{"id":12960,"date":"2026-04-28T02:21:19","date_gmt":"2026-04-28T02:21:19","guid":{"rendered":"https:\/\/hlh-js.com\/?p=12960"},"modified":"2026-04-28T05:15:20","modified_gmt":"2026-04-28T05:15:20","slug":"abrasives-for-sandblasting-marine-and-shipbuilding","status":"publish","type":"post","link":"https:\/\/hlh-js.com\/de\/resource\/blog\/abrasives-for-sandblasting-marine-and-shipbuilding\/","title":{"rendered":"Abrasives for Sandblasting\u00a0Marine &amp; Shipbuilding"},"content":{"rendered":"<p><style>\r\n\/* ============================================================\r\n   SHARED CLUSTER STYLE \u2014 Sandblasting Abrasives Series\r\n   Jiangsu Henglihong Technology Co., Ltd.\r\n   CSS prefix: hlh-cl-\r\n   ============================================================ *\/\r\n.hlh-cl-wrap*{box-sizing:border-box;margin:0;padding:0}\r\n.hlh-cl-wrap{font-family:'Georgia','Times New Roman',serif;color:#1a1a2e;line-height:1.75;font-size:16px;max-width:900px;margin:0 auto}\r\n.hlh-cl-wrap 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class=\"hlh-cl-wrap\"><a class=\"hlh-cl-pillar-back\" href=\"https:\/\/hlh-js.com\/resource\/blog\/sandblasting-abrasives-types-grit-sizes-selection-guide\/\" target=\"_blank\" rel=\"noopener\"><span class=\"hlh-cl-pillar-back-icon\">\u2190<\/span><\/a>\r\n<div><strong>Sandblasting Abrasives: Complete Buyer&#8217;s Guide<\/strong>Back to Pillar Page<\/div>\r\n<div class=\"hlh-cl-hero\">\r\n<div class=\"hlh-cl-eyebrow\">Series C \u2014 Industry Application<\/div>\r\n<h1>Abrasives for Sandblasting Marine &amp; Shipbuilding<\/h1>\r\n<p class=\"hlh-cl-hero-sub\">Ship hull preparation to Sa 2.5 and Sa 3 demands abrasives that deliver consistent surface profiles, meet chloride contamination limits, and comply with increasingly stringent drydock health and environmental regulations. Complete media guide for shipbuilding and marine maintenance blasting.<\/p>\r\n<div class=\"hlh-cl-hero-meta\">Sa 2.5 \/ Sa 3 StandardsChloride ControlHull &amp; TopsidesBallast Tank Prep<\/div>\r\n<div class=\"hlh-cl-cta-group\"><a class=\"hlh-cl-btn-primary\" href=\"https:\/\/hlh-js.com\/contact\/\" target=\"_blank\" rel=\"noopener\">Request a Quote<\/a><a class=\"hlh-cl-btn-outline\" href=\"#hlh-cl-media\">Media Guide \u2193<\/a><\/div>\r\n<\/div>\r\n<nav class=\"hlh-cl-toc\">\r\n<div class=\"hlh-cl-toc-title\">Table of Contents<\/div>\r\n<ol>\r\n<li><a href=\"#hlh-cl-standards\">Marine Blasting Standards<\/a><\/li>\r\n<li><a href=\"#hlh-cl-media\">Abrasive Media Selection<\/a><\/li>\r\n<li><a href=\"#hlh-cl-hull\">Hull Blasting<\/a><\/li>\r\n<li><a href=\"#hlh-cl-ballast\">Ballast Tank Preparation<\/a><\/li>\r\n<li><a href=\"#hlh-cl-chloride\">Chloride Contamination Control<\/a><\/li>\r\n<li><a href=\"#hlh-cl-env\">Environmental Compliance in Drydock<\/a><\/li>\r\n<li><a href=\"#hlh-cl-related\">Related Resources<\/a><\/li>\r\n<li><a href=\"#hlh-cl-faq\">FAQ<\/a><\/li>\r\n<\/ol>\r\n<\/nav>\r\n<section id=\"hlh-cl-standards\">\r\n<h2 class=\"hlh-cl-h2\">Marine Blasting Standards<\/h2>\r\n<p class=\"hlh-cl-lead\">Ship hull surface preparation is governed by ISO 8501-1 (visual cleanliness standard) and ISO 8503 (surface roughness profile). The dominant specification in shipbuilding and drydock maintenance is Sa 2.5 (Near-White Blast Cleaning) \u2014 defined as the complete removal of all oil, grease, mill scale, rust, and foreign matter, with only light discolouration permitted at pits and irregularities. Sa 3 (White Metal) is specified for critical immersed zones, ballast tanks, and void spaces in newbuild construction and major dry-docking cycles.