{"id":13194,"date":"2026-05-28T01:49:53","date_gmt":"2026-05-28T01:49:53","guid":{"rendered":"https:\/\/hlh-js.com\/?p=13194"},"modified":"2026-05-28T01:49:53","modified_gmt":"2026-05-28T01:49:53","slug":"sand-blasted-stainless-steel-finish-grades-passivation-hygiene-standards","status":"publish","type":"post","link":"https:\/\/hlh-js.com\/ja\/resource\/blog\/sand-blasted-stainless-steel-finish-grades-passivation-hygiene-standards\/","title":{"rendered":"Sand Blasted Stainless Steel: Finish Grades, Passivation &amp; Hygiene Standards"},"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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grid-template-columns: repeat(2, 1fr); gap: 12px; margin-top: 14px; }\n  .hlh-art-related-card {\n    background: #fff; border: 1px solid #e2e5ea; border-radius: 8px;\n    padding: 14px 16px; transition: all 0.2s ease;\n  }\n  .hlh-art-related-card:hover { border-color: #e8782e; box-shadow: 0 6px 16px rgba(232,120,46,0.12); transform: translateY(-2px); }\n  .hlh-art-related-card a { color: #0f3057; border: none; font-weight: 600; font-size: 0.92rem; display: block; }\n  .hlh-art-related-card a:hover { color: #c75d12; }\n\n  .hlh-art-cta {\n    background: linear-gradient(135deg, #0f3057 0%, #082244 100%);\n    color: #fff; padding: 38px 36px; border-radius: 14px;\n    margin: 36px 0 16px; text-align: center; position: relative; overflow: hidden;\n  }\n  .hlh-art-cta::before {\n    content: \"\"; position: absolute; bottom: -60px; left: -60px;\n    width: 200px; height: 200px;\n    background: radial-gradient(circle, rgba(232,120,46,0.18), transparent 70%);\n    border-radius: 50%;\n  }\n  .hlh-art-cta h2 { color: #fff; 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\">Stainless Steel<\/span>\n    <span class=\"hlh-art-date\">Published &middot; May 2026<\/span>\n  <\/div>\n  <h1>Sand Blasted Stainless Steel: Finish Grades, Passivation &#038; Hygiene Standards<\/h1>\n  <p class=\"hlh-art-lede\">Stainless steel requires careful media selection to avoid iron contamination and a specific post-blast workflow to maintain corrosion resistance. This guide covers compatible media, ASTM A967 passivation, EHEDG and 3-A hygiene standards, and finish specifications for architectural, food, and pharmaceutical applications.<\/p>\n<\/section>\n\n<aside class=\"hlh-art-summary\">\n  <h2>Key Takeaways<\/h2>\n  <ul>\n    <li>Steel media (grit and shot) must never be used on stainless \u2014 iron contamination destroys corrosion resistance.<\/li>\n    <li>Glass bead and stainless-compatible aluminum oxide are the standard media; certified low-iron garnet is acceptable.<\/li>\n    <li>Post-blast passivation per ASTM A967 restores the chromium oxide layer; mandatory for hygiene-critical applications.<\/li>\n    <li>Hygiene standards (EHEDG, 3-A Sanitary, FDA) typically require Ra \u2264 0.8 \u00b5m for food-contact surfaces.<\/li>\n  <\/ul>\n<\/aside>\n\n<nav class=\"hlh-art-toc\" aria-label=\"\u76ee\u6b21\">\n  <h2>Table of Contents<\/h2>\n  <ol>\n    <li><a href=\"#intro\">Why Stainless Steel Demands Special Care<\/a><\/li>\n    <li><a href=\"#media\">Compatible and Prohibited Media<\/a><\/li>\n    <li><a href=\"#passivation\">Passivation per ASTM A967<\/a><\/li>\n    <li><a href=\"#hygiene\">Hygiene Standards: EHEDG, 3-A, FDA<\/a><\/li>\n    <li><a href=\"#architectural\">Architectural Stainless Applications<\/a><\/li>\n    <li><a href=\"#sequence\">Complete Process Sequence<\/a><\/li>\n  <\/ol>\n<\/nav>\n\n<section id=\"intro\" class=\"hlh-art-section\">\n  <h2>Why Stainless Steel Demands Special Care<\/h2>\n  <p>Stainless steel derives its corrosion resistance from a thin, self-healing chromium oxide layer at the surface. Any process that contaminates the surface with iron or damages the oxide layer compromises corrosion performance. Sand blasting can do both \u2014 which is why media selection and post-treatment matter.