{"id":12709,"date":"2026-04-07T02:49:16","date_gmt":"2026-04-07T02:49:16","guid":{"rendered":"https:\/\/hlh-js.com\/?p=12709"},"modified":"2026-04-07T02:49:16","modified_gmt":"2026-04-07T02:49:16","slug":"angular-vs-round-blasting-media-surface-profile-finish-differences","status":"publish","type":"post","link":"https:\/\/hlh-js.com\/de\/resource\/blog\/angular-vs-round-blasting-media-surface-profile-finish-differences\/","title":{"rendered":"Angular vs Round Blasting Media: Surface Profile &amp; Finish Differences"},"content":{"rendered":"<!-- ============================================================\n     JIANGSU HENGLIHONG TECHNOLOGY CO., LTD.\n     Article B-3: Angular vs Round Blasting Media\n     Target URL: https:\/\/hlh-js.com\/resource\/blog\/angular-vs-round-blasting-media-surface-profile-finish-differences\/\n     Last updated: April 2026\n     ============================================================ -->\n<script type=\"application\/ld+json\">{\n    \"@context\": \"https:\\\/\\\/schema.org\",\n    \"@graph\": [\n        {\n            \"@type\": \"Article\",\n            \"headline\": \"Angular vs Round Blasting Media: Surface Profile & Finish Differences\",\n            \"description\": \"Technical deep-dive into how particle shape drives surface outcomes in abrasive blasting \\u2014 anchor profiles from angular grit vs compressive peen from spherical shot, with data on Ra, Rz, fatigue life, and coating adhesion. By Jiangsu Henglihong Technology Co., Ltd.\",\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            \"datePublished\": \"2026-04-01\",\n            \"dateModified\": \"2026-04-01\",\n            \"mainEntityOfPage\": {\n                \"@type\": \"WebPage\",\n                \"@id\": \"https:\\\/\\\/hlh-js.com\\\/resource\\\/blog\\\/angular-vs-round-blasting-media-surface-profile-finish-differences\\\/\"\n            }\n        },\n        {\n            \"@type\": \"BreadcrumbList\",\n            \"itemListElement\": [\n                {\n                    \"@type\": \"ListItem\",\n                    \"position\": 1,\n                    \"name\": \"Home\",\n                    \"item\": \"https:\\\/\\\/hlh-js.com\\\/\"\n                },\n                {\n                    \"@type\": \"ListItem\",\n                    \"position\": 2,\n                    \"name\": \"Resources\",\n                    \"item\": \"https:\\\/\\\/hlh-js.com\\\/resource\\\/\"\n                },\n                {\n                    \"@type\": \"ListItem\",\n                    \"position\": 3,\n                    \"name\": \"Blog\",\n                    \"item\": \"https:\\\/\\\/hlh-js.com\\\/resource\\\/blog\\\/\"\n                },\n                {\n                    \"@type\": \"ListItem\",\n                    \"position\": 4,\n                    \"name\": \"Angular vs Round Blasting Media: Surface Profile & Finish Differences\",\n                    \"item\": \"https:\\\/\\\/hlh-js.com\\\/resource\\\/blog\\\/angular-vs-round-blasting-media-surface-profile-finish-differences\\\/\"\n                }\n            ]\n        },\n        {\n            \"@type\": \"FAQPage\",\n            \"mainEntity\": [\n                {\n                    \"@type\": \"Question\",\n                    \"name\": \"What is the difference between angular and round blasting media?