{"id":13383,"date":"2026-06-15T05:03:37","date_gmt":"2026-06-15T05:03:37","guid":{"rendered":"https:\/\/hlh-js.com\/?p=13383"},"modified":"2026-06-15T05:03:37","modified_gmt":"2026-06-15T05:03:37","slug":"silicon-carbide-hardness-why-mohs-9-5-makes-it-the-hardest-blasting-media","status":"publish","type":"post","link":"https:\/\/hlh-js.com\/zh\/resource\/blog\/silicon-carbide-hardness-why-mohs-9-5-makes-it-the-hardest-blasting-media\/","title":{"rendered":"Silicon Carbide Hardness: Why\u00a0Mohs 9.5\u00a0Makes It the Hardest Blasting Media"},"content":{"rendered":"<style>\n\/* \u2500\u2500 HLH Cluster Shared CSS \u2500\u2500 *\/\n.hlh-cluster *,.hlh-cluster *::before,.hlh-cluster *::after{box-sizing:border-box;margin:0;padding:0}\n.hlh-cluster{\n  --c-bg:#0d1117;--c-surface:#161b22;--c-panel:#1c2330;--c-border:#2a3444;\n  --c-accent:#e8700a;--c-accent2:#f0920d;--c-steel:#8fa3bc;--c-text:#d4dbe5;\n  --c-heading:#eef2f7;--c-muted:#5a6a7e;--c-tag-bg:#1f2d3d;--c-tag-text:#7eb8e8;\n  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Checklist *\/\n.hlh-checklist{list-style:none;margin:14px 0}\n.hlh-checklist li{display:flex;gap:10px;align-items:flex-start;padding:8px 0;border-bottom:1px solid var(--c-border);font-size:14.5px;color:var(--c-steel);line-height:1.55}\n.hlh-checklist li:last-child{border-bottom:none}\n.hlh-checklist li::before{content:'\u2713';color:#4caf74;flex-shrink:0;font-weight:700;margin-top:1px}\n.hlh-warn-list{list-style:none;margin:14px 0}\n.hlh-warn-list li{display:flex;gap:10px;align-items:flex-start;padding:8px 0;border-bottom:1px solid var(--c-border);font-size:14.5px;color:var(--c-steel);line-height:1.55}\n.hlh-warn-list li:last-child{border-bottom:none}\n.hlh-warn-list li::before{content:'\u2717';color:#f07080;flex-shrink:0;font-weight:700;margin-top:1px}\n\/* Responsive *\/\n@media(max-width:900px){.hlh-layout{grid-template-columns:1fr;padding:0 4%}.hlh-toc-wrap{position:static;padding:20px 0 0}.hlh-article{padding:20px 0}.hlh-vs-wrap{grid-template-columns:1fr}.hlh-vs-divider{display:none}}\n@media(max-width:600px){.hlh-hero{padding:44px 5% 36px}.hlh-related-grid{grid-template-columns:1fr}.hlh-cta-section{padding:32px 20px}}\n\n<\/style>\n\n<div class=\"hlh-cluster\">\n\n<div class=\"hlh-hero\">\n  <div class=\"hlh-hero-eyebrow\">Technical Reference \u00b7 Jiangsu Henglihong Technology Co., Ltd.<\/div>\n  <h1>Silicon Carbide Hardness: Why <em>Mohs 9.5<\/em> Makes It the Hardest Blasting Media<\/h1>\n  <p class=\"hlh-hero-sub\">A deep-dive into SiC hardness \u2014 what Mohs 9.5 means in practice, how it compares to every major blasting abrasive, and how hardness translates directly into cutting speed, surface profile, and cost-per-hour savings.<\/p>\n  <div class=\"hlh-hero-meta\">\n    <div class=\"hlh-meta-item\">\ud83d\udcc5 <span>Updated June 2026<\/span><\/div>\n    <div class=\"hlh-meta-dot\"><\/div>\n    <div class=\"hlh-meta-item\">\u23f1\ufe0f <span>~9 min read<\/span><\/div>\n    <div class=\"hlh-meta-dot\"><\/div>\n    <div class=\"hlh-meta-item\">\ud83c\udfed <span>Henglihong Technical Team<\/span><\/div>\n  <\/div>\n<\/div>\n\n<div class=\"hlh-layout\">\n<aside class=\"hlh-toc-wrap\">\n  <nav class=\"hlh-toc\" aria-label=\"Table of