{"id":13209,"date":"2026-05-28T01:50:23","date_gmt":"2026-05-28T01:50:23","guid":{"rendered":"https:\/\/hlh-js.com\/?p=13209"},"modified":"2026-05-28T01:50:23","modified_gmt":"2026-05-28T01:50:23","slug":"sand-blasted-steel-for-marine-offshore-sa-2-5-zinc-primer-workflow","status":"publish","type":"post","link":"https:\/\/hlh-js.com\/ru\/resource\/\u0431\u043b\u043e\u0433\/sand-blasted-steel-for-marine-offshore-sa-2-5-zinc-primer-workflow\/","title":{"rendered":"Sand Blasted Steel for Marine &amp; Offshore: SA 2.5 + Zinc Primer Workflow"},"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; font-weight: 700; line-height: 1.3;\n    margin: 0 0 0.6em; letter-spacing: -0.01em;\n  }\n  .hlh-art h1 { font-size: 2.2rem; }\n  .hlh-art h2 { font-size: 1.55rem; margin-top: 2.2rem; padding-top: 0.4rem; border-bottom: 2px solid #e2e5ea; padding-bottom: 10px; }\n  .hlh-art h3 { font-size: 1.2rem; margin-top: 1.6rem; }\n  .hlh-art h4 { font-size: 1.02rem; margin-top: 1.1rem; }\n  .hlh-art p { margin: 0 0 1.1em; }\n  .hlh-art a { color: #c75d12; text-decoration: none; border-bottom: 1px solid rgba(199,93,18,0.25); transition: all 0.2s ease; }\n  .hlh-art a:hover { color: #0f3057; border-bottom-color: #0f3057; }\n  .hlh-art ul, .hlh-art ol { padding-left: 1.4em; margin: 0 0 1.1em; }\n  .hlh-art li { margin-bottom: 0.45em; }\n  .hlh-art strong { color: #0f3057; font-weight: 700; }\n\n  .hlh-art-hero {\n    background: linear-gradient(135deg, #0f3057 0%, #082244 60%, #0a2a4f 100%);\n    color: #fff; padding: 42px 36px 38px; border-radius: 14px;\n    margin: 10px 0 30px; position: relative; overflow: hidden;\n  }\n  .hlh-art-hero::before {\n    content: \"\"; position: absolute; top: -50px; right: -50px;\n    width: 200px; height: 200px;\n    background: radial-gradient(circle, rgba(232,120,46,0.22), transparent 70%);\n    border-radius: 50%;\n  }\n  .hlh-art-hero h1 { color: #fff; margin-bottom: 14px; position: relative; }\n  .hlh-art-hero .hlh-art-lede { font-size: 1.05rem; color: #d6dee8; max-width: 760px; margin-bottom: 0; position: relative; }\n  .hlh-art-meta-row { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 20px; align-items: center; position: relative; }\n  .hlh-art-tag { background: #e8782e; color: #fff; padding: 5px 14px; border-radius: 30px;\n    font-size: 0.76rem; font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase; }\n  .hlh-art-date { color: #9eb2c9; font-size: 0.84rem; }\n\n  .hlh-art-summary {\n    background: #fff8f0; border-left: 4px solid #e8782e;\n    padding: 20px 26px; border-radius: 8px; margin: 0 0 28px;\n  }\n  .hlh-art-summary h2 {\n    margin-top: 0; font-size: 1.05rem; color: #c75d12;\n    text-transform: uppercase; letter-spacing: 0.05em;\n    border: none; padding: 0 0 8px;\n  }\n  .hlh-art-summary ul { margin-bottom: 0; }\n\n  .hlh-art-toc {\n    background: #f6f7f9; border: 1px solid #e2e5ea; border-radius: 10px;\n    padding: 22px 28px; margin: 0 0 36px;\n  }\n  .hlh-art-toc h2 {\n    font-size: 1rem; margin: 0 0 12px; padding-bottom: 8px;\n    border-bottom: 2px solid #0f3057;\n    text-transform: uppercase; letter-spacing: 0.05em;\n  }\n  .hlh-art-toc ol { columns: 2; column-gap: 32px; padding-left: 20px; margin: 0; }\n  .hlh-art-toc ol li { break-inside: avoid; margin-bottom: 0.35em; font-size: 0.93rem; }\n  .hlh-art-toc a { color: #0f3057; border: none; font-weight: 500; }\n  .hlh-art-toc a:hover { color: #c75d12; text-decoration: underline; }\n\n  .hlh-art-section { margin-bottom: 26px; scroll-margin-top: 80px; }\n\n  .hlh-art-callout {\n    background: #eef3f9; border-left: 4px solid #0f3057;\n    padding: 18px 22px; border-radius: 6px; margin: 20px 0;\n  }\n  .hlh-art-callout-title {\n    color: #0f3057; font-weight: 700; margin-bottom: 6px;\n    font-size: 0.76rem; text-transform: uppercase; letter-spacing: 0.06em;\n  }\n  .hlh-art-callout p:last-child { margin-bottom: 0; }\n  .hlh-art-callout-tip { background: #fff8f0; border-left-color: #e8782e; }\n  .hlh-art-callout-tip .hlh-art-callout-title { color: #c75d12; }\n\n  .hlh-art-table-wrap { overflow-x: auto; margin: 20px 0; border-radius: 8px; border: 1px solid #e2e5ea; }\n  .hlh-art table { width: 100%; border-collapse: collapse; font-size: 0.91rem; background: #fff; }\n  .hlh-art th { background: #0f3057; color: #fff; text-align: left; padding: 12px 14px; font-weight: 600; font-size: 0.86rem; }\n  .hlh-art td { padding: 11px 14px; border-bottom: 1px solid #ecedf0; vertical-align: top; }\n  .hlh-art tr:nth-child(even) td { background: #f8f9fb; }\n  .hlh-art tr:last-child td { border-bottom: none; }\n  .hlh-art td strong { color: #c75d12; }\n\n  .hlh-art-grid2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; margin: 20px 0; }\n  .hlh-art-card {\n    background: #f6f7f9; border-radius: 8px; padding: 18px 20px;\n    border-left: 3px solid #0f3057;\n  }\n  .hlh-art-card h4 { margin: 0 0 6px; color: #0f3057; font-size: 1rem; }\n  .hlh-art-card p { font-size: 0.9rem; color: #4b5663; margin-bottom: 0; }\n  .hlh-art-card.accent { border-left-color: #e8782e; }\n  .hlh-art-card.accent h4 { color: #c75d12; }\n\n  .hlh-art-grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin: 20px 0; }\n  .hlh-art-grid3 .hlh-art-card {\n    background: #fff; border: 1px solid #e2e5ea; border-radius: 10px;\n    padding: 18px; border-left: none; border-top: 4px solid #0f3057;\n  }\n  .hlh-art-grid3 .hlh-art-card.accent { border-top-color: #e8782e; }\n  .hlh-art-grid3 .hlh-art-card ul { font-size: 0.88rem; padding-left: 1.1em; margin: 6px 0 0; }\n\n  .hlh-art-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin: 22px 0; }\n  .hlh-art-step {\n    background: #fff; border: 1px solid #e2e5ea; border-radius: 10px;\n    padding: 20px 16px; transition: transform 0.2s, box-shadow 0.2s;\n  }\n  .hlh-art-step:hover { transform: translateY(-3px); box-shadow: 0 8px 22px rgba(15,48,87,0.1); }\n  .hlh-art-step-num {\n    display: inline-flex; align-items: center; justify-content: center;\n    width: 34px; height: 34px; border-radius: 50%;\n    background: #e8782e; color: #fff; font-weight: 700; font-size: 0.95rem;\n    margin-bottom: 10px;\n  }\n  .hlh-art-step-title { font-weight: 700; color: #0f3057; margin-bottom: 4px; font-size: 0.95rem; }\n  .hlh-art-step-desc { font-size: 0.84rem; color: #5b6573; line-height: 1.55; }\n\n  .hlh-art-faq details {\n    background: #fff; border: 1px solid #e2e5ea; border-radius: 8px;\n    margin-bottom: 12px; padding: 0; overflow: hidden; transition: all 0.2s;\n  }\n  .hlh-art-faq details[open] { border-color: #0f3057; box-shadow: 0 4px 14px rgba(15,48,87,0.06); }\n  .hlh-art-faq summary {\n    padding: 15px 22px; cursor: pointer; font-weight: 600; color: #0f3057;\n    font-size: 0.98rem; list-style: none; position: relative; padding-right: 48px;\n    user-select: none;\n  }\n  .hlh-art-faq summary::-webkit-details-marker { display: none; }\n  .hlh-art-faq summary::after {\n    content: \"+\"; position: absolute; right: 20px; top: 50%;\n    transform: translateY(-50%); font-size: 1.35rem; color: #e8782e;\n    font-weight: 400;\n  }\n  .hlh-art-faq details[open] summary::after { content: \"\u2212\"; }\n  .hlh-art-faq-body { padding: 0 22px 16px; color: #2c3645; font-size: 0.94rem; }\n  .hlh-art-faq-body p:last-child { margin-bottom: 0; }\n\n  .hlh-art-related {\n    background: #f6f7f9; border-radius: 10px; padding: 24px 28px; margin: 32px 0;\n  }\n  .hlh-art-related h3 {\n    margin-top: 0; font-size: 1.05rem; color: #0f3057;\n    text-transform: uppercase; letter-spacing: 0.05em;\n    padding-bottom: 10px; border-bottom: 2px solid #e8782e; display: inline-block;\n  }\n  .hlh-art-related-grid { display: grid; 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\">Marine &#038; Offshore<\/span>\n    <span class=\"hlh-art-date\">Published &middot; May 2026<\/span>\n  <\/div>\n  <h1>Sand Blasted Steel for Marine &#038; Offshore: SA 2.5 + Zinc Primer Workflow<\/h1>\n  <p class=\"hlh-art-lede\">Marine and offshore steel demands the most rigorous sand blasting and coating workflow in industry. This guide covers the SA 2.5 \/ SP 10 cleanliness standard, recommended profile depth, the 4-hour primer window, salt contamination testing, and the complete yard workflow used in commercial shipbuilding.