\",\n                    \"acceptedAnswer\": {\n                        \"@type\": \"Answer\",\n                        \"text\": \"Angular blasting media (steel grit, aluminum oxide, garnet, silicon carbide) has sharp, irregular edges that cut into the surface on impact, creating peaks and valleys \\u2014 the anchor profile needed for coating adhesion. Round blasting media (steel shot, glass beads) impacts the surface without cutting, producing overlapping spherical dimples that compress the surface layer, induce compressive residual stress, and create a smooth, peened finish. The choice between angular and round is determined by whether the goal is coating adhesion (angular) or peening\\\/decorative finish (round).\"\n                    }\n                },\n                {\n                    \"@type\": \"Question\",\n                    \"name\": \"Does angular or round media remove more material?\",\n                    \"acceptedAnswer\": {\n                        \"@type\": \"Answer\",\n                        \"text\": \"Angular media removes significantly more material than round media at equivalent blasting conditions. Angular particles cut and abrade the substrate, removing measurable material with each impact. Round particles compress the surface without removing material \\u2014 their action is more akin to hammering than cutting. For applications where dimensional integrity is critical, round media (glass beads, steel shot) is preferred precisely because it does not remove measurable substrate material.\"\n                    }\n                },\n                {\n                    \"@type\": \"Question\",\n                    \"name\": \"Which blasting media gives the best coating adhesion?\",\n                    \"acceptedAnswer\": {\n                        \"@type\": \"Answer\",\n                        \"text\": \"Angular media gives the best coating adhesion by creating a rough anchor profile \\u2014 the peaks and valleys that coatings mechanically interlock with. The optimal anchor profile depth depends on the specific coating system: most industrial epoxy and polyurethane primers require 40\\u201375 \\u00b5m Rz at Sa 2.5 cleanliness. Steel grit, aluminum oxide, and garnet (all angular) are the most widely used media for coating adhesion preparation. Round media such as steel shot does not create adequate anchor profiles for most coating systems.\"\n                    }\n                }\n            ]\n        }\n    ]\n}<\/script>\n\n<style>\n.hlh-b3*,.hlh-b3*::before,.hlh-b3*::after{box-sizing:border-box;margin:0;padding:0}\n.hlh-b3{font-family:'Segoe UI',Arial,sans-serif;font-size:16px;line-height:1.8;color:#1a1a2e;max-width:960px;margin:0 auto;padding:0 16px 60px}\n.hlh-b3 .hlh-hero{background:linear-gradient(135deg,#1A5276 0%,#0d2d47 100%);border-radius:12px;padding:52px 44px;margin-bottom:48px;position:relative;overflow:hidden}\n.hlh-b3 .hlh-hero::before{content:'';position:absolute;top:-60px;right:-60px;width:260px;height:260px;border-radius:50%;background:rgba(255,255,255,0.04)}\n.hlh-b3 .hlh-hero-label{display:inline-block;background:rgba(255,255,255,0.12);color:#AED6F1;font-size:12px;font-weight:600;letter-spacing:.1em;text-transform:uppercase;padding:4px 12px;border-radius:20px;margin-bottom:20px}\n.hlh-b3 .hlh-hero 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strong{color:#0d2d47}\n@media(max-width:640px){.hlh-b3 .hlh-hero{padding:34px 22px}.hlh-b3 .hlh-cta{padding:30px 22px}.hlh-b3 .hlh-two-col{grid-template-columns:1fr}}\n<\/style>\n\n<div class=\"hlh-b3\">\n\n  <div class=\"hlh-hero\">\n    <div class=\"hlh-hero-label\">Selection Guide<\/div>\n    <h1>Angular vs Round Blasting Media: Surface Profile &amp; Finish Differences<\/h1>\n    <p>A technical deep-dive into how particle shape drives surface outcomes \u2014 from anchor profiles and coating adhesion with angular grit, to compressive peening and decorative finishing with spherical shot. Includes data on Ra, Rz, fatigue life improvement, and practical selection guidance.