Contents\">\n    <div class=\"hlh-toc-title\">Contents<\/div>\n    <ol>\n      <li><a href=\"#mohs-explained\">The Mohs Scale Explained<\/a><\/li>\n      <li><a href=\"#sic-position\">SiC&#8217;s Position at Mohs 9.5<\/a><\/li>\n      <li><a href=\"#hardness-comparison\">Hardness vs. All Blast Media<\/a><\/li>\n      <li><a href=\"#hardness-cutting\">Hardness \u2192 Cutting Speed<\/a><\/li>\n      <li><a href=\"#hardness-profile\">Hardness \u2192 Surface Profile<\/a><\/li>\n      <li><a href=\"#hardness-cost\">Hardness \u2192 Cost per Hour<\/a><\/li>\n      <li><a href=\"#equipment-wear\">Equipment Wear Implications<\/a><\/li>\n      <li><a href=\"#limits\">When Hardness Works Against You<\/a><\/li>\n      <li><a href=\"#faq\">FAQ<\/a><\/li>\n      <li><a href=\"#related\">Related Guides<\/a><\/li>\n    <\/ol>\n    <a class=\"hlh-toc-cta\" href=\"https:\/\/hlh-js.com\/contact\/\" target=\"_blank\" rel=\"noopener\">Request a Quote \u2192<\/a>\n  <\/nav>\n<\/aside>\n\n<article class=\"hlh-article\">\n\n<div class=\"hlh-section\">\n  <span class=\"hlh-section-anchor\" id=\"mohs-explained\"><\/span>\n  <h2><span class=\"hlh-h2-num\">SECTION 01<\/span>The Mohs Hardness Scale Explained<\/h2>\n  <p>The Mohs hardness scale, developed by German mineralogist Friedrich Mohs in 1812, ranks minerals from 1 (softest \u2014 talc) to 10 (hardest \u2014 diamond) based on scratch resistance. The scale is ordinal, not linear: a mineral with a higher Mohs number can scratch any mineral with a lower number, and the intervals between numbers are not equal in terms of absolute hardness. The jump from Mohs 9 to Mohs 10 (corundum to diamond) represents an increase in absolute hardness of approximately 4\u00d7 \u2014 far larger than the jump from Mohs 8 to Mohs 9.<\/p>\n  <p>In abrasive blasting, Mohs hardness is the single most predictive indicator of how effectively a media will cut through a given substrate. The fundamental rule: <strong>an abrasive must be harder than the substrate it is blasting<\/strong> to achieve efficient material removal. The greater the hardness differential, the more aggressive and efficient the cutting action.<\/p>\n  <div class=\"hlh-highlight\">\n    <p><strong>Mohs scale reference points:<\/strong> Talc (1) \u2192 Gypsum (2) \u2192 Calcite (3) \u2192 Fluorite (4) \u2192 Apatite (5) \u2192 Feldspar (6) \u2192 Quartz (7) \u2192 Topaz (8) \u2192 Corundum\/Al\u2082O\u2083 (9) \u2192 <strong>Silicon Carbide (9.5)<\/strong> \u2192 Diamond (10)<\/p>\n  <\/div>\n<\/div>\n\n<hr class=\"hlh-divider\">\n\n<div class=\"hlh-section\">\n  <span class=\"hlh-section-anchor\" id=\"sic-position\"><\/span>\n  <h2><span class=\"hlh-h2-num\">SECTION 02<\/span>Silicon Carbide&#8217;s Position at Mohs 9.5<\/h2>\n  <p>Silicon carbide sits at Mohs 9.0\u20139.5 on the hardness scale \u2014 harder than every commercially available natural mineral and every synthetic abrasive commonly used in industrial blasting except diamond (which is prohibitively expensive for blasting applications and cubic boron nitride, which is used only in grinding). This position at the top of the practical abrasive hardness range is not an accident of chemistry \u2014 it is a consequence of SiC&#8217;s strong covalent bonding structure.