<\/p>\n<\/section>\n\n<aside class=\"hlh-art-summary\">\n  <h2>Key Takeaways<\/h2>\n  <ul>\n    <li>Marine standard cleanliness is Sa 2.5 \/ SP 10 \/ NACE 2 \u2014 near-white blast at 95%+ removal.<\/li>\n    <li>Target profile depth: 50\u2013100 \u00b5m Rz to match zinc-rich primer and full coating system.<\/li>\n    <li>Maximum holding time before priming: 4 hours in humid environments; flash rust voids the blast.<\/li>\n    <li>Salt contamination testing (chloride) per ISO 8502-6 \/ SSPC-Guide 15 is mandatory under most yard contracts.<\/li>\n  <\/ul>\n<\/aside>\n\n<nav class=\"hlh-art-toc\" aria-label=\"\u041e\u0433\u043b\u0430\u0432\u043b\u0435\u043d\u0438\u0435\">\n  <h2>Table of Contents<\/h2>\n  <ol>\n    <li><a href=\"#intro\">Why Marine Coatings Are Different<\/a><\/li>\n    <li><a href=\"#cleanliness\">Sa 2.5 \/ SP 10 Cleanliness Standard<\/a><\/li>\n    <li><a href=\"#profile\">Target Profile Depth<\/a><\/li>\n    <li><a href=\"#media\">Media Selection<\/a><\/li>\n    <li><a href=\"#4hour-window\">The 4-Hour Holding Window<\/a><\/li>\n    <li><a href=\"#salt-testing\">Salt Contamination Testing<\/a><\/li>\n    <li><a href=\"#workflow\">Complete Yard Workflow<\/a><\/li>\n  <\/ol>\n<\/nav>\n\n<section id=\"intro\" class=\"hlh-art-section\">\n  <h2>Why Marine Coatings Are Different<\/h2>\n  <p>Marine and offshore steel sees the most aggressive corrosion environment in industry: cyclic immersion or splash, high chloride content, biofouling, mechanical impact, and decades of expected service life. The protective coating system must perform reliably for 15\u201325 years between drydockings \u2014 failure means structural compromise, loss of class certification, or environmental incident.<\/p>\n\n<p>The entire workflow rests on the substrate preparation. A perfect coating over a poorly prepared substrate fails within 2\u20135 years. For the broader specification context, 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=\"cleanliness\" class=\"hlh-art-section\">\n  <h2>Sa 2.5 \/ SP 10 Cleanliness Standard<\/h2>\n  <p>Virtually all modern marine coating systems specify Sa 2.5 (ISO 8501-1) \/ SSPC SP 10 \/ NACE 2 \u2014 near-white blast cleanliness with at least 95% of each unit area free of all visible contaminants.<\/p>\n\n<p>Why Sa 2.5 rather than Sa 3? The 1.5% improvement in coating life from going to Sa 3 (100% white metal) rarely justifies the 30\u201350% cost increase, and modern coatings (especially zinc-rich primers) tolerate the slight residual shadowing permitted by Sa 2.5. The full breakdown of cleanliness grades is 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 cross-reference<\/a>.<\/p>\n\n<div class=\"hlh-art-callout\">\n  <div class=\"hlh-art-callout-title\">Class Society Requirements<\/div>\n  <p>Classification societies (DNV, LR, ABS, BV, RINA) typically reference Sa 2.5 in their coating performance standards (e.g., PSPC for ballast tanks). Sa 2.5 is not negotiable for new-build commercial vessels.<\/p>\n<\/div>\n<\/section>\n\n<section id=\"profile\" class=\"hlh-art-section\">\n  <h2>Target Profile Depth<\/h2>\n  <p>Marine zinc-rich primer systems require an anchor pattern of 50\u2013100 \u00b5m Rz. This range matches the 75\u2013125 \u00b5m DFT of typical inorganic zinc primers, satisfying the 3:1 DFT-to-profile rule covered in our <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 guide<\/a>.