<\/p>\r\n<p>Anchor profile requirements for marine coating systems vary by coating type: antifouling tie coat systems typically specify 50\u201375 \u00b5m (2.0\u20133.0 mil); high-build epoxy anticorrosion systems for immersed hull bottom require 50\u2013100 \u00b5m (2.0\u20134.0 mil); ballast tank epoxy systems typically specify 50\u2013125 \u00b5m (2.0\u20135.0 mil). Always refer to the coating manufacturer&#8217;s technical data sheet for the specific profile range required for the system being applied.<\/p>\r\n<\/section>\r\n<section id=\"hlh-cl-media\">\r\n<h2 class=\"hlh-cl-h2\">Abrasive Media Selection for Marine Applications<\/h2>\r\n<div class=\"hlh-cl-table-wrap\">\r\n<table class=\"hlh-cl-table\">\r\n<thead>\r\n<tr>\r\n<th>Anmeldung<\/th>\r\n<th>Recommended Media<\/th>\r\n<th>Grade \/ Size<\/th>\r\n<th>Profile Target<\/th>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td>Hull bottom (drydock)<\/td>\r\n<td>Garnet or steel grit<\/td>\r\n<td>GMA 16\u201320 \/ G25 GH<\/td>\r\n<td>2.0\u20133.0 mil<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Ballast tanks (newbuild)<\/td>\r\n<td>Stahlkorn<\/td>\r\n<td>G18\u2013G25 GH<\/td>\r\n<td>3.0\u20134.5 mil<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Ballast tanks (maintenance)<\/td>\r\n<td>Garnet or aluminum oxide<\/td>\r\n<td>GMA 16\u201320 \/ 36\u201346 grit<\/td>\r\n<td>2.0\u20133.5 mil<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Topsides &amp; superstructure<\/td>\r\n<td>Garnet or aluminum oxide<\/td>\r\n<td>GMA 20\u201330 \/ 46\u201360 grit<\/td>\r\n<td>1.5\u20132.5 mil<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Weather decks<\/td>\r\n<td>Garnet or aluminum oxide<\/td>\r\n<td>GMA 16\u201320 \/ 36 grit<\/td>\r\n<td>2.0\u20133.0 mil<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Void spaces<\/td>\r\n<td>Garnet or steel grit<\/td>\r\n<td>GMA 16\u201320 \/ G25 GH<\/td>\r\n<td>2.5\u20134.0 mil<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/div>\r\n<\/section>\r\n<section id=\"hlh-cl-hull\">\r\n<h2 class=\"hlh-cl-h2\">Hull Blasting: Key Considerations<\/h2>\r\n<p>Ship hull blasting in drydock is one of the most logistically demanding surface preparation tasks in any industry. The combination of large surface areas (up to 20,000+ m\u00b2 for a VLCC), tight docking schedules, enclosed drydock environments with dust accumulation concerns, and stringent coating specifications places the abrasive selection at the centre of both technical and commercial planning.<\/p>\r\n<p>Garnet (GMA 16\u201320 mesh) is widely specified for enclosed drydock hull blasting due to its low dust generation profile \u2014 the enclosed dock environment amplifies the health and visibility impact of dust compared to open-air blasting. Garnet&#8217;s low chloride content (typically &lt;25 ppm) also ensures that the blasting process itself does not introduce soluble salts onto the freshly cleaned surface \u2014 a critical consideration given that marine coating systems are highly sensitive to chloride contamination. For the comparison between garnet and other field blasting media, see the <a href=\"https:\/\/hlh-js.com\/resource\/blog\/garnet-vs-aluminum-oxide-blasting-abrasive\/\" target=\"_blank\" rel=\"noopener\">Garnet vs Aluminum Oxide guide<\/a>.