{"id":13197,"date":"2026-05-28T01:49:58","date_gmt":"2026-05-28T01:49:58","guid":{"rendered":"https:\/\/hlh-js.com\/?p=13197"},"modified":"2026-05-28T01:49:58","modified_gmt":"2026-05-28T01:49:58","slug":"sand-blasted-aluminum-pre-anodizing-bead-blast-specifications-mil-a-8625","status":"publish","type":"post","link":"https:\/\/hlh-js.com\/de\/resource\/blog\/sand-blasted-aluminum-pre-anodizing-bead-blast-specifications-mil-a-8625\/","title":{"rendered":"Sand Blasted Aluminum: Pre-Anodizing Bead Blast Specifications (MIL-A-8625)"},"content":{"rendered":"<div class=\"hlh-art\">\n\n<style>\n  .hlh-art {\n    font-family: -apple-system, BlinkMacSystemFont, \"Segoe UI\", \"Helvetica Neue\", Arial, sans-serif;\n    color: #1f2a37; line-height: 1.72; font-size: 16.5px;\n    max-width: 1080px; margin: 0 auto; padding: 0 4px; box-sizing: border-box;\n  }\n  .hlh-art *, .hlh-art *::before, .hlh-art *::after { box-sizing: border-box; }\n  .hlh-art h1, .hlh-art h2, .hlh-art h3, .hlh-art h4 {\n    color: #0f3057; 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border: none; margin-top: 0; font-size: 1.45rem; position: relative; padding: 0; }\n  .hlh-art-cta p { color: #d6dee8; max-width: 620px; margin: 8px auto 22px; position: relative; }\n  .hlh-art-cta-button {\n    display: inline-block; background: #e8782e; color: #fff !important;\n    padding: 13px 32px; border-radius: 50px; font-weight: 700;\n    font-size: 0.98rem; border: none !important;\n    box-shadow: 0 8px 22px rgba(232,120,46,0.35); position: relative;\n    transition: all 0.2s ease;\n  }\n  .hlh-art-cta-button:hover { background: #c75d12; color: #fff !important; transform: translateY(-2px); }\n\n  .hlh-art-pillarback {\n    background: #eef3f9; border-left: 4px solid #0f3057;\n    padding: 16px 22px; border-radius: 6px; margin: 24px 0;\n    font-size: 0.95rem;\n  }\n  .hlh-art-pillarback strong { color: #0f3057; }\n\n  @media (max-width: 780px) {\n    .hlh-art { font-size: 16px; }\n    .hlh-art h1, .hlh-art-hero h1 { font-size: 1.7rem; }\n    .hlh-art h2 { font-size: 1.3rem; }\n    .hlh-art-hero { padding: 30px 22px; }\n    .hlh-art-toc ol { columns: 1; }\n    .hlh-art-steps { grid-template-columns: repeat(2, 1fr); }\n    .hlh-art-grid2, .hlh-art-grid3, .hlh-art-related-grid { grid-template-columns: 1fr; }\n    .hlh-art-cta { padding: 30px 22px; }\n  }\n<\/style>\n\n<section class=\"hlh-art-hero\">\n  <div class=\"hlh-art-meta-row\">\n    <span class=\"hlh-art-tag\">Aluminium<\/span>\n    <span class=\"hlh-art-date\">Published &middot; May 2026<\/span>\n  <\/div>\n  <h1>Sand Blasted Aluminum: Pre-Anodizing Bead Blast Specifications (MIL-A-8625)<\/h1>\n  <p class=\"hlh-art-lede\">Aluminum is softer than steel and easily over-blasted. This guide covers compatible media, the MIL-A-8625 pre-anodizing specification, bead blast windows for uniform matte anodized finishes, and the defects to avoid on aluminum substrates.<\/p>\n<\/section>\n\n<aside class=\"hlh-art-summary\">\n  <h2>Key Takeaways<\/h2>\n  <ul>\n    <li>Glass bead (#100\u2013#170) is the dominant media for aluminum; aggressive media causes warping and over-blasting.<\/li>\n    <li>MIL-A-8625 is the governing specification for anodized aluminum coatings, with implicit surface prep requirements.