- CTA                                -->\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  <div class=\"cta-block\">\n    <h2>Need Help Specifying the Right Grit?<\/h2>\n    <p>Our application engineering team at Jiangsu Henglihong Technology can review your coating specification and substrate requirements, and recommend the optimal grit size and grade for your project \u2014 with sample quantities available for trial evaluation.<\/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  <!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\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  <!-- EXPLORE MORE                       -->\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 style=\"margin-top:2.8rem;\">Related Resources<\/h2>\n  <p>Continue building your aluminum oxide expertise 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\/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\/aluminum-oxide-for-glass-etching-frosting\/\" target=\"_blank\">Aluminum Oxide for Glass Etching &amp; Frosting<\/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<!-- FAQ accordion script -->\n<script>\nfunction c1ToggleFaq(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 Grit Size Chart &amp; Selection Guide A complete  [&#8230;]<\/p>","protected":false},"author":1,"featured_media":12664,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[62,177,138],"tags":[],"class_list":["post-12629","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-material","category-resource"],"_links":{"self":[{"href":"https:\/\/hlh-js.com\/de\/wp-json\/wp\/v2\/posts\/12629","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hlh-js.com\/de\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hlh-js.com\/de\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hlh-js.com\/de\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/hlh-js.com\/de\/wp-json\/wp\/v2\/comments?post=12629"}],"version-history":[{"count":3,"href":"https:\/\/hlh-js.com\/de\/wp-json\/wp\/v2\/posts\/12629\/revisions"}],"predecessor-version":[{"id":12679,"href":"https:\/\/hlh-js.com\/de\/wp-json\/wp\/v2\/posts\/12629\/revisions\/12679"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hlh-js.com\/de\/wp-json\/wp\/v2\/media\/12664"}],"wp:attachment":[{"href":"https:\/\/hlh-js.com\/de\/wp-json\/wp\/v2\/media?parent=12629"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hlh-js.com\/de\/wp-json\/wp\/v2\/categories?post=12629"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hlh-js.com\/de\/wp-json\/wp\/v2\/tags?post=12629"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}