<\/p>\n\n<div class=\"hlh-art-table-wrap\">\n<table>\n  <thead><tr><th>Coating System<\/th><th>Profile Target<\/th><\/tr><\/thead>\n  <tbody>\n    <tr><td>Inorganic zinc-rich primer alone<\/td><td>50&ndash;75 \u00b5m Rz<\/td><\/tr>\n    <tr><td>Zinc + epoxy + polyurethane (atmospheric)<\/td><td>60&ndash;90 \u00b5m Rz<\/td><\/tr>\n    <tr><td>Zinc + epoxy (immersion ballast)<\/td><td>75&ndash;100 \u00b5m Rz<\/td><\/tr>\n    <tr><td>Coal tar epoxy underwater<\/td><td>75&ndash;100 \u00b5m Rz<\/td><\/tr>\n    <tr><td>Thermal spray aluminum (TSA)<\/td><td>75&ndash;100 \u00b5m Rz<\/td><\/tr>\n  <\/tbody>\n<\/table>\n<\/div>\n<\/section>\n\n<section id=\"media\" class=\"hlh-art-section\">\n  <h2>Media Selection<\/h2>\n  <p>Three media dominate marine and shipyard work:<\/p>\n\n<ul>\n  <li><strong>Steel grit (G-25 to G-50)<\/strong> \u2014 closed-loop recycled in yard cabinets; lowest cost per square meter; 100+ cycle reuse. Standard for new-build shipyards with reclamation systems.<\/li>\n  <li><strong>Garnet (30\/60 mesh)<\/strong> \u2014 open blasting and field touch-up; 3\u20135 cycle reuse; lower dust than slag alternatives. Standard for offshore field work and dry-dock repair.<\/li>\n  <li><strong>Copper slag \/ iron silicate slag<\/strong> \u2014 single-use; lowest material cost; high dust output. Used in regions with cheap slag supply and limited reclamation infrastructure.<\/li>\n<\/ul>\n\n<p>Jiangsu Henglihong Technology Co., Ltd. supplies certified marine-grade garnet and steel grit with the conductivity (\u2264 50 \u00b5S\/cm) and chloride (\u2264 25 ppm) certifications required by major class society specifications.<\/p>\n<\/section>\n\n<section id=\"4hour-window\" class=\"hlh-art-section\">\n  <h2>The 4-Hour Holding Window<\/h2>\n  <p>The single most important operational constraint in marine blasting: <strong>bare steel must be primed within 4 hours of blasting in typical humid coastal conditions<\/strong>. Flash rust forms when atmospheric moisture condenses on the freshly blasted surface, and even very light flash rust (Grade C or D per ISO 8501-3) voids the blast and requires re-preparation.<\/p>\n\n<div class=\"hlh-art-table-wrap\">\n<table>\n  <thead><tr><th>Conditions<\/th><th>Safe Holding Time<\/th><\/tr><\/thead>\n  <tbody>\n    <tr><td>RH &gt; 85%, high temperature<\/td><td>30 minutes to 2 hours<\/td><\/tr>\n    <tr><td>RH 70&ndash;85%, moderate temperature<\/td><td>2&ndash;4 hours<\/td><\/tr>\n    <tr><td>RH 60&ndash;70%, dehumidified hall<\/td><td>4&ndash;8 hours<\/td><\/tr>\n    <tr><td>RH &lt; 50%, climate-controlled<\/td><td>8&ndash;24 hours<\/td><\/tr>\n  <\/tbody>\n<\/table>\n<\/div>\n\n<p>Modern yards address the window by integrating blast and prime operations in the same shift, often with dedicated dehumidification of the blast hall.<\/p>\n<\/section>\n\n<section id=\"salt-testing\" class=\"hlh-art-section\">\n  <h2>Salt Contamination Testing<\/h2>\n  <p>Even properly blasted steel can retain soluble chloride contamination from prior marine exposure. Embedded chlorides cause osmotic blistering and coating failure within months. ISO 8502-6 and SSPC-Guide 15 specify chloride test methods:<\/p>\n\n<ul>\n  <li><strong>Bresle test<\/strong> \u2014 sample patch extraction with deionized water; chloride measured by conductivity or strip test.<\/li>\n  <li><strong>Latex patch test<\/strong> \u2014 adhesive patch with controlled water; alternative to Bresle.<\/li>\n  <li><strong>Direct surface conductivity<\/strong> \u2014 emerging method using surface-contact probes.<\/li>\n<\/ul>\n\n<p>Class society limits typically allow \u2264 30\u201350 mg\/m\u00b2 soluble chloride. Above the limit, the surface must be water-washed and re-blasted or re-tested after evaporation.<\/p>\n<\/section>\n\n<section id=\"workflow\" class=\"hlh-art-section\">\n  <h2>Complete Yard Workflow<\/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-wash<\/div>\n    <div class=\"hlh-art-step-desc\">Fresh water wash to remove sea salt and surface contaminants.<\/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 to Sa 2.5<\/div>\n    <div class=\"hlh-art-step-desc\">Steel grit or garnet; target Rz 60\u201390 \u00b5m; verify with replica tape.