<\/p>\n  <p>In crystalline SiC, each silicon atom is covalently bonded to four carbon atoms in a tetrahedral arrangement, and each carbon atom is bonded to four silicon atoms. This three-dimensional network of strong, directional covalent bonds \u2014 with a bond energy of approximately 318 kJ\/mol \u2014 creates extraordinary resistance to plastic deformation, cleavage, and surface penetration. The result is a material that resists being scratched by virtually any other industrial material, while itself being capable of scratching and cutting everything below it on the hardness scale.<\/p>\n  <p>For a comprehensive overview of silicon carbide as a blasting media \u2014 beyond hardness alone \u2014 see: <a href=\"https:\/\/hlh-js.com\/resource\/blog\/silicon-carbide-abrasive-blasting-media-complete-buyers-guide\/\" target=\"_blank\" rel=\"noopener\">Complete Buyer&#8217;s Guide to SiC Abrasive Blasting Media<\/a>.<\/p>\n<\/div>\n\n<hr class=\"hlh-divider\">\n\n<div class=\"hlh-section\">\n  <span class=\"hlh-section-anchor\" id=\"hardness-comparison\"><\/span>\n  <h2><span class=\"hlh-h2-num\">SECTION 03<\/span>Hardness Comparison: SiC vs. All Major Blast Media<\/h2>\n  <div class=\"hlh-table-wrap\">\n    <table class=\"hlh-table\">\n      <thead>\n        <tr><th>\u55b7\u7802\u4ecb\u8d28<\/th><th>\u83ab\u6c0f\u786c\u5ea6<\/th><th>\u7c7b\u578b<\/th><th>Max Substrate Hardness<\/th><th>Relative Cost<\/th><\/tr>\n      <\/thead>\n      <tbody>\n        <tr><td><strong>Silicon Carbide (SiC)<\/strong><\/td><td><span class=\"hlh-badge hlh-badge-green\">9.0 \u2013 9.5<\/span><\/td><td>Synthetic mineral<\/td><td>Hardened steel, ceramics, stone<\/td><td>$$<\/td><\/tr>\n        <tr><td><strong>Aluminum Oxide (Al\u2082O\u2083)<\/strong><\/td><td>8.0 \u2013 9.0<\/td><td>Synthetic mineral<\/td><td>Most metals, painted surfaces<\/td><td>$<\/td><\/tr>\n        <tr><td><strong>Steel Grit \/ Shot<\/strong><\/td><td>7.0 \u2013 8.0<\/td><td>Metallic<\/td><td>Carbon steel, alloy steel<\/td><td>$ (high recycle)<\/td><\/tr>\n        <tr><td><strong>\u77f3\u69b4\u77f3<\/strong><\/td><td>6.5 \u2013 7.5<\/td><td>Natural mineral<\/td><td>Soft to medium metals, wood<\/td><td>$<\/td><\/tr>\n        <tr><td><strong>Crushed Glass<\/strong><\/td><td>5.5 \u2013 6.5<\/td><td>Recycled mineral<\/td><td>Soft metals, light rust<\/td><td>$<\/td><\/tr>\n        <tr><td><strong>Glass Bead<\/strong><\/td><td>5.5 \u2013 6.5<\/td><td>Synthetic glass<\/td><td>Soft metals (peening \/ finish)<\/td><td>$<\/td><\/tr>\n        <tr><td><strong>Olivine \/ Slag<\/strong><\/td><td>6.0 \u2013 7.0<\/td><td>Natural \/ industrial<\/td><td>Soft to medium metals<\/td><td>$ (low)<\/td><\/tr>\n        <tr><td><strong>Plastic Bead<\/strong><\/td><td>3.0 \u2013 4.0<\/td><td>Synthetic polymer<\/td><td>Soft coatings, composites<\/td><td>$$<\/td><\/tr>\n        <tr><td><strong>Walnut Shell<\/strong><\/td><td>3.0 \u2013 4.0<\/td><td>Organic<\/td><td>Paint on soft substrates<\/td><td>$<\/td><\/tr>\n        <tr><td><strong>\u78b3\u9178\u6c22\u94a0<\/strong><\/td><td>2.5<\/td><td>Mineral<\/td><td>Sensitive surfaces, food equipment<\/td><td>$$<\/td><\/tr>\n      <\/tbody>\n    <\/table>\n  <\/div>\n  <p>The data is unambiguous: silicon