{"id":13185,"date":"2026-05-28T01:49:37","date_gmt":"2026-05-28T01:49:37","guid":{"rendered":"https:\/\/hlh-js.com\/?p=13185"},"modified":"2026-05-28T01:49:37","modified_gmt":"2026-05-28T01:49:37","slug":"nace-1-2-3-4-blast-cleaning-standards-explained-with-visual-references","status":"publish","type":"post","link":"https:\/\/hlh-js.com\/fr\/resource\/blog\/nace-1-2-3-4-blast-cleaning-standards-explained-with-visual-references\/","title":{"rendered":"NACE 1\/2\/3\/4 Blast Cleaning Standards Explained with Visual References"},"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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}\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\">Standards Reference<\/span>\n    <span class=\"hlh-art-date\">Published &middot; May 2026<\/span>\n  <\/div>\n  <h1>NACE 1\/2\/3\/4 Blast Cleaning Standards Explained with Visual References<\/h1>\n  <p class=\"hlh-art-lede\">The four NACE blast cleaning grades \u2014 used widely in pipeline, offshore, and petrochemical specifications \u2014 explained with visual criteria, joint NACE\/SSPC mapping, and guidance on when NACE is cited rather than SSPC.<\/p>\n<\/section>\n\n<aside class=\"hlh-art-summary\">\n  <h2>Key Takeaways<\/h2>\n  <ul>\n    <li>NACE 1 (= SSPC SP 5, ISO Sa 3) \u2014 White metal blast, 100% contaminant removal.<\/li>\n    <li>NACE 2 (= SSPC SP 10, ISO Sa 2.5) \u2014 Near-white blast, \u226595% removal. Dominant in pipeline and offshore.<\/li>\n    <li>NACE 3 (= SSPC SP 6, ISO Sa 2) \u2014 Commercial blast, \u226566% removal.<\/li>\n    <li>NACE 4 (= SSPC SP 7, ISO Sa 1) \u2014 Brush-off blast, loose contaminants only.<\/li>\n    <li>NACE merged with SSPC into AMPP in 2021, but NACE designations remain in active use globally.<\/li>\n  <\/ul>\n<\/aside>\n\n<nav class=\"hlh-art-toc\" aria-label=\"Table des mati\u00e8res\">\n  <h2>Table of Contents<\/h2>\n  <ol>\n    <li><a href=\"#intro\">The NACE Standards in Context<\/a><\/li>\n    <li><a href=\"#nace1\">NACE No. 1 \u2014 White Metal Blast<\/a><\/li>\n    <li><a href=\"#nace2\">NACE No. 2 \u2014 Near-White Blast<\/a><\/li>\n    <li><a href=\"#nace3\">NACE No. 3 \u2014 Commercial Blast<\/a><\/li>\n    <li><a href=\"#nace4\">NACE No. 4 \u2014 Brush-off Blast<\/a><\/li>\n    <li><a href=\"#joint\">Joint SSPC\/NACE Documents<\/a><\/li>\n  <\/ol>\n<\/nav>\n\n<section id=\"intro\" class=\"hlh-art-section\">\n  <h2>The NACE Standards in Context<\/h2>\n  <p>NACE International (now part of AMPP \u2014 Association for Materials Protection and Performance) developed its own numbered system for blast cleaning grades that runs parallel to SSPC. The two were jointly published for many years as combined documents (e.g., SSPC-SP 10\/NACE No. 2).<\/p>\n\n<p>Pipeline contractors, offshore platform operators, and petrochemical engineering firms tend to cite NACE; structural steel fabricators, shipyards, and architectural projects tend to cite SSPC. Both are correct and describe the same cleanliness criteria. The full standards landscape is in our <a href=\"https:\/\/hlh-js.com\/resource\/blog\/sand-blasted-surface\/\" target=\"_blank\" rel=\"noopener\">pillar guide on sand blasted surface specification<\/a>.<\/p>\n<\/section>\n\n<section id=\"nace1\" class=\"hlh-art-section\">\n  <h2>NACE No. 1 \u2014 White Metal Blast<\/h2>\n  <p>Equivalent to SSPC SP 5 and ISO 8501-1 Sa 3. The visual criterion: <strong>all<\/strong> visible oil, grease, dirt, mill scale, rust, oxide, paint, and other foreign matter removed, presenting as uniformly bright metal.