<\/p>\n    <div class=\"hlh-hero-meta\">\n      <span>Published April 2026<\/span>\n      <span>By Jiangsu Henglihong Technology Co., Ltd.<\/span>\n      <span>~2,200 words \u00b7 10 min read<\/span>\n    <\/div>\n  <\/div>\n\n  <div class=\"hlh-toc\">\n    <div class=\"hlh-toc-title\">Table of Contents<\/div>\n    <ol>\n      <li><a href=\"#the-fundamental-difference\">The Fundamental Difference<\/a><\/li>\n      <li><a href=\"#angular-mechanics\">How Angular Media Works<\/a><\/li>\n      <li><a href=\"#round-mechanics\">How Spherical Media Works<\/a><\/li>\n      <li><a href=\"#profile-data\">Surface Profile Data Comparison<\/a><\/li>\n      <li><a href=\"#coating-adhesion\">Coating Adhesion: Why Angular Wins<\/a><\/li>\n      <li><a href=\"#fatigue-life\">Fatigue Life: Why Round Wins<\/a><\/li>\n      <li><a href=\"#blending\">Blending Angular and Round<\/a><\/li>\n      <li><a href=\"#media-examples\">Angular vs Round by Media Type<\/a><\/li>\n      <li><a href=\"#decision-guide\">Decision Guide<\/a><\/li>\n      <li><a href=\"#faq\">H\u00e4ufig gestellte Fragen<\/a><\/li>\n    <\/ol>\n  <\/div>\n\n  <h2 id=\"the-fundamental-difference\">The Fundamental Difference<\/h2>\n  <p class=\"hlh-lead\">Particle shape is the single most important morphological property of any abrasive blasting media, determining the fundamental mechanism by which the particle interacts with the substrate surface on impact. Everything else \u2014 hardness, size, density \u2014 modulates this interaction. Shape defines its character.<\/p>\n  <p>The distinction is clean and binary: <strong>angular particles cut; spherical particles peen.<\/strong> These are not just different outcomes \u2014 they are opposite mechanisms that produce opposite surface conditions. A surface blasted with angular grit and a surface blasted with spherical shot are as different from each other as a machined surface and a hammered one.<\/p>\n  <p>Understanding this difference is not academic \u2014 it determines whether a coating will adhere for its intended service life, whether a component will achieve its required fatigue life, and whether a decorative finish will meet specification. Selecting the wrong shape class is not compensable by adjusting other parameters.<\/p>\n\n  <h2 id=\"angular-mechanics\">How Angular Media Works: The Cutting Mechanism<\/h2>\n  <p>Angular blast media particles \u2014 produced by crushing, fracturing, or controlled solidification of abrasive materials \u2014 have sharp edges and irregular, faceted surfaces. When an angular particle impacts a surface at high velocity, several things happen simultaneously:<\/p>\n  <ul>\n    <li>The particle&#8217;s leading edge or corner concentrates the impact force into a small area, generating very high localized pressure \u2014 far exceeding the substrate&#8217;s yield strength.<\/li>\n    <li>This concentrated force shears and displaces surface material, creating a small crater with raised edges (the &#8220;peak&#8221;) and a depressed center (the &#8220;valley&#8221;).<\/li>\n    <li>The material displaced from the crater piles up at the crater&#8217;s rim, forming sharp peaks in the surface micro-topography.<\/li>\n    <li>Thousands of overlapping such impacts across the entire surface area create the characteristic &#8220;angular anchor profile&#8221; \u2014 a forest of sharp peaks and valleys with a defined roughness depth.