{"id":13179,"date":"2026-05-28T01:49:16","date_gmt":"2026-05-28T01:49:16","guid":{"rendered":"https:\/\/hlh-js.com\/?p=13179"},"modified":"2026-05-28T01:49:16","modified_gmt":"2026-05-28T01:49:16","slug":"sand-blasted-surface-roughness-chart-ra-rz-values-by-media-and-grit","status":"publish","type":"post","link":"https:\/\/hlh-js.com\/es\/resource\/blog\/sand-blasted-surface-roughness-chart-ra-rz-values-by-media-and-grit\/","title":{"rendered":"Sand Blasted Surface Roughness Chart: Ra &amp; Rz Values by Media and Grit"},"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\">Technical Reference<\/span>\n    <span class=\"hlh-art-date\">Published &middot; May 2026<\/span>\n  <\/div>\n  <h1>Sand Blasted Surface Roughness Chart: Ra &#038; Rz Values by Media and Grit<\/h1>\n  <p class=\"hlh-art-lede\">A consolidated reference of measured Ra and Rz roughness values across the six most common abrasive media, with grit-size breakdown, pressure-effect data, and substrate-hardness corrections \u2014 usable directly in coating specifications and supplier RFQs.<\/p>\n<\/section>\n\n<aside class=\"hlh-art-summary\">\n  <h2>Key Takeaways<\/h2>\n  <ul>\n    <li>Glass bead at #150\u2013#200 produces Ra 0.5\u20130.8 \u00b5m \u2014 the cosmetic matte range.<\/li>\n    <li>Aluminum oxide and garnet at #80\u2013#36 grit cover the Ra 1.8\u20133.5 \u00b5m range for general industrial coating prep.<\/li>\n    <li>Steel grit at G-40 produces Ra 3.6\u20135.0 \u00b5m, the standard for heavy fabrication and shipyard work.<\/li>\n    <li>Coal slag at 20\/40 mesh produces Ra 4.0\u20137.0 \u00b5m \u2014 the aggressive end of the spectrum used for field blasting.<\/li>\n  <\/ul>\n<\/aside>\n\n<nav class=\"hlh-art-toc\" aria-label=\"\u00cdndice\">\n  <h2>Table of Contents<\/h2>\n  <ol>\n    <li><a href=\"#intro\">How to Use This Chart<\/a><\/li>\n    <li><a href=\"#master-table\">Master Roughness Chart<\/a><\/li>\n    <li><a href=\"#pressure-effect\">Pressure Effect on Ra<\/a><\/li>\n    <li><a href=\"#substrate\">Substrate Hardness Correction<\/a><\/li>\n    <li><a href=\"#rz-vs-ra\">When to Specify Rz Instead of Ra<\/a><\/li>\n  <\/ol>\n<\/nav>\n\n<section id=\"intro\" class=\"hlh-art-section\">\n  <h2>How to Use This Chart<\/h2>\n  <p>This chart consolidates surface roughness data from industry standards bodies (SSPC, NACE, ISO 8503) and from production measurements collected by Jiangsu Henglihong Technology Co., Ltd. across mild steel substrates. Values are presented as ranges because actual roughness varies with pressure, distance, substrate hardness, and media wear state.<\/p>\n\n<p>For interpretation guidance \u2014 Ra vs Rz, how to specify, how to measure \u2014 see the <a href=\"https:\/\/hlh-js.com\/resource\/blog\/sand-blasted-surface\/\" target=\"_blank\" rel=\"noopener\">pillar guide on sand blasted surface specification<\/a> and the dedicated reference on <a href=\"https:\/\/hlh-js.com\/resource\/blog\/how-to-measure-sand-blasted-surface-profile-replica-tape-comparator-stylus\/\" target=\"_blank\" rel=\"noopener\">how to measure sand blasted surface profile<\/a>.<\/p>\n\n<div class=\"hlh-art-callout\">\n  <div class=\"hlh-art-callout-title\">Test Conditions<\/div>\n  <p>All values below assume blast pressure of 90 psi at the nozzle, working distance 300 mm, impact angle 75\u00b0, on mild steel substrate (~150 HB). Adjust \u00b120% for variations in pressure or substrate hardness.