<\/li>\n    <li>Bead blast pressure on aluminum runs 40\u201370 psi \u2014 lower than steel.<\/li>\n    <li>Uniform pre-anodize matte finish targets Ra 0.6\u20131.2 \u00b5m depending on visual specification.<\/li>\n  <\/ul>\n<\/aside>\n\n<nav class=\"hlh-art-toc\" aria-label=\"Inhalts\u00fcbersicht\">\n  <h2>Table of Contents<\/h2>\n  <ol>\n    <li><a href=\"#intro\">Why Aluminum Demands a Different Approach<\/a><\/li>\n    <li><a href=\"#media\">Compatible Media for Aluminum<\/a><\/li>\n    <li><a href=\"#mil-a-8625\">MIL-A-8625 Specification<\/a><\/li>\n    <li><a href=\"#parameters\">Bead Blast Parameters for Aluminum<\/a><\/li>\n    <li><a href=\"#aerospace\">Luft- und Raumfahrtanwendungen<\/a><\/li>\n    <li><a href=\"#defects\">Common Aluminum Defects<\/a><\/li>\n  <\/ol>\n<\/nav>\n\n<section id=\"intro\" class=\"hlh-art-section\">\n  <h2>Why Aluminum Demands a Different Approach<\/h2>\n  <p>Aluminum has roughly half the hardness of mild steel (95 HB vs 150 HB). This means identical blast parameters produce significantly deeper craters, faster material removal, and higher risk of distortion in thin sections. Specifying &#8220;sandblasting&#8221; for aluminum the same way you would for steel produces over-blasted, warped, contaminated parts.<\/p>\n\n<p>This article covers the specific aluminum workflow. For the general sand blasting framework, see the <a href=\"https:\/\/hlh-js.com\/resource\/blog\/sand-blasted-surface\/\" target=\"_blank\" rel=\"noopener\">pillar guide on sand blasted surface<\/a>.<\/p>\n<\/section>\n\n<section id=\"media\" class=\"hlh-art-section\">\n  <h2>Compatible Media for Aluminum<\/h2>\n  <div class=\"hlh-art-grid2\">\n  <div class=\"hlh-art-card\">\n    <h4>Preferred<\/h4>\n    <ul>\n      <li><strong>Glass bead #100\u2013#170<\/strong> \u2014 uniform cosmetic matte<\/li>\n      <li><strong>Aluminum oxide #120\u2013#180<\/strong> \u2014 when additional anchor pattern is required<\/li>\n      <li><strong>Ceramic bead<\/strong> \u2014 peening fasteners<\/li>\n    <\/ul>\n  <\/div>\n  <div class=\"hlh-art-card accent\">\n    <h4>Avoid on aluminum<\/h4>\n    <ul>\n      <li><strong>Steel grit \/ steel shot<\/strong> \u2014 ferrous embedment, galvanic corrosion<\/li>\n      <li><strong>Coarse aluminum oxide<\/strong> \u2014 over-blast, distortion<\/li>\n      <li><strong>Quarzsand<\/strong> \u2014 silicosis risk and over-aggressive<\/li>\n    <\/ul>\n  <\/div>\n<\/div>\n\n<p>Like stainless, aluminum cannot tolerate iron contamination from steel media. The galvanic couple between embedded steel and the surrounding aluminum drives rapid pitting corrosion in service.<\/p>\n<\/section>\n\n<section id=\"mil-a-8625\" class=\"hlh-art-section\">\n  <h2>MIL-A-8625 Specification<\/h2>\n  <p>MIL-A-8625 (now superseded by MIL-PRF-8625F but still widely referenced) covers anodic coatings for aluminum and aluminum alloys. It defines three primary types:<\/p>\n\n<div class=\"hlh-art-table-wrap\">\n<table>\n  <thead><tr><th>Typ<\/th><th>Prozess<\/th><th>Typical Use<\/th><\/tr><\/thead>\n  <tbody>\n    <tr><td><strong>Type I<\/strong><\/td><td>Chromic acid anodize<\/td><td>Aerospace structural, paint base<\/td><\/tr>\n    <tr><td><strong>Type II<\/strong><\/td><td>Sulfuric acid anodize<\/td><td>General industrial, decorative dyed<\/td><\/tr>\n    <tr><td><strong>Type III<\/strong><\/td><td>Hardcoat anodize<\/td><td>Wear-resistant, military hardware<\/td><\/tr>\n  <\/tbody>\n<\/table>\n<\/div>\n\n<p>The pre-anodize surface preparation requirements are typically specified in supplemental drawings or quality documents rather than MIL-A-8625 itself. The de facto industry practice is glass bead blasting at controlled pressure to produce a uniform matte texture that anodizes into the distinctive premium matte finish seen on consumer electronics and aerospace structural panels.<\/p>\n<\/section>\n\n<section id=\"parameters\" class=\"hlh-art-section\">\n  <h2>Bead Blast Parameters for Aluminum<\/h2>\n  <div class=\"hlh-art-table-wrap\">\n<table>\n  <thead><tr><th>Parameter<\/th><th>Aluminum Setting<\/th><th>Steel Setting<\/th><\/tr><\/thead>\n  <tbody>\n    <tr><td>Pressure (at nozzle)<\/td><td><strong>40\u201370 psi<\/strong><\/td><td>80\u2013110 psi<\/td><\/tr>\n    <tr><td>Standoff distance<\/td><td>250\u2013350 mm<\/td><td>250\u2013350 mm<\/td><\/tr>\n    <tr><td>Impact angle<\/td><td>75\u00b0<\/td><td>75\u00b0<\/td><\/tr>\n    <tr><td>Media (typical)<\/td><td>Glass bead #100\u2013#170<\/td><td>Aluminum oxide #80<\/td><\/tr>\n    <tr><td>Resulting Ra<\/td><td>0.6\u20131.2 \u00b5m<\/td><td>1.8\u20132.3 \u00b5m<\/td><\/tr>\n  <\/tbody>\n<\/table>\n<\/div>\n\n<p>The lower pressure on aluminum is essential. At 90 psi, glass bead on 6061-T6 produces visible distortion in sections below 3 mm thickness. At 60 psi, the same media on the same alloy produces clean uniform matte without distortion.<\/p>\n\n<div class=\"hlh-art-callout hlh-art-callout-tip\">\n  <div class=\"hlh-art-callout-title\">Tip for Thin Sheet<\/div>\n  <p>For aluminum below 1.5 mm thickness, consider rotary blast tables or oscillating racks that minimize dwell time in any single location. Static blasting on thin aluminum commonly produces ripple-style distortion.<\/p>\n<\/div>\n<\/section>\n\n<section id=\"aerospace\" class=\"hlh-art-section\">\n  <h2>Luft- und Raumfahrtanwendungen<\/h2>\n  <p>Aerospace structural aluminum (7075-T6, 2024-T3, 6061-T6) is routinely sand blasted before primer application:<\/p>\n\n<ul>\n  <li>Glass bead #150 at 50 psi produces Ra ~0.7 \u00b5m \u2014 preferred for primary structure<\/li>\n  <li>Aluminum oxide #180 at 40 psi produces Ra ~1.0 \u00b5m \u2014 used where additional anchor is required<\/li>\n  <li>Subsequent treatments include chromic acid anodize, sulfuric acid anodize, or chromate conversion coating<\/li>\n<\/ul>\n\n<p>For the broader process and comparison context, see our guide on <a href=\"https:\/\/hlh-js.com\/resource\/blog\/sandblasting-vs-shot-blasting-vs-bead-blasting-surface-differences-explained\/\" target=\"_blank\" rel=\"noopener\">sandblasting vs shot blasting vs bead blasting<\/a>.