{"id":13462,"date":"2026-06-24T06:36:16","date_gmt":"2026-06-24T06:36:16","guid":{"rendered":"https:\/\/hlh-js.com\/?p=13462"},"modified":"2026-06-24T06:36:16","modified_gmt":"2026-06-24T06:36:16","slug":"abrasive-media-for-industrial-surface-preparation","status":"publish","type":"post","link":"https:\/\/hlh-js.com\/ja\/resource\/blog\/abrasive-media-for-industrial-surface-preparation\/","title":{"rendered":"Abrasive Media for Industrial Surface Preparation"},"content":{"rendered":"<style>\n.hlh-p{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Oxygen,Ubuntu,sans-serif;color:#2d3748;line-height:1.78;max-width:900px;margin:0 auto;font-size:1rem}\n.hlh-p *{box-sizing:border-box}\n.hlh-p p{margin:0 0 1.3rem}\n.hlh-p h1{font-size:2.25rem;font-weight:800;color:#1a3456;margin:0 0 1.25rem;line-height:1.25}\n.hlh-p h2{font-size:1.65rem;font-weight:700;color:#1a3456;margin:2.75rem 0 1rem;padding-bottom:.55rem;border-bottom:3px solid #d86e18}\n.hlh-p h3{font-size:1.15rem;font-weight:600;color:#1a3456;margin:1.6rem 0 .5rem}\n.hlh-p ul,.hlh-p ol{margin:0 0 1.25rem;padding-left:1.5rem}\n.hlh-p li{margin:.35rem 0}\n.hlh-p strong{font-weight:600;color:#1a3456}\n.hlh-p a{color:#d86e18;text-decoration:none}\n.hlh-p a:hover{text-decoration:underline;color:#b55c14}\n.hlh-toc{background:#f7f9fc;border:1px solid #dde4ef;border-left:4px solid #d86e18;border-radius:8px;padding:1.4rem 1.75rem;margin:2rem 0}\n.hlh-toc-ttl{font-size:.76rem;text-transform:uppercase;letter-spacing:.09em;color:#7a8aa0;font-weight:700;margin:0 0 .75rem}\n.hlh-toc ol{margin:0;padding-left:1.2rem}\n.hlh-toc li{margin:.3rem 0;font-size:.9rem}\n.hlh-toc a{color:#1a3456;font-weight:500;text-decoration:none}\n.hlh-toc a:hover{color:#d86e18}\n.hlh-callout{background:#eef5ff;border-left:4px solid #3b82f6;border-radius:6px;padding:1rem 1.3rem;margin:1.5rem 0}\n.hlh-callout p{margin:0;font-size:.9rem;color:#1e3a5f;line-height:1.65}\n.hlh-twrap{overflow-x:auto;margin:1.5rem 0;border-radius:8px;border:1px solid #e5eaf2}\n.hlh-tbl{width:100%;border-collapse:collapse;font-size:.84rem;min-width:520px}\n.hlh-tbl thead th{background:#1a3456;color:#fff;padding:.75rem 1rem;text-align:left;font-weight:600;white-space:nowrap}\n.hlh-tbl tbody td{padding:.6rem 1rem;border-bottom:1px solid #eef1f7;color:#2d3748;vertical-align:top}\n.hlh-tbl tbody tr:last-child td{border-bottom:none}\n.hlh-tbl tbody tr:nth-child(even) td{background:#f8fafd}\n.hlh-tbl tbody tr:hover td{background:#edf4ff}\n.hlh-good{color:#15803d;font-weight:600}\n.hlh-fair{color:#b45309;font-weight:600}\n.hlh-flist{margin:1rem 0}\n.hlh-fitem{border:1px solid #e5eaf2;border-radius:8px;margin:.6rem 0;padding:1rem 1.25rem}\n.hlh-fq{font-weight:600;color:#1a3456;font-size:.93rem;margin:0 0 .5rem}\n.hlh-fa{font-size:.88rem;color:#5a6a80;margin:0;line-height:1.65}\n.hlh-cta{background:linear-gradient(130deg,#1a3456 0%,#2a508a 100%);border-radius:12px;padding:2.5rem 2rem;text-align:center;margin:3rem 0 1rem;color:#fff}\n.hlh-cta h2{color:#fff!important;border:none!important;margin:0 0 .75rem;font-size:1.45rem;padding:0!important}\n.hlh-cta p{color:rgba(255,255,255,.88);margin:0 0 1.5rem;font-size:1rem}\n.hlh-ctabtn{display:inline-block;background:#d86e18;color:#fff!important;padding:.8rem 2.25rem;border-radius:50px;font-weight:700;text-decoration:none!important;font-size:.95rem}\n.hlh-ctabtn:hover{background:#b55c14!important}\n@media(max-width:640px){.hlh-cta{padding:1.75rem 1.25rem}}\n<\/style>\n\n<div class=\"hlh-p\">\n<h1>Abrasive Media for Industrial Surface Preparation<\/h1>\n\n<p>Industrial surface preparation is the foundation of every successful corrosion protection system. It is not the most visible part of a protective coating project \u2014 that distinction belongs to the topcoat \u2014 but it is the most consequential. Industry-wide studies consistently show that more than 80% of premature coating failures are attributable to inadequate surface preparation: insufficient cleanliness level, wrong anchor profile depth, or inappropriate abrasive media selection for the substrate and coating system being applied. Choosing the right abrasive media supplies for industrial surface preparation is therefore one of the highest-value engineering decisions in any corrosion protection project.