<\/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\">Chloride Test<\/div>\n    <div class=\"hlh-art-step-desc\">Bresle patch; reject if &gt; 30 mg\/m\u00b2 soluble chloride.<\/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\">Prime within 4 hours<\/div>\n    <div class=\"hlh-art-step-desc\">Inorganic zinc-rich primer; full DFT before any overnight hold.<\/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\/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\/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\/nace-1-2-3-4-blast-cleaning-standards-explained-with-visual-references\/\" target=\"_blank\" rel=\"noopener\">NACE 1\/2\/3\/4 Blast Cleaning Standards Explained<\/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: Shadowing, Embedment, Flash Rust<\/a>\n    <\/div>\n  <\/div>\n<\/section>\n\n<section id=\"faq\" class=\"hlh-art-section hlh-art-faq\">\n  <h2>\u0427\u0430\u0441\u0442\u043e \u0437\u0430\u0434\u0430\u0432\u0430\u0435\u043c\u044b\u0435 \u0432\u043e\u043f\u0440\u043e\u0441\u044b<\/h2>\n  <details>\n    <summary>What blast cleanliness is required for marine steel?<\/summary>\n    <div class=\"hlh-art-faq-body\"><p>Sa 2.5 \/ SSPC SP 10 \/ NACE 2 (near-white blast) is the standard for new-build commercial vessels and offshore structures. Class societies (DNV, LR, ABS, BV) reference this standard in their performance requirements.<\/p><\/div>\n  <\/details>\n  <details>\n    <summary>What profile depth does a marine coating system need?<\/summary>\n    <div class=\"hlh-art-faq-body\"><p>60\u201390 \u00b5m Rz is standard for zinc + epoxy + polyurethane systems. Higher (75\u2013100 \u00b5m) for immersion service and thermal spray aluminum. The profile depth pairs with the coating DFT to satisfy the 3:1 rule.<\/p><\/div>\n  <\/details>\n  <details>\n    <summary>Why is there a 4-hour limit before priming?<\/summary>\n    <div class=\"hlh-art-faq-body\"><p>Atmospheric moisture forms flash rust on bare blasted steel within hours, particularly in coastal humidity. Flash rust voids the cleanliness grade and requires re-blasting. The 4-hour window represents typical conditions; dehumidified halls extend the window.<\/p><\/div>\n  <\/details>\n  <details>\n    <summary>What is a Bresle test?<\/summary>\n    <div class=\"hlh-art-faq-body\"><p>A standardized chloride contamination test (ISO 8502-6) where an adhesive patch contains a known volume of deionized water that extracts soluble chlorides from the steel surface. The extracted water is then measured for conductivity or chloride concentration.<\/p><\/div>\n  <\/details>\n  <details>\n    <summary>Can copper slag be used for marine blasting?<\/summary>\n    <div class=\"hlh-art-faq-body\"><p>Copper slag is widely used in regions with cheap slag supply and limited reclamation infrastructure. It is single-use, generates significant dust, and produces a slightly aggressive profile. Major class societies accept slag media if it meets conductivity and chloride limits.<\/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 Steel for Marine & Offshore: SA 2.5 + Zinc Primer Workflow\",\n            \"description\": \"Marine and offshore steel demands the most rigorous sand blasting and coating workflow in industry. This guide covers the SA 2.5 \\\/ SP 10 cleanliness standard, recommended profile depth, the 4-hour primer window, salt contamination testing, and the complete yard workflow used in commercial shipbuilding.\",\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-steel-for-marine-offshore-sa-2-5-zinc-primer-workflow\\\/\"\n        },\n        {\n            \"@type\": \"FAQPage\",\n            \"mainEntity\": [\n                {\n                    \"@type\": \"Question\",\n                    \"name\": \"What blast cleanliness is required for marine steel?\",\n                    \"acceptedAnswer\": {\n                        \"@type\": \"Answer\",\n                        \"text\": \"Sa 2.5 \\\/ SSPC SP 10 \\\/ NACE 2 (near-white blast) is the standard for new-build commercial vessels and offshore structures. Class societies (DNV, LR, ABS, BV) reference this standard in their performance requirements.