<\/li>\n  <\/ul>\n  <p>This profiling action simultaneously cleans the surface (removing rust, scale, paint, and contamination), roughens it to a defined depth, and creates surface tensile stress in the deformed peaks \u2014 a state that is actually beneficial for coating adhesion, as the mechanical interlocking of coating material with the profile peaks provides the primary adhesion mechanism.<\/p>\n\n  <h3>Angular Media Examples<\/h3>\n  <ul>\n    <li><strong>Stahlkorn<\/strong> \u2014 produced by crushing hardened steel shot; hardness 54\u201365 HRC; the most widely used angular media for structural steel preparation<\/li>\n    <li><strong>Aluminiumoxid<\/strong> \u2014 synthetic angular abrasive; Mohs 9; preferred for precision profiling and thermal spray bond coat preparation<\/li>\n    <li><strong>Siliziumkarbid<\/strong> \u2014 hardest angular abrasive; Mohs 9\u20139.5; used for ceramics and hardened steel<\/li>\n    <li><strong>Granat<\/strong> \u2014 natural mineral angular abrasive; Mohs 7\u20138; preferred for marine and eco-sensitive applications<\/li>\n    <li><strong>Crushed glass<\/strong> \u2014 recycled glass angular abrasive; Mohs 5.5\u20136; used for general outdoor blasting<\/li>\n  <\/ul>\n\n  <h2 id=\"round-mechanics\">How Spherical Media Works: The Peening Mechanism<\/h2>\n  <p>Spherical blast media particles \u2014 produced by water atomization (steel shot), precision glass manufacturing (glass beads), or controlled powder metallurgy \u2014 have no sharp edges. When a spherical particle impacts a surface at high velocity, the mechanics are fundamentally different:<\/p>\n  <ul>\n    <li>The impact force is distributed across the entire spherical contact area rather than concentrated at an edge \u2014 much lower peak pressure than an angular particle of comparable size and mass.<\/li>\n    <li>The surface material is compressed downward and outward from the impact point, but is not sheared or removed. The surface material deforms plastically without material loss.<\/li>\n    <li>The compressed material rebounds slightly but retains a net downward displacement, creating a shallow, smooth, rounded dimple in the surface.<\/li>\n    <li>Repeated impacts across the entire surface accumulate compressive residual stress in the surface layer \u2014 the defining benefit of shot peening \u2014 while producing an overlapping pattern of smooth dimples with no sharp peaks.<\/li>\n  <\/ul>\n  <p>The resulting surface is characterized by a uniform, non-directional texture with a bright, smooth appearance. The compressive stress layer \u2014 typically extending 0.1\u20130.5 mm below the surface depending on shot size and intensity \u2014 is the mechanism behind fatigue life improvement. Cracks initiate in tensile stress fields; compressive stress at the surface inhibits crack initiation and slows propagation.<\/p>\n\n  <h3>Spherical Media Examples<\/h3>\n  <ul>\n    <li><strong>Stahlschrot<\/strong> \u2014 water-atomized steel spheres; hardness 40\u201351 HRC; dominant media for heavy industrial and automotive shot peening<\/li>\n    <li><strong>Glasperlen<\/strong> \u2014 precision lead-free soda-lime glass spheres; Mohs 5.5\u20136; preferred for light peening, decorative finishing, and iron-free applications<\/li>\n    <li><strong>Schrot aus rostfreiem Stahl<\/strong> \u2014 for peening stainless steel and non-ferrous substrates where iron contamination from carbon steel shot is unacceptable<\/li>\n    <li><strong>Ceramic shot (zirconia)<\/strong> \u2014 used in high-precision aerospace peening where contamination and consistency requirements are the most demanding<\/li>\n  <\/ul>\n\n  <h2 id=\"profile-data\">Surface Profile Data: Angular vs Round<\/h2>\n  <div class=\"hlh-table-wrap\">\n    <table>\n      <thead>\n        <tr><th>Media Type &amp; Size<\/th><th>Ra (\u00b5m)<\/th><th>Rz (\u00b5m)<\/th><th>Profile Character<\/th><th>Material Removal<\/th><th>Residual Stress<\/th><\/tr>\n      <\/thead>\n      <tbody>\n        <tr><td>Steel Grit GH G-25<\/td><td>10\u201318<\/td><td>70\u2013140<\/td><td>Sharp peaks, deep valleys<\/td><td>Significant<\/td><td>Tensile at surface<\/td><\/tr>\n        <tr><td>Steel Grit GL G-50<\/td><td>5\u201310<\/td><td>35\u201370<\/td><td>Medium angular profile<\/td><td>M\u00e4\u00dfig<\/td><td>Slight tensile<\/td><\/tr>\n        <tr><td>Al\u2082O\u2083 F36\u2013F60<\/td><td>4\u201310<\/td><td>30\u201370<\/td><td>Sharp angular, consistent<\/td><td>M\u00e4\u00dfig<\/td><td>Slight tensile<\/td><\/tr>\n        <tr><td>Garnet 30\/60 mesh<\/td><td>4\u20138<\/td><td>30\u201355<\/td><td>Angular, low dust<\/td><td>M\u00e4\u00dfig<\/td><td>Slight tensile<\/td><\/tr>\n        <tr><td>Steel Shot S-330<\/td><td>2\u20135<\/td><td>10-30<\/td><td>Smooth rounded dimples<\/td><td>Keine<\/td><td class=\"td-good\">Compressive<\/td><\/tr>\n        <tr><td>Steel Shot S-460<\/td><td>3\u20137<\/td><td>15\u201345<\/td><td>Smooth rounded dimples<\/td><td>Keine<\/td><td class=\"td-good\">Compressive<\/td><\/tr>\n        <tr><td>Glass Bead US 100\u2013170<\/td><td>0.5\u20131.5<\/td><td>3\u201310<\/td><td>Fine uniform dimples<\/td><td>Keine<\/td><td class=\"td-good\">Compressive (light)<\/td><\/tr>\n        <tr><td>Shot\/Grit Blend (50\/50)<\/td><td>4\u20138<\/td><td>25\u201355<\/td><td>Angular profile, smoothed peaks<\/td><td>Low\u2013Moderate<\/td><td>Near neutral<\/td><\/tr>\n      <\/tbody>\n    <\/table>\n  <\/div>\n\n  <h2 id=\"coating-adhesion\">Coating Adhesion: Why Angular Media Is Required<\/h2>\n  <p>Coating adhesion to steel depends on two mechanisms: <strong>mechanical interlocking<\/strong> (the coating material flows into surface peaks and valleys and locks mechanically as it cures) and <strong>chemical bonding<\/strong> (atomic-scale adhesion between coating and clean substrate). Both mechanisms depend on surface preparation \u2014 but for industrial protective coatings in demanding environments, mechanical interlocking is the dominant adhesion mechanism, and it requires an adequate anchor profile.<\/p>\n  <p>Research on coating adhesion failure consistently shows that the most common cause of premature protective coating failure in service is inadequate surface preparation \u2014 either insufficient cleanliness (residual contamination blocking chemical bonding) or insufficient anchor profile depth (insufficient mechanical interlocking). Both problems are directly related to blast media selection and process parameters.<\/p>\n\n  <div class=\"hlh-box hlh-box-blue\">\n    <div class=\"hlh-box-title\">Why Round Media Cannot Replace Angular for Coating Prep<\/div>\n    <p>Steel shot and glass beads produce Ra values of 1\u20135 \u00b5m and Rz values of 5\u201330 \u00b5m at typical sizes and pressures. Most industrial coating systems require Rz 40\u201375 \u00b5m minimum for adequate adhesion \u2014 a profile that spherical media simply cannot achieve regardless of size or pressure, because the spherical impact geometry fundamentally limits how deep the surface is profiled. Using round media for coating preparation is a technically incorrect approach that leads to premature coating failure.<\/p>\n  <\/div>\n\n  <h2 id=\"fatigue-life\">Fatigue Life Improvement: Why Spherical Media Is Required<\/h2>\n  <p>Shot peening \u2014 the controlled application of spherical blast media to a surface \u2014 is a well-established engineering process for improving the fatigue life of metallic components subjected to cyclic loading. The mechanism is the introduction of compressive residual stress in the surface layer, which must be induced by a spherical, non-cutting impact mechanism.