<\/p>\n<\/div>\n<\/section>\n\n<section id=\"master-table\" class=\"hlh-art-section\">\n  <h2>Master Roughness Chart<\/h2>\n  <div class=\"hlh-art-table-wrap\">\n<table>\n  <thead><tr><th>Media<\/th><th>Grit \/ Mesh<\/th><th>Ra (\u00b5m)<\/th><th>Rz (\u00b5m)<\/th><th>Typical Application<\/th><\/tr><\/thead>\n  <tbody>\n    <tr><td rowspan=\"3\">Glass Bead<\/td><td>#220<\/td><td><strong>0.4 &ndash; 0.6<\/strong><\/td><td>2.5 &ndash; 3.5<\/td><td>Cosmetic premium matte<\/td><\/tr>\n    <tr><td>#170<\/td><td><strong>0.5 &ndash; 0.8<\/strong><\/td><td>3.0 &ndash; 4.5<\/td><td>Pre-anodize aluminum, surgical instruments<\/td><\/tr>\n    <tr><td>#100<\/td><td><strong>0.8 &ndash; 1.2<\/strong><\/td><td>4.5 &ndash; 6.5<\/td><td>General cosmetic blast<\/td><\/tr>\n    <tr><td rowspan=\"4\">\u00d3xido de aluminio<\/td><td>#180<\/td><td><strong>1.0 &ndash; 1.3<\/strong><\/td><td>6.0 &ndash; 8.0<\/td><td>Stainless steel cosmetic + prep<\/td><\/tr>\n    <tr><td>#120<\/td><td><strong>1.3 &ndash; 1.7<\/strong><\/td><td>8.0 &ndash; 10<\/td><td>General coating preparation<\/td><\/tr>\n    <tr><td>#80<\/td><td><strong>1.8 &ndash; 2.3<\/strong><\/td><td>10 &ndash; 14<\/td><td>Industrial coating prep, aerospace primer<\/td><\/tr>\n    <tr><td>#36<\/td><td><strong>3.2 &ndash; 4.0<\/strong><\/td><td>18 &ndash; 24<\/td><td>Heavy fabrication prep<\/td><\/tr>\n    <tr><td rowspan=\"3\">Granate<\/td><td>80 mesh<\/td><td><strong>1.5 &ndash; 2.0<\/strong><\/td><td>9 &ndash; 12<\/td><td>Stainless prep, marine touch-up<\/td><\/tr>\n    <tr><td>30\/60 mesh<\/td><td><strong>2.5 &ndash; 3.5<\/strong><\/td><td>15 &ndash; 22<\/td><td>Marine, offshore, structural steel<\/td><\/tr>\n    <tr><td>20\/40 mesh<\/td><td><strong>4.0 &ndash; 5.5<\/strong><\/td><td>25 &ndash; 32<\/td><td>Aggressive structural blast<\/td><\/tr>\n    <tr><td rowspan=\"3\">Granalla de acero<\/td><td>G-80<\/td><td><strong>2.0 &ndash; 2.8<\/strong><\/td><td>12 &ndash; 16<\/td><td>Pre-paint, fine industrial<\/td><\/tr>\n    <tr><td>G-40<\/td><td><strong>3.6 &ndash; 5.0<\/strong><\/td><td>22 &ndash; 30<\/td><td>Heavy fabrication, shipyards<\/td><\/tr>\n    <tr><td>G-25<\/td><td><strong>5.5 &ndash; 7.5<\/strong><\/td><td>35 &ndash; 45<\/td><td>Aggressive descaling<\/td><\/tr>\n    <tr><td rowspan=\"2\">Disparo de acero<\/td><td>S-330<\/td><td><strong>2.0 &ndash; 3.0<\/strong><\/td><td>12 &ndash; 18<\/td><td>Castings, shot peening<\/td><\/tr>\n    <tr><td>S-460<\/td><td><strong>3.0 &ndash; 4.5<\/strong><\/td><td>18 &ndash; 26<\/td><td>Heavy castings, structural<\/td><\/tr>\n    <tr><td rowspan=\"2\">Coal Slag<\/td><td>30\/60 mesh<\/td><td><strong>2.5 &ndash; 4.0<\/strong><\/td><td>15 &ndash; 25<\/td><td>General field blasting<\/td><\/tr>\n    <tr><td>20\/40 mesh<\/td><td><strong>4.0 &ndash; 7.0<\/strong><\/td><td>25 &ndash; 42<\/td><td>Heavy field blasting<\/td><\/tr>\n  <\/tbody>\n<\/table>\n<\/div>\n<\/section>\n\n<section id=\"pressure-effect\" class=\"hlh-art-section\">\n  <h2>Pressure Effect on Ra<\/h2>\n  <p>Holding media constant, blast pressure has a strong but non-linear effect on Ra. The following shows the effect for aluminum oxide #80 grit on mild steel:<\/p>\n\n<div class=\"hlh-art-table-wrap\">\n<table>\n  <thead><tr><th>Pressure<\/th><th>Velocity<\/th><th>Resulting