<\/p>\n\n<p>For the general specification 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 and Prohibited Media<\/h2>\n  <div class=\"hlh-art-grid2\">\n  <div class=\"hlh-art-card\">\n    <h4>Recommended<\/h4>\n    <ul>\n      <li><strong>Glass bead<\/strong> \u2014 cosmetic matte, no contamination<\/li>\n      <li><strong>\u9178\u5316\u30a2\u30eb\u30df\u30cb\u30a6\u30e0<\/strong> \u2014 pre-coating prep, white certified<\/li>\n      <li><strong>Ceramic bead<\/strong> \u2014 peening and finishing<\/li>\n      <li><strong>\u30ac\u30fc\u30cd\u30c3\u30c8<\/strong> \u2014 certified low-iron only<\/li>\n    <\/ul>\n  <\/div>\n  <div class=\"hlh-art-card accent\">\n    <h4>Prohibited<\/h4>\n    <ul>\n      <li><strong>\u30b9\u30c1\u30fc\u30eb\u30b0\u30ea\u30c3\u30c8<\/strong> \u2014 ferrous embedment<\/li>\n      <li><strong>\u30b9\u30c1\u30fc\u30eb\u30b7\u30e7\u30c3\u30c8<\/strong> \u2014 ferrous embedment<\/li>\n      <li><strong>Mixed-use media<\/strong> \u2014 cross-contamination from prior carbon steel work<\/li>\n      <li><strong>Recycled media<\/strong> from carbon steel operations<\/li>\n    <\/ul>\n  <\/div>\n<\/div>\n\n<p>Iron contamination from steel media is not always immediately visible but causes a characteristic &#8220;rust freckling&#8221; pattern within weeks of exposure to humidity. The damage is unrepairable without re-blasting and re-passivating. Jiangsu Henglihong Technology Co., Ltd. supplies certified stainless-compatible aluminum oxide, glass bead, and low-iron garnet with batch documentation.<\/p>\n<\/section>\n\n<section id=\"passivation\" class=\"hlh-art-section\">\n  <h2>Passivation per ASTM A967<\/h2>\n  <p>Passivation is the chemical treatment that restores the chromium oxide layer after mechanical disturbance. ASTM A967 \/ A967M-17 is the governing US standard; equivalent international standards include ASTM A380 and AMS-QQ-P-35.<\/p>\n\n<div class=\"hlh-art-table-wrap\">\n<table>\n  <thead><tr><th>Method<\/th><th>\u30bd\u30ea\u30e5\u30fc\u30b7\u30e7\u30f3<\/th><th>Use Case<\/th><\/tr><\/thead>\n  <tbody>\n    <tr><td>Nitric 1<\/td><td>20&ndash;25% HNO\u2083 at 49&ndash;71\u00b0C<\/td><td>General 300-series passivation<\/td><\/tr>\n    <tr><td>Nitric 2<\/td><td>20&ndash;25% HNO\u2083 + sodium dichromate<\/td><td>Aggressive cleaning; declining use<\/td><\/tr>\n    <tr><td>Citric 1, 2, 3<\/td><td>Citric acid solutions<\/td><td>Modern preferred method, environmentally favored<\/td><\/tr>\n  <\/tbody>\n<\/table>\n<\/div>\n\n<p>The complete passivation workflow for blasted stainless: blast \u2192 DI water rinse \u2192 passivate per ASTM A967 \u2192 DI water rinse \u2192 dry. Verification is typically by copper sulfate test (ASTM A380) or salt spray (ASTM B117).<\/p>\n<\/section>\n\n<section id=\"hygiene\" class=\"hlh-art-section\">\n  <h2>Hygiene Standards: EHEDG, 3-A, FDA<\/h2>\n  <p>For food, dairy, pharmaceutical, and biotechnology applications, blasted stainless surfaces must meet standards beyond corrosion performance:<\/p>\n\n<ul>\n  <li><strong>EHEDG<\/strong> (European Hygienic Engineering &amp; Design Group) \u2014 Doc 8 specifies Ra \u2264 0.8 \u00b5m for product-contact surfaces.