<\/p>\n<\/section>\n\n<section id=\"defects\" class=\"hlh-art-section\">\n  <h2>Common Aluminum Defects<\/h2>\n  <ul>\n  <li><strong>Warping\/distortion<\/strong> \u2014 excessive pressure on thin sheet<\/li>\n  <li><strong>Embedded media<\/strong> \u2014 common with worn glass bead<\/li>\n  <li><strong>Iron contamination<\/strong> \u2014 from shared equipment with carbon steel work<\/li>\n  <li><strong>Galled surface<\/strong> \u2014 from over-dwell on soft alloys (1100, 3003)<\/li>\n  <li><strong>Inconsistent matte appearance<\/strong> \u2014 operator overlap variation<\/li>\n<\/ul>\n\n<p>Defects and remediation for all materials are covered in our reference on <a href=\"https:\/\/hlh-js.com\/resource\/blog\/common-sand-blasted-surface-defects-shadowing-embedment-flash-rust\/\" target=\"_blank\" rel=\"noopener\">common sand blasted surface defects<\/a>.<\/p>\n<\/section>\n\n<aside class=\"hlh-art-pillarback\">\n  <strong>Looking for the complete picture?<\/strong> This article is part of our broader resource on sand blasted surface specification, standards, and applications. Read the full <a href=\"https:\/\/hlh-js.com\/resource\/blog\/sand-blasted-surface\/\" target=\"_blank\" rel=\"noopener\">pillar guide to sand blasted surface<\/a> for the complete process, Ra\/Rz reference, four-standard cross-reference, and material-by-material guidance.\n<\/aside>\n\n<section class=\"hlh-art-related\">\n  <h3>Related Articles<\/h3>\n  <div class=\"hlh-art-related-grid\">\n    <div class=\"hlh-art-related-card\">\n      <a href=\"https:\/\/hlh-js.com\/resource\/blog\/sandblasting-vs-shot-blasting-vs-bead-blasting-surface-differences-explained\/\" target=\"_blank\" rel=\"noopener\">Sandblasting vs Shot Blasting vs Bead Blasting<\/a>\n    <\/div>\n    <div class=\"hlh-art-related-card\">\n      <a href=\"https:\/\/hlh-js.com\/resource\/blog\/sand-blasted-stainless-steel-finish-grades-passivation-hygiene-standards\/\" target=\"_blank\" rel=\"noopener\">Sand Blasted Stainless Steel<\/a>\n    <\/div>\n    <div class=\"hlh-art-related-card\">\n      <a href=\"https:\/\/hlh-js.com\/resource\/blog\/how-sandblasting-works-pressure-nozzle-distance-angle-parameters\/\" target=\"_blank\" rel=\"noopener\">How Sandblasting Works: Pressure, Nozzle Distance &#038; Angle Parameters<\/a>\n    <\/div>\n    <div class=\"hlh-art-related-card\">\n      <a href=\"https:\/\/hlh-js.com\/resource\/blog\/common-sand-blasted-surface-defects-shadowing-embedment-flash-rust\/\" target=\"_blank\" rel=\"noopener\">Common Sand Blasted Surface Defects<\/a>\n    <\/div>\n  <\/div>\n<\/section>\n\n<section id=\"faq\" class=\"hlh-art-section hlh-art-faq\">\n  <h2>H\u00e4ufig gestellte Fragen<\/h2>\n  <details>\n    <summary>Can you sandblast aluminum?<\/summary>\n    <div class=\"hlh-art-faq-body\"><p>Yes, but with adjusted parameters. Glass bead is the dominant media; pressure runs 40\u201370 psi (vs 80\u2013110 psi for steel). Aluminum oxide can be used when additional anchor pattern is needed. Steel grit and steel shot must never be used due to galvanic corrosion risk.<\/p><\/div>\n  <\/details>\n  <details>\n    <summary>What media should I use to bead blast aluminum?<\/summary>\n    <div class=\"hlh-art-faq-body\"><p>Glass bead #100\u2013#170 is the standard for cosmetic and pre-anodize finishes. Aluminum oxide #120\u2013#180 is used when more anchor pattern is required for downstream coating.<\/p><\/div>\n  <\/details>\n  <details>\n    <summary>What pressure should I use on aluminum?