<\/p>\r\n<p>Steel grit (G25 GH) in automated wheel-blast units is the standard for newbuild steel plate pre-treatment in shipyard blast shops, where production volume justifies the capital investment in wheel-blast lines and the enclosed facility enables full media recovery and recycling.<\/p>\r\n<\/section>\r\n<section id=\"hlh-cl-ballast\">\r\n<h2 class=\"hlh-cl-h2\">Ballast Tank Preparation<\/h2>\r\n<p>Ballast tank coating failure is the leading cause of unscheduled drydocking for the global merchant fleet. The aggressive cyclic immersion in seawater \u2014 alternating full immersion, partial filling, and empty humid conditions \u2014 subjects ballast tank coatings to some of the most demanding conditions in any industrial coating application. IMO Resolution MSC.215(82) requires ballast tanks on new ships to be coated in accordance with the Performance Standard for Protective Coatings (PSPC), which mandates Sa 2.5 cleanliness and a minimum anchor profile of 30 \u00b5m (approximately 1.2 mil), with a target profile of 30\u201375 \u00b5m (1.2\u20133.0 mil) for PSPC compliant systems.<\/p>\r\n<p>For ballast tanks on newbuild vessels where PSPC compliance is mandatory, steel grit G18\u2013G25 GH in automated or semi-automated blast equipment is the standard specification \u2014 producing the consistent Sa 2.5 or Sa 3 cleanliness and 2.5\u20134.0 mil profiles required. Abrasive cleanliness (SSPC AB-1 equivalent) is a mandatory quality check \u2014 contaminated recycled media can introduce soluble salts or oil from prior blasting batches, compromising the freshly blasted surface before coating application.<\/p>\r\n<\/section>\r\n<section id=\"hlh-cl-chloride\">\r\n<h2 class=\"hlh-cl-h2\">Chloride Contamination Control<\/h2>\r\n<p>Chloride contamination on blast-cleaned steel surfaces is one of the most common causes of premature marine coating failure. Chloride ions beneath the coating film cause osmotic blistering, underfilm corrosion, and adhesion loss \u2014 all of which are invisible during initial inspection and manifest as coating failure weeks to months after application. NACE SP0508 and IMO PSPC specify maximum soluble salt limits on the blast-cleaned surface before coating application, typically expressed as chloride equivalent \u2264 50 mg\/m\u00b2 (equivalent to \u2264 50 \u00b5g\/cm\u00b2) for demanding marine service.<\/p>\r\n<p>The blasting abrasive itself can be a source of chloride contamination if media quality is not controlled. GMA garnet is routinely tested for chloride content (&lt;25 ppm is the standard specification for marine use) because it is used in environments where chloride introduction from the media would directly compromise coating performance. Recycled metallic media (steel grit, steel shot) must be periodically tested for soluble salt accumulation \u2014 salt contamination from previous blasting cycles can be reintroduced to fresh surfaces if media quality control is not maintained.