<\/li>\n  <li><strong>3-A Sanitary Standards<\/strong> \u2014 US dairy and food equipment; typically Ra \u2264 0.8 \u00b5m.<\/li>\n  <li><strong>FDA 21 CFR 177<\/strong> \u2014 food-contact material requirements; no specific Ra mandate but smooth surfaces preferred.<\/li>\n  <li><strong>ASME BPE<\/strong> (BioProcessing Equipment) \u2014 pharmaceutical; SF1 = Ra \u2264 0.51 \u00b5m; SF4 = Ra \u2264 0.38 \u00b5m.<\/li>\n<\/ul>\n\n<p>Achieving Ra \u2264 0.8 \u00b5m consistently from blasting alone requires fine glass bead (#170 or finer) at controlled pressure. Many hygiene-critical applications combine fine bead blast with subsequent electropolish to reach Ra \u2264 0.4 \u00b5m. For comparison with brushed and polished alternatives, see our <a href=\"https:\/\/hlh-js.com\/resource\/blog\/sand-blasted-finish-vs-brushed-finish-vs-polished-side-by-side-comparison\/\" target=\"_blank\" rel=\"noopener\">sand blasted finish vs brushed vs polished comparison<\/a>.<\/p>\n<\/section>\n\n<section id=\"architectural\" class=\"hlh-art-section\">\n  <h2>Architectural Stainless Applications<\/h2>\n  <p>Architectural specifications for stainless commonly call for a uniform matte appearance hiding fingerprints and handling marks:<\/p>\n\n<ul>\n  <li><strong>Glass bead blast<\/strong> \u2014 classic matte; Ra 0.5\u20130.8 \u00b5m; cladding, balustrades, signage.<\/li>\n  <li><strong>Bead blast + linear brush<\/strong> \u2014 combination offering blast uniformity with subtle directional grain.<\/li>\n  <li><strong>Aluminum oxide light blast<\/strong> \u2014 more textured; Ra 1.0\u20131.3 \u00b5m; for additional anchor pattern under clear coats.<\/li>\n<\/ul>\n\n<p>Architectural stainless is typically passivated and left bare. UV-stable clear coats are occasionally specified in coastal environments to protect against tea-staining on 304-grade stainless.<\/p>\n<\/section>\n\n<section id=\"sequence\" class=\"hlh-art-section\">\n  <h2>Complete Process Sequence<\/h2>\n  <div class=\"hlh-art-steps\">\n  <div class=\"hlh-art-step\">\n    <div class=\"hlh-art-step-num\">1<\/div>\n    <div class=\"hlh-art-step-title\">Pre-Clean<\/div>\n    <div class=\"hlh-art-step-desc\">Solvent wipe to remove oils. Critical to prevent contaminant smearing.<\/div>\n  <\/div>\n  <div class=\"hlh-art-step\">\n    <div class=\"hlh-art-step-num\">2<\/div>\n    <div class=\"hlh-art-step-title\">Blast<\/div>\n    <div class=\"hlh-art-step-desc\">Glass bead or stainless-compatible aluminum oxide at 70\u201390 psi. Dedicated equipment.<\/div>\n  <\/div>\n  <div class=\"hlh-art-step\">\n    <div class=\"hlh-art-step-num\">3<\/div>\n    <div class=\"hlh-art-step-title\">Rinse<\/div>\n    <div class=\"hlh-art-step-desc\">DI water rinse to remove media residue and abrasive fines.<\/div>\n  <\/div>\n  <div class=\"hlh-art-step\">\n    <div class=\"hlh-art-step-num\">4<\/div>\n    <div class=\"hlh-art-step-title\">Passivate<\/div>\n    <div class=\"hlh-art-step-desc\">Citric or nitric acid bath per ASTM A967; rinse and dry.