\"\n                    }\n                },\n                {\n                    \"@type\": \"Question\",\n                    \"name\": \"What profile depth does a marine coating system need?\",\n                    \"acceptedAnswer\": {\n                        \"@type\": \"Answer\",\n                        \"text\": \"60\\u201390 \\u00b5m Rz is standard for zinc + epoxy + polyurethane systems. Higher (75\\u2013100 \\u00b5m) for immersion service and thermal spray aluminum. The profile depth pairs with the coating DFT to satisfy the 3:1 rule.\"\n                    }\n                },\n                {\n                    \"@type\": \"Question\",\n                    \"name\": \"Why is there a 4-hour limit before priming?\",\n                    \"acceptedAnswer\": {\n                        \"@type\": \"Answer\",\n                        \"text\": \"Atmospheric moisture forms flash rust on bare blasted steel within hours, particularly in coastal humidity. Flash rust voids the cleanliness grade and requires re-blasting. The 4-hour window represents typical conditions; dehumidified halls extend the window.\"\n                    }\n                },\n                {\n                    \"@type\": \"Question\",\n                    \"name\": \"What is a Bresle test?\",\n                    \"acceptedAnswer\": {\n                        \"@type\": \"Answer\",\n                        \"text\": \"A standardized chloride contamination test (ISO 8502-6) where an adhesive patch contains a known volume of deionized water that extracts soluble chlorides from the steel surface. The extracted water is then measured for conductivity or chloride concentration.\"\n                    }\n                },\n                {\n                    \"@type\": \"Question\",\n                    \"name\": \"Can copper slag be used for marine blasting?\",\n                    \"acceptedAnswer\": {\n                        \"@type\": \"Answer\",\n                        \"text\": \"Copper slag is widely used in regions with cheap slag supply and limited reclamation infrastructure. It is single-use, generates significant dust, and produces a slightly aggressive profile. Major class societies accept slag media if it meets conductivity and chloride limits.\"\n                    }\n                }\n            ]\n        }\n    ]\n}<\/script>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Marine &#038; Offshore Published &middot; May 2026 Sand Blasted Steel  [&#8230;]<\/p>","protected":false},"author":1,"featured_media":13238,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[62,175,138],"tags":[],"class_list":["post-13209","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-industry","category-resource"],"_links":{"self":[{"href":"https:\/\/hlh-js.com\/ru\/wp-json\/wp\/v2\/posts\/13209","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hlh-js.com\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hlh-js.com\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hlh-js.com\/ru\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/hlh-js.com\/ru\/wp-json\/wp\/v2\/comments?post=13209"}],"version-history":[{"count":2,"href":"https:\/\/hlh-js.com\/ru\/wp-json\/wp\/v2\/posts\/13209\/revisions"}],"predecessor-version":[{"id":13211,"href":"https:\/\/hlh-js.com\/ru\/wp-json\/wp\/v2\/posts\/13209\/revisions\/13211"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hlh-js.com\/ru\/wp-json\/wp\/v2\/media\/13238"}],"wp:attachment":[{"href":"https:\/\/hlh-js.com\/ru\/wp-json\/wp\/v2\/media?parent=13209"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hlh-js.com\/ru\/wp-json\/wp\/v2\/categories?post=13209"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hlh-js.com\/ru\/wp-json\/wp\/v2\/tags?post=13209"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}