<\/p>\r\n<\/section>\r\n<section id=\"hlh-cl-env\">\r\n<h2 class=\"hlh-cl-h2\">Environmental Compliance in Drydock Blasting<\/h2>\r\n<p>Drydock abrasive blasting is subject to increasingly stringent environmental regulation in port states and coastal nations. Key compliance requirements include: containment of spent abrasive and paint debris within the drydock basin (preventing marine environment discharge); dust suppression systems for enclosed dock blasting operations; and classification and disposal of spent abrasive as potentially hazardous waste if the blasted coatings contain lead, TBT (tributyltin), or other regulated substances.<\/p>\r\n<p>Garnet&#8217;s combination of low dust generation and low heavy-metal leachate makes it the preferred media for blasting operations in jurisdictions with the most stringent environmental requirements. For complete disposal and compliance guidance, see the <a href=\"https:\/\/hlh-js.com\/resource\/blog\/sandblasting-abrasive-disposal-and-environmental-compliance\/\" target=\"_blank\" rel=\"noopener\">Environmental Compliance guide<\/a>.<\/p>\r\n<\/section>\r\n<div class=\"hlh-cl-related\">\r\n<h3>Related Resources<\/h3>\r\n<div class=\"hlh-cl-related-grid\"><a class=\"hlh-cl-related-link\" href=\"https:\/\/hlh-js.com\/resource\/blog\/sandblasting-abrasives-types-grit-sizes-selection-guide\/\" target=\"_blank\" rel=\"noopener\">\ud83d\udcd6<\/a>\r\n<div><strong>Complete Buyer&#8217;s Guide<\/strong><em>All abrasive types &amp; selection<\/em><\/div>\r\n<a class=\"hlh-cl-related-link\" href=\"https:\/\/hlh-js.com\/resource\/blog\/garnet-sandblasting-abrasive\/\" target=\"_blank\" rel=\"noopener\">\u2b21<\/a>\r\n<div><strong>Garnet Guide<\/strong><em>Low-chloride, low-dust marine media<\/em><\/div>\r\n<a class=\"hlh-cl-related-link\" href=\"https:\/\/hlh-js.com\/resource\/blog\/steel-grit-abrasives-for-sandblasting\/\" target=\"_blank\" rel=\"noopener\">\u2b21<\/a>\r\n<div><strong>Steel Grit Guide<\/strong><em>Wheel-blast standard for newbuild<\/em><\/div>\r\n<a class=\"hlh-cl-related-link\" href=\"https:\/\/hlh-js.com\/resource\/blog\/garnet-vs-aluminum-oxide-blasting-abrasive\/\" target=\"_blank\" rel=\"noopener\">\u21c4<\/a>\r\n<div><strong>Garnet vs Aluminum Oxide<\/strong><em>Marine application comparison<\/em><\/div>\r\n<a class=\"hlh-cl-related-link\" href=\"https:\/\/hlh-js.com\/resource\/blog\/sandblasting-abrasive-disposal-and-environmental-compliance\/\" target=\"_blank\" rel=\"noopener\">\ud83c\udf3f<\/a>\r\n<div><strong>Environmental Compliance<\/strong><em>Drydock waste &amp; disposal<\/em><\/div>\r\n<a class=\"hlh-cl-related-link\" href=\"https:\/\/hlh-js.com\/resource\/blog\/sandblasting-abrasive-safety-regulations-osha\/\" target=\"_blank\" rel=\"noopener\">\u26a0<\/a>\r\n<div><strong>Safety &amp; OSHA Guide<\/strong><em>Drydock dust &amp; PPE requirements<\/em><\/div>\r\n<\/div>\r\n<\/div>\r\n<section id=\"hlh-cl-faq\">\r\n<h2 class=\"hlh-cl-h2\">FAQ<\/h2>\r\n<div class=\"hlh-cl-faq\">\r\n<div class=\"hlh-cl-faq-item\"><button class=\"hlh-cl-faq-q\">What is the best abrasive for ship hull blasting in drydock?<span class=\"hlh-cl-faq-icon\">+<\/span><\/button>\r\n<div class=\"hlh-cl-faq-a\">\r\n<p>GMA garnet (16\u201320 mesh) is the most widely specified abrasive for enclosed drydock hull blasting due to its combination of low dust generation, low chloride content, consistent surface profile, and simplified waste disposal. For large-scale newbuild operations where wheel-blast equipment is used on plate and profiles before erection, steel grit G25 GH is the standard. Both achieve the Sa 2.5 cleanliness required by major marine coating systems.