<\/p>\n  <p>Angular media cannot perform shot peening because:<\/p>\n  <ul>\n    <li>Angular particles cut the surface rather than compress it, generating tensile stress at the crater rim rather than the uniform compressive stress field required for peening benefit.<\/li>\n    <li>The sharp-edged impacts from angular media create stress concentrations \u2014 notches and micro-cracks at impact sites \u2014 that can actually initiate fatigue damage rather than inhibit it.<\/li>\n    <li>Angular impact produces inconsistent, direction-dependent stress patterns rather than the isotropic compressive stress field that peening specifications require.<\/li>\n  <\/ul>\n  <p>Fatigue life improvements from properly executed shot peening typically range from 20% to 300% depending on the component geometry, material, and loading conditions. These improvements are quantified by Almen intensity measurements (using standardized Almen strip test pieces) and coverage percentage measurements \u2014 both of which require spherical media to be valid.<\/p>\n\n  <h2 id=\"blending\">Blending Angular and Round: Getting Both Benefits<\/h2>\n  <p>Many high-production structural steel blasting operations use mixed shot\/grit media \u2014 typically 20\u201370% grit with the balance shot \u2014 to simultaneously achieve two objectives: the angular grit component creates the anchor profile required for coating adhesion, while the shot component rounds off the sharpest peak tips, reducing the peak-to-valley ratio (Rz) without reducing the overall profile depth (Ra).<\/p>\n  <p>This &#8220;optimized profile&#8221; approach \u2014 well-established in shipyard and structural steel fabrication blasting \u2014 produces a surface that:<\/p>\n  <ul>\n    <li>Has adequate profile depth for coating adhesion (Ra 5\u201310 \u00b5m, Rz 35\u201370 \u00b5m)<\/li>\n    <li>Has a smoother peak distribution than pure grit blasting, reducing coating consumption at the profile peaks<\/li>\n    <li>Achieves higher throughput than pure angular blasting due to the shot component&#8217;s cleaning efficiency on large flat surfaces<\/li>\n    <li>Meets Sa 2.5 cleanliness requirements consistently<\/li>\n  <\/ul>\n  <p>The optimal blend ratio is determined empirically for each operation by running test panels with varying blend ratios and measuring the resulting profile parameters against the coating specification.<\/p>\n\n  <h2 id=\"media-examples\">Angular vs Round: Summary by Media Type<\/h2>\n  <div class=\"hlh-two-col\">\n    <div class=\"hlh-col-card\">\n      <h4>Angular Media<\/h4>\n      <ul>\n        <li>Steel Grit (GP, GL, GH)<\/li>\n        <li>Aluminum Oxide (Brown &amp; White)<\/li>\n        <li>Silicon Carbide (Black &amp; Green)<\/li>\n        <li>Garnet (Almandine)<\/li>\n        <li>Crushed Glass<\/li>\n        <li>Plastic Grit (Urea, Melamine, Acrylic)<\/li>\n        <li>Walnut Shell, Corn Cob (sub-angular)<\/li>\n        <li>Coal Slag, Copper Slag<\/li>\n      <\/ul>\n    <\/div>\n    <div class=\"hlh-col-card\">\n      <h4>Spherical (Round) Media<\/h4>\n      <ul>\n        <li>Steel Shot (all SAE grades)<\/li>\n        <li>Glass Beads (all mesh sizes)<\/li>\n        <li>Stainless Steel Shot<\/li>\n        <li>Ceramic Shot (Zirconia)<\/li>\n        <li>Plastic Pellets (round grade)<\/li>\n        <li>Zinc Shot<\/li>\n        <li>Aluminium-Schuss<\/li>\n      <\/ul>\n    <\/div>\n  <\/div>\n\n  <h2 id=\"decision-guide\">Decision Guide: Angular or Round?