<\/p>\n\n<p>This guide addresses industrial surface preparation across the key heavy-industry sectors \u2014 structural steel fabrication, pipeline construction, storage tanks, marine and offshore, and infrastructure maintenance \u2014 providing the media selection framework, surface profile requirements, and applicable standards for each. For an overview of all available media types, see the <a href=\"https:\/\/hlh-js.com\/resource\/blog\/abrasive-media-supplies\/\" target=\"_blank\" rel=\"noopener\">Abrasive Media Supplies Buyer&#8217;s Guide<\/a>.<\/p>\n\n<div class=\"hlh-toc\">\n  <div class=\"hlh-toc-ttl\">Table of Contents<\/div>\n  <ol>\n    <li><a href=\"#ind-standards\">Surface Cleanliness Standards: ISO 8501-1 and SSPC\/NACE<\/a><\/li>\n    <li><a href=\"#ind-profile\">Anchor Profile Requirements by Coating System<\/a><\/li>\n    <li><a href=\"#ind-structural\">Structural Steel Fabrication<\/a><\/li>\n    <li><a href=\"#ind-pipeline\">Pipeline and Storage Tank Preparation<\/a><\/li>\n    <li><a href=\"#ind-marine\">Marine and Offshore Structures<\/a><\/li>\n    <li><a href=\"#ind-matrix\">Media Selection Matrix<\/a><\/li>\n    <li><a href=\"#ind-faq\">\u3088\u304f\u3042\u308b\u8cea\u554f<\/a><\/li>\n  <\/ol>\n<\/div>\n\n<h2 id=\"ind-standards\">Surface Cleanliness Standards: ISO 8501-1 and SSPC\/NACE<\/h2>\n<p>Two parallel systems of surface cleanliness standards govern industrial surface preparation globally. <strong>ISO 8501-1<\/strong> (adopted internationally) and the <strong>SSPC\/NACE<\/strong> joint standards (dominant in North American and offshore oil and gas specifications) define the same cleanliness levels by visual reference but use different terminology:<\/p>\n\n<div class=\"hlh-twrap\">\n  <table class=\"hlh-tbl\">\n    <thead>\n      <tr><th>ISO 8501-1 Grade<\/th><th>SSPC\/NACE Equivalent<\/th><th>\u8aac\u660e<\/th><th>When Required<\/th><\/tr>\n    <\/thead>\n    <tbody>\n      <tr><td>Sa 1<\/td><td>SSPC-SP 7 \/ NACE 4 (Brush-off)<\/td><td>Loose mill scale, rust, and coatings removed; surface may still show staining<\/td><td>Low-performance coatings, non-critical service<\/td><\/tr>\n      <tr><td>Sa 2<\/td><td>SSPC-SP 6 \/ NACE 3 (Commercial)<\/td><td>Most mill scale, rust, and coating removed; slight shadows and staining allowed<\/td><td>Moderate-duty coatings, inland structures<\/td><\/tr>\n      <tr><td>Sa 2.5<\/td><td>SSPC-SP 10 \/ NACE 2 (Near-white)<\/td><td>Only light staining on no more than 5% of surface; no visible mill scale, rust, or coating<\/td><td>Majority of industrial protective coatings<\/td><\/tr>\n      <tr><td>Sa 3<\/td><td>SSPC-SP 5 \/ NACE 1 (White metal)<\/td><td>Zero visible contamination; uniform grey-white metallic appearance<\/td><td>Immersion service, offshore, high-performance systems<\/td><\/tr>\n    <\/tbody>\n  <\/table>\n<\/div>\n\n<p>Sa 2.5 \/ SSPC-SP 10 is the most commonly specified cleanliness level for industrial surface preparation and represents the threshold at which most industrial coating systems achieve their designed service life. Sa 3 \/ SSPC-SP 5 is reserved for the most demanding service environments \u2014 offshore structures, chemical immersion tanks, and underground pipeline exteriors \u2014 where coating failure would be expensive or dangerous to address.