<\/div>\n  <\/div>\n<\/div>\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\/sand-blasted-finish-vs-brushed-finish-vs-polished-side-by-side-comparison\/\" target=\"_blank\" rel=\"noopener\">Sand Blasted Finish vs Brushed vs Polished<\/a>\n    <\/div>\n    <div class=\"hlh-art-related-card\">\n      <a href=\"https:\/\/hlh-js.com\/resource\/blog\/sand-blasted-titanium-for-medical-implants-sa-roughness-for-osseointegration\/\" target=\"_blank\" rel=\"noopener\">Sand Blasted Titanium for Medical Implants<\/a>\n    <\/div>\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-surface-inspection-acceptance-visual-profile-cleanliness\/\" target=\"_blank\" rel=\"noopener\">Sand Blasted Surface Inspection &#038; Acceptance<\/a>\n    <\/div>\n  <\/div>\n<\/section>\n\n<section id=\"faq\" class=\"hlh-art-section hlh-art-faq\">\n  <h2>\u3088\u304f\u3042\u308b\u8cea\u554f<\/h2>\n  <details>\n    <summary>Can you use steel grit on stainless steel?<\/summary>\n    <div class=\"hlh-art-faq-body\"><p>No. Steel grit and steel shot leave iron particles embedded in the stainless surface, which causes rust freckling within weeks. The damage is permanent without re-blasting with stainless-compatible media and re-passivating.<\/p><\/div>\n  <\/details>\n  <details>\n    <summary>Is passivation required after sandblasting stainless steel?<\/summary>\n    <div class=\"hlh-art-faq-body\"><p>For hygiene-critical applications (food, pharmaceutical, medical) passivation is mandatory. For general architectural use, passivation is recommended but not always specified. Passivation restores the chromium oxide layer disrupted by blasting.<\/p><\/div>\n  <\/details>\n  <details>\n    <summary>What Ra is required for food-contact stainless surfaces?<\/summary>\n    <div class=\"hlh-art-faq-body\"><p>EHEDG and 3-A standards typically require Ra \u2264 0.8 \u00b5m. ASME BPE for pharmaceutical applications specifies Ra \u2264 0.51 \u00b5m (SF1) or \u2264 0.38 \u00b5m (SF4).<\/p><\/div>\n  <\/details>\n  <details>\n    <summary>Can I use the same blasting equipment for stainless and carbon steel?<\/summary>\n    <div class=\"hlh-art-faq-body\"><p>Not recommended. Even after cleaning, residual ferrous contamination in the equipment and media can transfer to stainless workpieces. Dedicated stainless-only equipment or thorough decontamination protocols are required.<\/p><\/div>\n  <\/details>\n  <details>\n    <summary>What is the difference between citric and nitric passivation?<\/summary>\n    <div class=\"hlh-art-faq-body\"><p>Both restore the chromium oxide layer. Nitric is the traditional method, faster but more hazardous and environmentally regulated. Citric is the modern preferred method \u2014 gentler, environmentally favorable, and effective for most stainless grades.<\/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 Stainless Steel: Finish Grades, Passivation & Hygiene Standards\",\n            \"description\": \"Stainless steel requires careful media selection to avoid iron contamination and a specific post-blast workflow to maintain corrosion resistance. This guide covers compatible media, ASTM A967 passivation, EHEDG and 3-A hygiene standards, and finish specifications for architectural, food, and pharmaceutical applications.\",\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-stainless-steel-finish-grades-passivation-hygiene-standards\\\/\"\n        },\n        {\n            \"@type\": \"FAQPage\",\n            \"mainEntity\": [\n                {\n                    \"@type\": \"Question\",\n                    \"name\": \"Can you use steel grit on stainless steel?\",\n                    \"acceptedAnswer\": {\n                        \"@type\": \"Answer\",\n                        \"text\": \"No. Steel grit and steel shot leave iron particles embedded in the stainless surface, which causes rust freckling within weeks. 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