Ra (\u00b5m)<\/th><\/tr><\/thead>\n  <tbody>\n    <tr><td>60 psi<\/td><td>~110 m\/s<\/td><td>1.4 &ndash; 1.6<\/td><\/tr>\n    <tr><td>80 psi<\/td><td>~135 m\/s<\/td><td>1.7 &ndash; 1.9<\/td><\/tr>\n    <tr><td>90 psi<\/td><td>~150 m\/s<\/td><td>1.8 &ndash; 2.3<\/td><\/tr>\n    <tr><td>100 psi<\/td><td>~162 m\/s<\/td><td>2.1 &ndash; 2.6<\/td><\/tr>\n    <tr><td>110 psi<\/td><td>~175 m\/s<\/td><td>2.3 &ndash; 2.9<\/td><\/tr>\n  <\/tbody>\n<\/table>\n<\/div>\n\n<p>Above ~110 psi, pressure increases produce diminishing Ra returns because the failure mode shifts from substrate cratering to media fracture. The four-parameter interaction is explained more fully in our guide on <a href=\"https:\/\/hlh-js.com\/resource\/blog\/how-sandblasting-works-pressure-nozzle-distance-angle-parameters\/\" target=\"_blank\" rel=\"noopener\">how sandblasting works: pressure, nozzle distance, and angle parameters<\/a>.<\/p>\n<\/section>\n\n<section id=\"substrate\" class=\"hlh-art-section\">\n  <h2>Substrate Hardness Correction<\/h2>\n  <p>Softer substrates accept deeper craters and produce higher Ra at identical parameters. Approximate correction factors relative to mild steel (~150 HB):<\/p>\n\n<div class=\"hlh-art-table-wrap\">\n<table>\n  <thead><tr><th>Substrate<\/th><th>Dureza<\/th><th>Ra Multiplier<\/th><\/tr><\/thead>\n  <tbody>\n    <tr><td>Aluminum 6061-T6<\/td><td>~95 HB<\/td><td>~1.4&times;<\/td><\/tr>\n    <tr><td>Mild steel A36<\/td><td>~150 HB<\/td><td>1.0&times; (baseline)<\/td><\/tr>\n    <tr><td>Stainless 304<\/td><td>~180 HB<\/td><td>~0.9&times;<\/td><\/tr>\n    <tr><td>Stainless 316L<\/td><td>~200 HB<\/td><td>~0.85&times;<\/td><\/tr>\n    <tr><td>Tool steel D2 hardened<\/td><td>~600 HB<\/td><td>~0.4&times;<\/td><\/tr>\n  <\/tbody>\n<\/table>\n<\/div>\n\n<p>For aluminum, the higher Ra multiplier means glass bead alone often provides sufficient profile depth; coarser media risks over-blasting and warping in thin sections. See our material-specific guidance for <a href=\"https:\/\/hlh-js.com\/resource\/blog\/sand-blasted-aluminum-pre-anodizing-bead-blast-specifications-mil-a-8625\/\" target=\"_blank\" rel=\"noopener\">sand blasted aluminum pre-anodizing specifications<\/a>.<\/p>\n<\/section>\n\n<section id=\"rz-vs-ra\" class=\"hlh-art-section\">\n  <h2>When to Specify Rz Instead of Ra<\/h2>\n  <p>Ra is the average; Rz is the peak-to-valley extreme. For coating adhesion work, Rz frequently matters more because it directly measures the anchor pattern depth coatings grip. Coating manufacturers increasingly specify Rz alongside or instead of Ra.<\/p>\n\n<ul>\n  <li><strong>Use Ra when:<\/strong> Cosmetic uniformity is the goal; substrate is being prepared for thick high-build coating; legacy specifications use Ra.<\/li>\n  <li><strong>Use Rz when:<\/strong> Anchor pattern depth matters; thin coatings risk profile telegraphing; matching coating manufacturer requirements.