<\/p>\n\n<h2 id=\"ind-profile\">Anchor Profile Requirements by Coating System<\/h2>\n<p>Alongside cleanliness grade, the anchor profile depth \u2014 the peak-to-valley height of the blasted surface texture \u2014 is the second critical parameter determined by the coating system specification. Too shallow an anchor and the coating cannot develop sufficient mechanical adhesion; too deep and coating peaks can perforate through thin-film coatings, creating rust initiation sites and reducing effective film build. Every coating manufacturer&#8217;s application data sheet specifies a minimum and maximum profile range for each product:<\/p>\n\n<div class=\"hlh-twrap\">\n  <table class=\"hlh-tbl\">\n    <thead>\n      <tr><th>Coating System<\/th><th>Typical Profile Requirement<\/th><th>Recommended Abrasive<\/th><\/tr>\n    <\/thead>\n    <tbody>\n      <tr><td>Inorganic zinc-rich primer<\/td><td>40\u201375 \u00b5m Rz<\/td><td>Garnet #30\/60 or Steel Grit GL 40<\/td><\/tr>\n      <tr><td>Epoxy primer + topcoat (atmospheric)<\/td><td>40\u201380 \u00b5m Rz<\/td><td>Garnet #30\/60, Steel Grit GL 25\u201340<\/td><\/tr>\n      <tr><td>Heavy-duty immersion epoxy<\/td><td>60\u2013100 \u00b5m Rz<\/td><td>Steel Grit GL 16\u2013GL 25<\/td><\/tr>\n      <tr><td>Coal tar epoxy (immersion\/buried)<\/td><td>75\u2013125 \u00b5m Rz<\/td><td>Steel Grit GL 16 or Copper Slag coarse<\/td><\/tr>\n      <tr><td>Thermal spray zinc\/aluminum<\/td><td>50\u2013100 \u00b5m Rz (roughness Ra)<\/td><td>White Aluminum Oxide F 24\u2013F 46<\/td><\/tr>\n      <tr><td>Fluoropolymer \/ PVDF topcoat<\/td><td>25\u201350 \u00b5m Rz<\/td><td>Garnet #80 or Steel Grit GL 40\u2013GL 80<\/td><\/tr>\n      <tr><td>FBE (fusion-bonded epoxy, pipeline)<\/td><td>40\u201375 \u00b5m Rz<\/td><td>Garnet #30\/60 or Steel Grit GL 40<\/td><\/tr>\n    <\/tbody>\n  <\/table>\n<\/div>\n\n<h2 id=\"ind-structural\">Structural Steel Fabrication<\/h2>\n<p>Steel fabrication shops preparing structural sections \u2014 I-beams, channels, plates, hollow sections \u2014 for priming before delivery to construction sites typically operate continuous-feed wheel blast machines. For this application, steel shot in S-330 to S-550 range delivers the fastest throughput on scale-free new steel, while a shot-grit blend (70:30 or 60:40 shot to grit) achieves the Sa 2.5 cleanliness with Rz 50\u201380 \u00b5m profile required for most structural primer systems. High-production fabrication shops almost universally use steel shot or a shot-grit blend in wheel blast \u2014 the 2,000\u20133,000 cycle reuse life of metallic media makes the economics decisively better than any mineral abrasive at production volumes of thousands of square meters per week.<\/p>\n\n<p>For structural components arriving at site with mill scale intact or with significant corrosion after outdoor storage, steel grit GL 25\u2013GL 40 in a pressure blast system achieves Sa 2.5\u2013Sa 3 reliably in a single pass, removing scale and rust that steel shot in a wheel blast machine cannot always clear in one pass. See our metallic media guide: <a href=\"https:\/\/hlh-js.com\/resource\/blog\/steel-grit-vs-steel-shot-choosing-the-right-metallic-blast-media\/\" target=\"_blank\" rel=\"noopener\">Steel Grit vs Steel Shot: Choosing the Right Metallic Blast Media<\/a>.<\/p>\n\n<h2 id=\"ind-pipeline\">Pipeline and Storage Tank Preparation<\/h2>\n<p>Pipeline external coating \u2014 typically fusion-bonded epoxy (FBE), 3-layer polyethylene (3LPE), or liquid epoxy \u2014 requires Sa 2.5 or Sa 3 cleanliness with an anchor profile of 40\u201375 \u00b5m Rz. The dominant media in pipeline construction blasting is garnet #30\/60, which achieves these profile requirements consistently in pressure blast operations, generates low dust that minimizes contamination of the freshly blasted surface before coating application (critical for FBE application, which must occur within minutes of blasting on pre-heated pipe), and complies with the low free-silica requirements of most pipeline project specifications.<\/p>\n\n<p>For internal blasting of large-diameter storage tanks (petroleum storage, water treatment, chemical containment), where coating systems commonly specify Sa 3 white metal with Rz 75\u2013100 \u00b5m for heavy-duty epoxy or coal tar epoxy linings, steel grit GL 16\u2013GL 25 in pressure blast systems is the standard specification. The aggressive cutting action of coarse steel grit in single-pass operation maximizes production speed in the confined space of a tank interior, where operator exposure time and ventilation requirements create economic pressure to minimize the number of blast passes. For more on surface preparation for coating: <a href=\"https:\/\/hlh-js.com\/resource\/blog\/best-abrasive-media-for-surface-prep-before-painting-coating\/\" target=\"_blank\" rel=\"noopener\">Best Abrasive Media for Surface Prep Before Painting &amp; Coating<\/a>.