<\/h2>\n  <div class=\"hlh-table-wrap\">\n    <table>\n      <thead>\n        <tr><th>Ziel<\/th><th>Shape Required<\/th><th>Recommended Media<\/th><\/tr>\n      <\/thead>\n      <tbody>\n        <tr><td>Coating adhesion preparation (Sa 2.5)<\/td><td class=\"td-good\">Eckig<\/td><td>Steel Grit, Aluminum Oxide, Garnet<\/td><\/tr>\n        <tr><td>Thermal spray bond coat preparation<\/td><td class=\"td-good\">Eckig<\/td><td>Aluminum Oxide F46\u2013F60<\/td><\/tr>\n        <tr><td>Heavy rust\/scale removal<\/td><td class=\"td-good\">Eckig<\/td><td>Steel Grit GH, Coarse Al\u2082O\u2083<\/td><\/tr>\n        <tr><td>Shot peening for fatigue life<\/td><td class=\"td-good\">Spherical<\/td><td>Steel Shot (SAE spec), Glass Bead (AMS 2431)<\/td><\/tr>\n        <tr><td>Decorative satin finish (stainless, aluminum)<\/td><td class=\"td-good\">Spherical<\/td><td>Glass Bead US 100\u2013170 mesh<\/td><\/tr>\n        <tr><td>Compressive stress without profiling<\/td><td class=\"td-good\">Spherical<\/td><td>Steel Shot or Glass Bead<\/td><\/tr>\n        <tr><td>High-volume structural steel (anchored coating)<\/td><td>Angular dominant blend<\/td><td>Steel Grit + Steel Shot blend (70:30)<\/td><\/tr>\n        <tr><td>Cleaning without surface change<\/td><td>Soft angular or spherical<\/td><td>Plastic Grit, Walnut Shell, Fine Glass Bead<\/td><\/tr>\n      <\/tbody>\n    <\/table>\n  <\/div>\n\n  <div class=\"hlh-cta\">\n    <h3>Not Sure Whether Angular or Round Is Right for Your Application?<\/h3>\n    <p>Jiangsu Henglihong Technology supplies both angular media (aluminum oxide, silicon carbide, steel grit) and spherical media (glass beads, steel shot) across a full range of sizes and grades. Our technical team can help you determine the right shape class, media type, and grit\/size specification for your specific surface requirement.<\/p>\n    <a href=\"https:\/\/hlh-js.com\/contact\/\" target=\"_blank\" rel=\"noopener\">Get Technical Advice<\/a>\n  <\/div>\n\n  <hr>\n\n  <h2 id=\"faq\">H\u00e4ufig gestellte Fragen<\/h2>\n  <div class=\"hlh-faq\">\n    <div class=\"hlh-faq-item\">\n      <button class=\"hlh-faq-q\" onclick=\"hlhB3Toggle(this)\">What is the difference between angular and round blasting media?<span class=\"hlh-faq-arrow\">\u25bc<\/span><\/button>\n      <div class=\"hlh-faq-a\">Angular media cuts into the surface, creating peaks and valleys (the anchor profile needed for coating adhesion). Round media compresses the surface without cutting, creating smooth dimples and compressive residual stress (the peening effect that improves fatigue life). Angular media removes material; round media does not. The choice between them is determined by whether the goal is coating adhesion (angular) or peening\/decorative finish (round).<\/div>\n    <\/div>\n    <div class=\"hlh-faq-item\">\n      <button class=\"hlh-faq-q\" onclick=\"hlhB3Toggle(this)\">Does angular or round media remove more material?<span class=\"hlh-faq-arrow\">\u25bc<\/span><\/button>\n      <div class=\"hlh-faq-a\">Angular media removes significantly more material \u2014 it shears and displaces substrate material with each cutting impact. Round media removes essentially no measurable material \u2014 it compresses the surface plastically without material loss. For applications where dimensional integrity must be maintained (precision parts, thin walls, critical surfaces), spherical media is preferred for this reason.<\/div>\n    <\/div>\n    <div class=\"hlh-faq-item\">\n      <button class=\"hlh-faq-q\" onclick=\"hlhB3Toggle(this)\">Which blasting media gives the best coating adhesion?