carbide is the hardest blasting abrasive available at industrial production scale. The next hardest common alternative \u2014 aluminum oxide \u2014 is 0.5 to 1.5 Mohs units softer, which translates to a 40\u201360% reduction in scratch resistance in absolute terms. For context, this hardness advantage is why SiC can efficiently blast hardened tool steel, silicon carbide ceramics, sapphire, and other substrates that would leave aluminum oxide worn and ineffective within minutes of operation.<\/p>\n<\/div>\n\n<hr class=\"hlh-divider\">\n\n<div class=\"hlh-section\">\n  <span class=\"hlh-section-anchor\" id=\"hardness-cutting\"><\/span>\n  <h2><span class=\"hlh-h2-num\">SECTION 04<\/span>How Hardness Translates to Cutting Speed<\/h2>\n  <p>In abrasive blasting, cutting speed (the rate of material removal per unit area per unit time) is a function of several variables: particle impact velocity, particle mass, particle shape, and \u2014 critically \u2014 the hardness differential between media and substrate. Silicon carbide&#8217;s Mohs 9.5 hardness creates a large positive hardness differential against virtually every industrial substrate, allowing individual SiC particles to penetrate the substrate surface deeply on each impact rather than deflecting or fracturing prematurely.<\/p>\n  <p>In controlled blasting trials on carbon steel (Mohs ~7.5) under identical pressure, nozzle, and flow conditions, silicon carbide consistently achieves 2\u20133\u00d7 the material removal rate of aluminum oxide, and 3\u20134\u00d7 the removal rate of garnet. This speed advantage has direct economic implications: on a project requiring 500 m\u00b2 of Sa 2.5 surface preparation, substituting SiC for garnet can reduce blasting time from 16 hours to 4\u20135 hours \u2014 saving over 10 operator-hours of labor per shift.<\/p>\n  <div class=\"hlh-highlight\">\n    <p><strong>Relative cutting speed index (carbon steel, direct pressure, equal grit size):<\/strong><br>\n    Silicon Carbide: <strong>100%<\/strong> (reference) | Aluminum Oxide: 45\u201355% | Steel Grit: 40\u201350% | Garnet: 30\u201340% | Glass Bead: 15\u201320%<\/p>\n  <\/div>\n  <p>It is important to note that cutting speed is not the only relevant performance metric. For applications requiring controlled surface profiles, specific Ra values, or preservation of substrate dimensional tolerances, a slower-cutting media may be specified to achieve finer surface finish. See the <a href=\"https:\/\/hlh-js.com\/resource\/blog\/silicon-carbide-grit-size-chart-how-to-choose-the-right-mesh-for-blasting\/\" target=\"_blank\" rel=\"noopener\">SiC Grit Size &#038; Surface Profile Guide<\/a> for profile depth selection.<\/p>\n<\/div>\n\n<hr class=\"hlh-divider\">\n\n<div class=\"hlh-section\">\n  <span class=\"hlh-section-anchor\" id=\"hardness-profile\"><\/span>\n  <h2><span class=\"hlh-h2-num\">SECTION 05<\/span>Hardness and Surface Profile Depth<\/h2>\n  <p>Silicon carbide&#8217;s hardness \u2014 combined with its angular particle morphology \u2014 produces some of the deepest surface anchor profiles of any abrasive at equivalent grit size. This is because harder particles penetrate the substrate surface further before being deflected or fracturing, creating more pronounced peaks and valleys in the surface topography.