<\/summary>\n    <div class=\"hlh-art-faq-body\"><p>40\u201370 psi at the nozzle. The lower pressure (vs 80\u2013110 psi for steel) prevents over-blasting, warping, and excessive surface work. Below 40 psi, blasting becomes inefficient; above 70 psi, distortion risk grows quickly on thin sheet.<\/p><\/div>\n  <\/details>\n  <details>\n    <summary>What is the typical Ra for bead-blasted aluminum?<\/summary>\n    <div class=\"hlh-art-faq-body\"><p>0.6\u20131.2 \u00b5m with glass bead #100\u2013#170 at 50\u201360 psi. Premium consumer electronics often target the 0.5\u20130.7 \u00b5m range; aerospace pre-anodize targets the 0.8\u20131.0 \u00b5m range.<\/p><\/div>\n  <\/details>\n  <details>\n    <summary>Why does my aluminum warp during blasting?<\/summary>\n    <div class=\"hlh-art-faq-body\"><p>Most often, pressure is too high or dwell time too long. Aluminum&#8217;s lower hardness means more energy goes into plastic deformation rather than substrate removal. Reduce pressure to 50\u201360 psi and increase traverse speed.<\/p><\/div>\n  <\/details>\n<\/section>\n\n<section class=\"hlh-art-cta\">\n  <h2>Request an Abrasive Blasting Media Sample<\/h2>\n  <p>Jiangsu Henglihong Technology Co., Ltd. supplies certified aluminum oxide, garnet, glass bead, steel grit, and steel shot to global industrial buyers. Request a sample with full batch documentation for technical evaluation.<\/p>\n  <a class=\"hlh-art-cta-button\" href=\"https:\/\/hlh-js.com\/contact\/\" target=\"_blank\" rel=\"noopener\">Request a Sample &rarr;<\/a>\n<\/section>\n\n<script type=\"application\/ld+json\">{\n    \"@context\": \"https:\\\/\\\/schema.org\",\n    \"@graph\": [\n        {\n            \"@type\": \"Article\",\n            \"headline\": \"Sand Blasted Aluminum: Pre-Anodizing Bead Blast Specifications (MIL-A-8625)\",\n            \"description\": \"Aluminum is softer than steel and easily over-blasted. This guide covers compatible media, the MIL-A-8625 pre-anodizing specification, bead blast windows for uniform matte anodized finishes, and the defects to avoid on aluminum substrates.\",\n            \"datePublished\": \"2026-05-01\",\n            \"dateModified\": \"2026-05-01\",\n            \"author\": {\n                \"@type\": \"Organization\",\n                \"name\": \"Jiangsu Henglihong Technology Co., Ltd.\",\n                \"url\": \"https:\\\/\\\/hlh-js.com\\\/\"\n            },\n            \"publisher\": {\n                \"@type\": \"Organization\",\n                \"name\": \"Jiangsu Henglihong Technology Co., Ltd.\",\n                \"url\": \"https:\\\/\\\/hlh-js.com\\\/\"\n            },\n            \"mainEntityOfPage\": \"https:\\\/\\\/hlh-js.com\\\/resource\\\/blog\\\/sand-blasted-aluminum-pre-anodizing-bead-blast-specifications-mil-a-8625\\\/\"\n        },\n        {\n            \"@type\": \"FAQPage\",\n            \"mainEntity\": [\n                {\n                    \"@type\": \"Question\",\n                    \"name\": \"Can you sandblast aluminum?\",\n                    \"acceptedAnswer\": {\n                        \"@type\": \"Answer\",\n                        \"text\": \"Yes, but with adjusted parameters. 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