<\/p>\n\n<p>Typical NACE-specifying contexts where NACE No. 1 is cited:<\/p>\n<ul>\n  <li>Internal coating of large oil and gas storage tanks<\/li>\n  <li>Pipe internal coatings for crude transmission<\/li>\n  <li>FRP-lined vessels for chemical service<\/li>\n  <li>Critical immersion service in petrochemical facilities<\/li>\n<\/ul>\n\n<div class=\"hlh-art-callout\">\n  <div class=\"hlh-art-callout-title\">Cost Note<\/div>\n  <p>NACE 1 \/ SP 5 is the most expensive cleanliness grade. Pipeline contractors typically default to NACE 2 unless internal immersion coatings are involved.<\/p>\n<\/div>\n<\/section>\n\n<section id=\"nace2\" class=\"hlh-art-section\">\n  <h2>NACE No. 2 \u2014 Near-White Blast<\/h2>\n  <p>Equivalent to SSPC SP 10 and ISO 8501-1 Sa 2\u00bd. The dominant standard in pipeline, offshore, and petrochemical work. The visual criterion permits very light staining or shadowing on no more than 5% of each unit area.<\/p>\n\n<p>NACE 2 is the cleanliness standard underlying virtually all modern external pipeline coatings (fusion-bonded epoxy, three-layer polyethylene), offshore structural coatings, and petrochemical equipment. The complete external pipeline coating workflow rests on this cleanliness followed by appropriate profile depth \u2014 see our guide on <a href=\"https:\/\/hlh-js.com\/resource\/blog\/anchor-pattern-specifications-how-to-match-profile-depth-to-coating-dft\/\" target=\"_blank\" rel=\"noopener\">anchor pattern specifications: how to match profile depth to coating DFT<\/a>.<\/p>\n<\/section>\n\n<section id=\"nace3\" class=\"hlh-art-section\">\n  <h2>NACE No. 3 \u2014 Commercial Blast<\/h2>\n  <p>Equivalent to SSPC SP 6 and ISO 8501-1 Sa 2. At least 66% of each unit area free of all visible contaminants; tightly adherent material may remain on up to 33%.<\/p>\n\n<p>NACE 3 sees use in:<\/p>\n<ul>\n  <li>Atmospheric pipeline service (above-ground sections in mild environments)<\/li>\n  <li>Tank exteriors with thick high-build coatings<\/li>\n  <li>Structural members in petrochemical plants where corrosion exposure is moderate<\/li>\n  <li>Maintenance painting over previously coated steel<\/li>\n<\/ul>\n<\/section>\n\n<section id=\"nace4\" class=\"hlh-art-section\">\n  <h2>NACE No. 4 \u2014 Brush-off Blast<\/h2>\n  <p>Equivalent to SSPC SP 7 and ISO 8501-1 Sa 1. The lightest blast cleanliness grade \u2014 only loose mill scale, loose rust, and loose coatings must be removed.<\/p>\n\n<p>NACE 4 is used for:<\/p>\n<ul>\n  <li>Maintenance touch-up over existing pipeline coatings<\/li>\n  <li>Pre-cleaning before thick mastic or polyurea overlay<\/li>\n  <li>Field repair work where full re-blast is economically prohibitive<\/li>\n<\/ul>\n<\/section>\n\n<section id=\"joint\" class=\"hlh-art-section\">\n  <h2>Joint SSPC\/NACE Documents<\/h2>\n  <p>From the 1990s through 2021, SSPC and NACE published the four primary blast cleaning standards as joint documents:<\/p>\n\n<ul>\n  <li><strong>SSPC-SP 5\/NACE No. 1<\/strong> \u2014 White metal blast cleaning<\/li>\n  <li><strong>SSPC-SP 10\/NACE No. 2<\/strong> \u2014 Near-white metal blast cleaning<\/li>\n  <li><strong>SSPC-SP 6\/NACE No. 3<\/strong> \u2014 Commercial blast cleaning<\/li>\n  <li><strong>SSPC-SP 7\/NACE No. 4<\/strong> \u2014 Brush-off blast cleaning<\/li>\n<\/ul>\n\n<p>Following the 2021 merger of NACE and SSPC into AMPP, the joint structure continues. When you see only the NACE number, the SSPC equivalent is automatically implied. The complete SSPC standards family