<\/li>\n<\/ul>\n\n<p>The relationship between profile depth and coating DFT is detailed in 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<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\/how-sandblasting-works-pressure-nozzle-distance-angle-parameters\/\" target=\"_blank\" rel=\"noopener\">How Sandblasting Works: Pressure, Nozzle Distance &#038; Angle Parameters<\/a>\n    <\/div>\n    <div class=\"hlh-art-related-card\">\n      <a href=\"https:\/\/hlh-js.com\/resource\/blog\/how-to-measure-sand-blasted-surface-profile-replica-tape-comparator-stylus\/\" target=\"_blank\" rel=\"noopener\">How to Measure Sand Blasted Surface Profile<\/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\/what-does-a-sand-blasted-surface-look-like-visual-guide-with-ra-examples\/\" target=\"_blank\" rel=\"noopener\">What Does a Sand Blasted Surface Look Like?<\/a>\n    <\/div>\n  <\/div>\n<\/section>\n\n<section id=\"faq\" class=\"hlh-art-section hlh-art-faq\">\n  <h2>Preguntas frecuentes<\/h2>\n  <details>\n    <summary>What Ra value does sandblasting produce?<\/summary>\n    <div class=\"hlh-art-faq-body\"><p>Practical Ra ranges from 0.4 \u00b5m with fine glass bead to 7.5 \u00b5m with coarse steel grit. The most common industrial range is Ra 1.5\u20134.0 \u00b5m, achieved with aluminum oxide or garnet at #80\u201330 grit.<\/p><\/div>\n  <\/details>\n  <details>\n    <summary>What is the difference between Ra and Rz?<\/summary>\n    <div class=\"hlh-art-faq-body\"><p>Ra is the arithmetic mean roughness \u2014 the average deviation from the mean line. Rz is the average maximum peak-to-valley height across the sampling length. Rz is typically 5\u20138\u00d7 higher than Ra for the same surface.<\/p><\/div>\n  <\/details>\n  <details>\n    <summary>Why does my measured Ra differ from chart values?<\/summary>\n    <div class=\"hlh-art-faq-body\"><p>Chart values are starting points based on baseline conditions. Actual production Ra varies with pressure at the nozzle (not the compressor), media wear, substrate hardness, and operator overlap. Variations of \u00b125% are normal.<\/p><\/div>\n  <\/details>\n  <details>\n    <summary>Which media gives the most consistent Ra?<\/summary>\n    <div class=\"hlh-art-faq-body\"><p>Aluminum oxide produces the most consistent Ra because the angular synthetic media has tightly controlled particle size distribution and breakdown behavior. Garnet is also consistent. Coal slag has the widest variation.<\/p><\/div>\n  <\/details>\n  <details>\n    <summary>Does media wear change Ra?<\/summary>\n    <div class=\"hlh-art-faq-body\"><p>Significantly. Fresh sharp media at the start of a blast cycle produces deeper Ra than worn media. Closed-loop recycling systems that monitor media maintain consistency; open-loop systems show progressive Ra reduction.<\/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 Surface Roughness Chart: Ra & Rz Values by Media and Grit\",\n            \"description\": \"A consolidated reference of measured Ra and Rz roughness values across the six most common abrasive media, with grit-size breakdown, pressure-effect data, and substrate-hardness corrections \\u2014 usable directly in coating specifications and supplier RFQs.\",\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-surface-roughness-chart-ra-rz-values-by-media-and-grit\\\/\"\n        },\n        {\n            \"@type\": \"FAQPage\",\n            \"mainEntity\": [\n                {\n                    \"@type\": \"Question\",\n                    \"name\": \"What Ra value does sandblasting produce?\",\n                    \"acceptedAnswer\": {\n                        \"@type\": \"Answer\",\n                        \"text\": \"Practical Ra ranges from 0.4 \\u00b5m with fine glass bead to 7.5 \\u00b5m with coarse steel grit. 