<\/p>\n\n<h2 id=\"ind-marine\">Marine and Offshore Structures<\/h2>\n<p>Marine and offshore surface preparation operates under some of the most demanding abrasive media selection constraints in any industry sector. The service environment (salt water immersion, splash zone, tidal zone, continuous high humidity) means that coating performance requirements are uncompromising: Sa 2.5 minimum with profiles typically 50\u2013100 \u00b5m, and strict limits on surface contamination before coating application (soluble salt limits of 20\u201350 mg\/m\u00b2 NaCl equivalent per Bresle patch test are standard in offshore specifications).<\/p>\n\n<p>Garnet #30\/60 is the benchmark abrasive for most marine and offshore blasting specifications, valued for its consistent profile, low dust (improving conditions for blast operators working in confined shipyard areas), low soluble salt contamination on the blasted surface, and low free silica content. For the most demanding offshore and immersion applications requiring Sa 3 with profiles above 75 \u00b5m, copper slag coarse grade provides the aggressive cutting action at lower media cost \u2014 though its higher dust generation requires more rigorous dust management and ventilation in enclosed hull sections.<\/p>\n\n<h2 id=\"ind-matrix\">Media Selection Matrix<\/h2>\n\n<div class=\"hlh-twrap\">\n  <table class=\"hlh-tbl\">\n    <thead>\n      <tr><th>\u7533\u3057\u8fbc\u307f<\/th><th>Required Grade<\/th><th>Recommended Media<\/th><th>Equipment Type<\/th><\/tr>\n    <\/thead>\n    <tbody>\n      <tr><td>New structural steel fabrication (shop)<\/td><td>Sa 2\u2013Sa 2.5<\/td><td>Steel Shot \/ Shot-Grit blend<\/td><td>Wheel blast (continuous)<\/td><\/tr>\n      <tr><td>Corroded structural steel (site)<\/td><td>Sa 2.5\u2013Sa 3<\/td><td>Steel Grit GL 25\u2013GL 40 or Garnet #30\/60<\/td><td>Pressure blast<\/td><\/tr>\n      <tr><td>Pipeline exterior (FBE \/ 3LPE)<\/td><td>Sa 2.5\u2013Sa 3<\/td><td>Garnet #30\/60<\/td><td>Pressure blast<\/td><\/tr>\n      <tr><td>Storage tank interior lining<\/td><td>Sa 3<\/td><td>Steel Grit GL 16\u2013GL 25<\/td><td>Pressure blast<\/td><\/tr>\n      <tr><td>Ship hull blasting<\/td><td>Sa 2.5<\/td><td>Garnet #30\/60 or Copper Slag coarse<\/td><td>Pressure blast<\/td><\/tr>\n      <tr><td>Offshore structural components<\/td><td>Sa 2.5\u2013Sa 3<\/td><td>Garnet #30\/60<\/td><td>Pressure blast<\/td><\/tr>\n      <tr><td>Bridge \/ infrastructure maintenance<\/td><td>Sa 2\u2013Sa 2.5<\/td><td>Garnet #30\/60 or Copper Slag<\/td><td>Pressure blast (contained)<\/td><\/tr>\n      <tr><td>Thermal spray substrate prep<\/td><td>Sa 3<\/td><td>White Aluminum Oxide F 24\u2013F 46<\/td><td>Pressure blast<\/td><\/tr>\n    <\/tbody>\n  <\/table>\n<\/div>\n\n<h2 id=\"ind-faq\">\u3088\u304f\u3042\u308b\u8cea\u554f<\/h2>\n<div class=\"hlh-flist\">\n\n  <div class=\"hlh-fitem\">\n    <div class=\"hlh-fq\">How long after blasting must coating be applied?<\/div>\n    <p class=\"hlh-fa\">The maximum allowable time between blasting and coating application \u2014 the &#8220;flash time&#8221; \u2014 is specified in the coating manufacturer&#8217;s application data sheet and typically ranges from 2 to 8 hours in dry atmospheric conditions at ambient temperature. In humid conditions (relative humidity above 85%), contamination, or environments where chloride deposition is possible, the window may be shorter. In dry desert or low-humidity environments, bare blasted steel can remain acceptable for slightly longer. The critical principle is that a flash rust formation on the blasted surface before coating application is applied is unacceptable \u2014 it must be re-blasted. Every hour between blasting completion and coating application that is not required for operational reasons represents unnecessary risk to coating performance.