is mapped in our <a href=\"https:\/\/hlh-js.com\/resource\/blog\/sspc-sp5-sp6-sp10-vs-iso-sa-1-sa-2-sa-2-5-sa-3-complete-cross-reference\/\" target=\"_blank\" rel=\"noopener\">SSPC vs ISO Sa complete cross-reference<\/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\/sspc-sp5-sp6-sp10-vs-iso-sa-1-sa-2-sa-2-5-sa-3-complete-cross-reference\/\" target=\"_blank\" rel=\"noopener\">SSPC vs ISO Sa Complete Cross-Reference<\/a>\n    <\/div>\n    <div class=\"hlh-art-related-card\">\n      <a href=\"https:\/\/hlh-js.com\/resource\/blog\/sand-blasted-steel-for-marine-offshore-sa-2-5-zinc-primer-workflow\/\" target=\"_blank\" rel=\"noopener\">Sand Blasted Steel for Marine &#038; Offshore: SA 2.5 + Zinc Primer Workflow<\/a>\n    <\/div>\n    <div class=\"hlh-art-related-card\">\n      <a href=\"https:\/\/hlh-js.com\/resource\/blog\/anchor-pattern-specifications-how-to-match-profile-depth-to-coating-dft\/\" target=\"_blank\" rel=\"noopener\">Anchor Pattern Specifications<\/a>\n    <\/div>\n    <div class=\"hlh-art-related-card\">\n      <a href=\"https:\/\/hlh-js.com\/resource\/blog\/how-to-write-a-sand-blasted-surface-spec-for-suppliers-free-template\/\" target=\"_blank\" rel=\"noopener\">How to Write a Sand Blasted Surface Spec for Suppliers<\/a>\n    <\/div>\n  <\/div>\n<\/section>\n\n<section id=\"faq\" class=\"hlh-art-section hlh-art-faq\">\n  <h2>Questions fr\u00e9quemment pos\u00e9es<\/h2>\n  <details>\n    <summary>Is NACE 2 the same as SSPC SP 10?<\/summary>\n    <div class=\"hlh-art-faq-body\"><p>Yes. NACE No. 2 and SSPC SP 10 are equivalent designations for near-white metal blast cleaning. The two organizations published joint standards for many years, and the standards are now consolidated under AMPP.<\/p><\/div>\n  <\/details>\n  <details>\n    <summary>Which standards system do pipeline projects use?<\/summary>\n    <div class=\"hlh-art-faq-body\"><p>Pipeline, offshore, and petrochemical projects predominantly cite NACE designations. Structural steel fabricators and architectural projects more commonly cite SSPC. Both reference identical cleanliness criteria.<\/p><\/div>\n  <\/details>\n  <details>\n    <summary>What replaced NACE after the AMPP merger?<\/summary>\n    <div class=\"hlh-art-faq-body\"><p>NACE merged with SSPC in 2021 to form AMPP. The NACE designations remain in active use; new standards are published under AMPP with backward compatibility to both NACE and SSPC numbering.<\/p><\/div>\n  <\/details>\n  <details>\n    <summary>Is there a NACE standard for wet abrasive blasting?<\/summary>\n    <div class=\"hlh-art-faq-body\"><p>Yes. SSPC-SP 16\/NACE WAB-6 covers wet abrasive blasting to a near-white finish, and additional WAB-designated standards address wet abrasive variants at other cleanliness levels.<\/p><\/div>\n  <\/details>\n  <details>\n    <summary>What is NACE No. 5?<\/summary>\n    <div class=\"hlh-art-faq-body\"><p>There is no NACE No. 5 in the blast cleaning series. The numbered series for abrasive blast cleaning includes NACE 1, 2, 3, 4, and 8 (industrial blast).<\/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\": \"NACE 1\\\/2\\\/3\\\/4 Blast Cleaning Standards Explained with Visual References\",\n            \"description\": \"The four NACE blast cleaning grades \\u2014 used widely in pipeline, offshore, and petrochemical specifications \\u2014 explained with visual criteria, joint NACE\\\/SSPC mapping, and guidance on when NACE is cited rather than SSPC.