<span class=\"hlh-faq-arrow\">\u25bc<\/span><\/button>\n      <div class=\"hlh-faq-a\">Angular media is required for coating adhesion preparation. It creates the anchor profile (Rz 40\u201375 \u00b5m for most industrial coatings at Sa 2.5 cleanliness) that coatings mechanically interlock with. Steel grit, aluminum oxide, and garnet are the most widely used options. Spherical media cannot create adequate anchor profiles and should not be used as the sole media for coating adhesion preparation.<\/div>\n    <\/div>\n  <\/div>\n\n  <hr>\n\n  <div class=\"hlh-related\">\n    <div class=\"hlh-related-title\">Related Guides in This Series<\/div>\n    <div class=\"hlh-related-grid\">\n      <a class=\"hlh-related-card\" href=\"https:\/\/hlh-js.com\/resource\/blog\/abrasive-blasting-media-complete-guide-to-types-properties-selection\/\" target=\"_blank\" rel=\"noopener\">\n        <div class=\"rc-label\">Complete Guide<\/div>\n        <div class=\"rc-title\">Abrasive Blasting Media: Complete Guide to Types, Properties &amp; Selection<\/div>\n      <\/a>\n      <a class=\"hlh-related-card\" href=\"https:\/\/hlh-js.com\/resource\/blog\/steel-shot-steel-grit-blasting-media-angular-vs-round-for-surface-prep\/\" target=\"_blank\" rel=\"noopener\">\n        <div class=\"rc-label\">Media Types<\/div>\n        <div class=\"rc-title\">Steel Shot &amp; Steel Grit: Angular vs Round for Surface Prep<\/div>\n      <\/a>\n      <a class=\"hlh-related-card\" href=\"https:\/\/hlh-js.com\/resource\/blog\/glass-bead-blasting-media-finish-quality-mesh-sizes-equipment-compatibility\/\" target=\"_blank\" rel=\"noopener\">\n        <div class=\"rc-label\">Media Types<\/div>\n        <div class=\"rc-title\">Glass Bead Blasting Media: Finish Quality, Mesh Sizes &amp; Equipment Compatibility<\/div>\n      <\/a>\n      <a class=\"hlh-related-card\" href=\"https:\/\/hlh-js.com\/resource\/blog\/abrasive-blasting-media-comparison-chart-hardness-profile-cost\/\" target=\"_blank\" rel=\"noopener\">\n        <div class=\"rc-label\">Selection Guide<\/div>\n        <div class=\"rc-title\">Abrasive Blasting Media Comparison Chart: Hardness, Profile &amp; Cost<\/div>\n      <\/a>\n    <\/div>\n  <\/div>\n\n<\/div>\n\n<script>\n(function(){\n  function hlhB3Toggle(btn){\n    var item=btn.closest('.hlh-faq-item');\n    var isOpen=item.classList.contains('open');\n    document.querySelectorAll('.hlh-b3 .hlh-faq-item').forEach(function(el){el.classList.remove('open');});\n    if(!isOpen){item.classList.add('open');}\n  }\n  window.hlhB3Toggle=hlhB3Toggle;\n})();\n<\/script>","protected":false},"excerpt":{"rendered":"<p>Selection Guide Angular vs Round Blasting Media: Surface Profile &amp;  [&#8230;]<\/p>","protected":false},"author":1,"featured_media":12769,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[62,175,138],"tags":[],"class_list":["post-12709","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\/12709","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=12709"}],"version-history":[{"count":2,"href":"https:\/\/hlh-js.com\/de\/wp-json\/wp\/v2\/posts\/12709\/revisions"}],"predecessor-version":[{"id":12711,"href":"https:\/\/hlh-js.com\/de\/wp-json\/wp\/v2\/posts\/12709\/revisions\/12711"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hlh-js.com\/de\/wp-json\/wp\/v2\/media\/12769"}],"wp:attachment":[{"href":"https:\/\/hlh-js.com\/de\/wp-json\/wp\/v2\/media?parent=12709"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hlh-js.com\/de\/wp-json\/wp\/v2\/categories?post=12709"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hlh-js.com\/de\/wp-json\/wp\/v2\/tags?post=12709"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}