<\/p>\n  <\/div>\n\n  <div class=\"hlh-fitem\">\n    <div class=\"hlh-fq\">Does surface profile depth affect coating consumption?<\/div>\n    <p class=\"hlh-fa\">Yes, directly and significantly. The theoretical dry film thickness of a coating applied over a rough blasted surface is measured from the peak of the profile to the film surface \u2014 but the actual volume of coating consumed fills the valleys of the profile as well. A surface with Rz 75 \u00b5m profile requires noticeably more coating to achieve the specified minimum dry film thickness at the profile peaks than a surface with Rz 40 \u00b5m profile. Coating manufacturers typically specify their film thickness requirements based on a mid-range profile assumption and provide correction factors for profiles at the extremes of their allowed range. Exceeding the maximum specified profile not only increases coating consumption but risks peak perforation in thinner-film coatings.<\/p>\n  <\/div>\n\n  <div class=\"hlh-fitem\">\n    <div class=\"hlh-fq\">Can the same media be used for both shop and field blasting operations?<\/div>\n    <p class=\"hlh-fa\">The same media type can be used in both settings, but the practical equipment constraints usually lead to different choices. Shop (fabrication yard) operations typically use continuous-feed wheel blast machines optimized for metallic media (steel shot and grit), while field blasting uses portable pressure blast pots that handle a wider range of abrasives including garnet, copper slag, and aluminum oxide. Garnet is the most commonly specified single media that performs acceptably in both shop and field pressure blast systems, while steel shot and grit optimized for wheel blast machines are rarely used in field pressure blasting due to the equipment wear implications of running metallic media through portable blast nozzles and hoses at high rates.<\/p>\n  <\/div>\n\n<\/div>\n\n<div class=\"hlh-cta\">\n  <h2>Industrial Surface Preparation Media from Henglihong<\/h2>\n  <p>Garnet, steel shot, steel grit, aluminum oxide, and copper slag \u2014 all available in bulk for export. Factory-direct pricing with ISO-certified quality and SGS documentation.<\/p>\n  <a href=\"https:\/\/hlh-js.com\/contact\/\" class=\"hlh-ctabtn\" target=\"_blank\" rel=\"noopener\">Request a Quotation<\/a>\n<\/div>\n\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Abrasive Media for Industrial Surface Preparation Industrial surface preparation is  [&#8230;]<\/p>","protected":false},"author":1,"featured_media":13464,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[62,177,138],"tags":[],"class_list":["post-13462","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-material","category-resource"],"_links":{"self":[{"href":"https:\/\/hlh-js.com\/ja\/wp-json\/wp\/v2\/posts\/13462","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hlh-js.com\/ja\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hlh-js.com\/ja\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hlh-js.com\/ja\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/hlh-js.com\/ja\/wp-json\/wp\/v2\/comments?post=13462"}],"version-history":[{"count":2,"href":"https:\/\/hlh-js.com\/ja\/wp-json\/wp\/v2\/posts\/13462\/revisions"}],"predecessor-version":[{"id":13465,"href":"https:\/\/hlh-js.com\/ja\/wp-json\/wp\/v2\/posts\/13462\/revisions\/13465"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hlh-js.com\/ja\/wp-json\/wp\/v2\/media\/13464"}],"wp:attachment":[{"href":"https:\/\/hlh-js.com\/ja\/wp-json\/wp\/v2\/media?parent=13462"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hlh-js.com\/ja\/wp-json\/wp\/v2\/categories?post=13462"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hlh-js.com\/ja\/wp-json\/wp\/v2\/tags?post=13462"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}