<\/p>\r\n<\/div>\r\n<\/div>\r\n<div class=\"hlh-cl-faq-item\"><button class=\"hlh-cl-faq-q\">Can I use coal slag for ship hull blasting?<span class=\"hlh-cl-faq-icon\">+<\/span><\/button>\r\n<div class=\"hlh-cl-faq-a\">\r\n<p>Coal slag is occasionally used for hull blasting in outdoor shipyard areas where dust containment and media recovery are not required. However, coal slag&#8217;s higher dust generation, variable free silica content, and more complex waste disposal classification make it a less favourable choice than garnet for enclosed drydock operations. Most major marine coating specifications specify that the abrasive must meet SSPC AB-3 or equivalent and require verification of chloride and soluble salt content in the media \u2014 tests that coal slag may not consistently pass to the same standard as GMA garnet.<\/p>\r\n<\/div>\r\n<\/div>\r\n<\/div>\r\n<\/section>\r\n<div class=\"hlh-cl-final-cta\">\r\n<h2>Supply Your Marine Blasting Operations with Henglihong Technology Media<\/h2>\r\n<p>GMA garnet, steel grit, and aluminum oxide for shipbuilding and drydock maintenance blasting. ISO-compliant, low-chloride, available in bulk FCL quantities for international B2B buyers.<\/p>\r\n<div class=\"hlh-cl-cta-group\"><a class=\"hlh-cl-btn-primary\" href=\"https:\/\/hlh-js.com\/contact\/\" target=\"_blank\" rel=\"noopener\">Request a Quote<\/a><a class=\"hlh-cl-btn-outline\" href=\"https:\/\/hlh-js.com\/resource\/blog\/sandblasting-abrasives-bulk-supplier-wholesale\/\" target=\"_blank\" rel=\"noopener\">Wholesale Info \u2192<\/a><\/div>\r\n<\/div>\r\n<\/div>\r\n<p><script>function hlhClFaq(btn){var a=btn.nextElementSibling,open=btn.classList.contains('open');document.querySelectorAll('.hlh-cl-faq-q').forEach(function(b){b.classList.remove('open');if(b.nextElementSibling)b.nextElementSibling.style.display='none';});if(!open){btn.classList.add('open');a.style.display='block';}}<\/script><\/p>","protected":false},"excerpt":{"rendered":"<p>\u2190 Sandblasting Abrasives: Complete Buyer&#8217;s GuideBack to Pillar Page Series  [&#8230;]<\/p>","protected":false},"author":1,"featured_media":13006,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[62,175,138],"tags":[],"class_list":["post-12960","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-industry","category-resource"],"_links":{"self":[{"href":"https:\/\/hlh-js.com\/de\/wp-json\/wp\/v2\/posts\/12960","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hlh-js.com\/de\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hlh-js.com\/de\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hlh-js.com\/de\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/hlh-js.com\/de\/wp-json\/wp\/v2\/comments?post=12960"}],"version-history":[{"count":3,"href":"https:\/\/hlh-js.com\/de\/wp-json\/wp\/v2\/posts\/12960\/revisions"}],"predecessor-version":[{"id":13016,"href":"https:\/\/hlh-js.com\/de\/wp-json\/wp\/v2\/posts\/12960\/revisions\/13016"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hlh-js.com\/de\/wp-json\/wp\/v2\/media\/13006"}],"wp:attachment":[{"href":"https:\/\/hlh-js.com\/de\/wp-json\/wp\/v2\/media?parent=12960"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hlh-js.com\/de\/wp-json\/wp\/v2\/categories?post=12960"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hlh-js.com\/de\/wp-json\/wp\/v2\/tags?post=12960"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}