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Rz is typically 5\\u20138\\u00d7 higher than Ra for the same surface.\"\n                    }\n                },\n                {\n                    \"@type\": \"Question\",\n                    \"name\": \"Why does my measured Ra differ from chart values?\",\n                    \"acceptedAnswer\": {\n                        \"@type\": \"Answer\",\n                        \"text\": \"Chart values are starting points based on baseline conditions. Actual production Ra varies with pressure at the nozzle (not the compressor), media wear, substrate hardness, and operator overlap. Variations of \\u00b125% are normal.\"\n                    }\n                },\n                {\n                    \"@type\": \"Question\",\n                    \"name\": \"Which media gives the most consistent Ra?\",\n                    \"acceptedAnswer\": {\n                        \"@type\": \"Answer\",\n                        \"text\": \"Aluminum oxide produces the most consistent Ra because the angular synthetic media has tightly controlled particle size distribution and breakdown behavior. Garnet is also consistent. Coal slag has the widest variation.\"\n                    }\n                },\n                {\n                    \"@type\": \"Question\",\n                    \"name\": \"Does media wear change Ra?\",\n                    \"acceptedAnswer\": {\n                        \"@type\": \"Answer\",\n                        \"text\": \"Significantly. Fresh sharp media at the start of a blast cycle produces deeper Ra than worn media. Closed-loop recycling systems that monitor media maintain consistency; open-loop systems show progressive Ra reduction.\"\n                    }\n                }\n            ]\n        }\n    ]\n}<\/script>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Technical Reference Published &middot; May 2026 Sand Blasted Surface Roughness  [&#8230;]<\/p>","protected":false},"author":1,"featured_media":13228,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[62,175,138],"tags":[],"class_list":["post-13179","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-industry","category-resource"],"_links":{"self":[{"href":"https:\/\/hlh-js.com\/es\/wp-json\/wp\/v2\/posts\/13179","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hlh-js.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hlh-js.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hlh-js.com\/es\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/hlh-js.com\/es\/wp-json\/wp\/v2\/comments?post=13179"}],"version-history":[{"count":2,"href":"https:\/\/hlh-js.com\/es\/wp-json\/wp\/v2\/posts\/13179\/revisions"}],"predecessor-version":[{"id":13181,"href":"https:\/\/hlh-js.com\/es\/wp-json\/wp\/v2\/posts\/13179\/revisions\/13181"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hlh-js.com\/es\/wp-json\/wp\/v2\/media\/13228"}],"wp:attachment":[{"href":"https:\/\/hlh-js.com\/es\/wp-json\/wp\/v2\/media?parent=13179"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hlh-js.com\/es\/wp-json\/wp\/v2\/categories?post=13179"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hlh-js.com\/es\/wp-json\/wp\/v2\/tags?post=13179"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}