\",\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\\\/nace-1-2-3-4-blast-cleaning-standards-explained-with-visual-references\\\/\"\n        },\n        {\n            \"@type\": \"FAQPage\",\n            \"mainEntity\": [\n                {\n                    \"@type\": \"Question\",\n                    \"name\": \"Is NACE 2 the same as SSPC SP 10?\",\n                    \"acceptedAnswer\": {\n                        \"@type\": \"Answer\",\n                        \"text\": \"Yes. 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Both reference identical cleanliness criteria.\"\n                    }\n                },\n                {\n                    \"@type\": \"Question\",\n                    \"name\": \"What replaced NACE after the AMPP merger?\",\n                    \"acceptedAnswer\": {\n                        \"@type\": \"Answer\",\n                        \"text\": \"NACE merged with SSPC in 2021 to form AMPP. The NACE designations remain in active use; new standards are published under AMPP with backward compatibility to both NACE and SSPC numbering.\"\n                    }\n                },\n                {\n                    \"@type\": \"Question\",\n                    \"name\": \"Is there a NACE standard for wet abrasive blasting?\",\n                    \"acceptedAnswer\": {\n                        \"@type\": \"Answer\",\n                        \"text\": \"Yes. SSPC-SP 16\\\/NACE WAB-6 covers wet abrasive blasting to a near-white finish, and additional WAB-designated standards address wet abrasive variants at other cleanliness levels.\"\n                    }\n                },\n                {\n                    \"@type\": \"Question\",\n                    \"name\": \"What is NACE No. 5?\",\n                    \"acceptedAnswer\": {\n                        \"@type\": \"Answer\",\n                        \"text\": \"There is no NACE No. 5 in the blast cleaning series. The numbered series for abrasive blast cleaning includes NACE 1, 2, 3, 4, and 8 (industrial blast).\"\n                    }\n                }\n            ]\n        }\n    ]\n}<\/script>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Standards Reference Published &middot; May 2026 NACE 1\/2\/3\/4 Blast Cleaning  [&#8230;]<\/p>","protected":false},"author":1,"featured_media":13230,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[62,175,138],"tags":[],"class_list":["post-13185","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-industry","category-resource"],"_links":{"self":[{"href":"https:\/\/hlh-js.com\/fr\/wp-json\/wp\/v2\/posts\/13185","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hlh-js.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hlh-js.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hlh-js.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/hlh-js.com\/fr\/wp-json\/wp\/v2\/comments?post=13185"}],"version-history":[{"count":2,"href":"https:\/\/hlh-js.com\/fr\/wp-json\/wp\/v2\/posts\/13185\/revisions"}],"predecessor-version":[{"id":13187,"href":"https:\/\/hlh-js.com\/fr\/wp-json\/wp\/v2\/posts\/13185\/revisions\/13187"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hlh-js.com\/fr\/wp-json\/wp\/v2\/media\/13230"}],"wp:attachment":[{"href":"https:\/\/hlh-js.com\/fr\/wp-json\/wp\/v2\/media?parent=13185"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hlh-js.com\/fr\/wp-json\/wp\/v2\/categories?post=13185"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hlh-js.com\/fr\/wp-json\/wp\/v2\/tags?post=13185"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}