<\/p>\n  <div class=\"hlh-table-wrap\">\n    <table class=\"hlh-table\">\n      <thead>\n        <tr><th>Media<\/th><th>\u83ab\u6c0f\u786c\u5ea6<\/th><th>Typical Ra on Steel (\u00b5m)<\/th><th>Typical Rz on Steel (\u00b5m)<\/th><th>Coating Adhesion Profile<\/th><\/tr>\n      <\/thead>\n      <tbody>\n        <tr><td><strong>SiC #60<\/strong><\/td><td>9.5<\/td><td>8\u201314<\/td><td>45\u201380<\/td><td><span class=\"hlh-badge hlh-badge-green\">Excellent<\/span><\/td><\/tr>\n        <tr><td><strong>Al\u2082O\u2083 #60<\/strong><\/td><td>9.0<\/td><td>5\u20139<\/td><td>28\u201352<\/td><td><span class=\"hlh-badge hlh-badge-green\">Very Good<\/span><\/td><\/tr>\n        <tr><td><strong>Garnet #60<\/strong><\/td><td>7.0<\/td><td>3\u20136<\/td><td>18\u201335<\/td><td><span class=\"hlh-badge hlh-badge-orange\">Good<\/span><\/td><\/tr>\n        <tr><td><strong>Steel Grit G25<\/strong><\/td><td>7.5<\/td><td>4\u20138<\/td><td>22\u201344<\/td><td><span class=\"hlh-badge hlh-badge-green\">Very Good<\/span><\/td><\/tr>\n        <tr><td><strong>Glass Bead #60<\/strong><\/td><td>6.0<\/td><td>0.5\u20131.5<\/td><td>3\u20139<\/td><td><span class=\"hlh-badge hlh-badge-red\">Limited<\/span><\/td><\/tr>\n      <\/tbody>\n    <\/table>\n  <\/div>\n  <p>The deeper profiles created by SiC are particularly valuable for high-build coating systems (epoxy, polyurethane, zinc-rich primers) that require maximum mechanical adhesion. However, the same aggressive profile can be problematic for thin-film applications or substrates with tight dimensional tolerances. Always verify target Ra or Rz values with your coating manufacturer before specifying SiC grit size.<\/p>\n<\/div>\n\n<hr class=\"hlh-divider\">\n\n<div class=\"hlh-section\">\n  <span class=\"hlh-section-anchor\" id=\"hardness-cost\"><\/span>\n  <h2><span class=\"hlh-h2-num\">SECTION 06<\/span>Hardness and Cost-per-Hour Economics<\/h2>\n  <p>A common procurement error is evaluating abrasive blasting media on media cost per ton alone without accounting for how hardness affects total operational cost. Silicon carbide&#8217;s higher unit price per ton is frequently offset \u2014 and often overcompensated \u2014 by its superior cutting speed when blasting hard substrates.<\/p>\n  <p>Consider a simplified example: a contractor needs to blast-clean 200 m\u00b2 of structural steel to Sa 2.5 cleanliness. Using garnet at $X per ton achieves a production rate of 4 m\u00b2\/hour. Using SiC at $2X per ton achieves 11 m\u00b2\/hour. The garnet job requires 50 operator-hours; the SiC job requires 18 operator-hours. At $65\/hour labor rate, garnet costs $3,250 in labor; SiC costs $1,170 \u2014 a $2,080 labor saving that more than offsets any media price premium. For a full economic analysis, see: <a class=\"hlh-link-pill\" href=\"https:\/\/hlh-js.com\/resource\/blog\/is-silicon-carbide-blasting-media-recyclable-reuse-cycles-cost-analysis\/\" target=\"_blank\" rel=\"noopener\">SiC Cost Analysis &#038; Recyclability<\/a><\/p>\n<\/div>\n\n<hr class=\"hlh-divider\">\n\n<div class=\"hlh-section\">\n  <span class=\"hlh-section-anchor\" id=\"equipment-wear\"><\/span>\n  <h2><span class=\"hlh-h2-num\">SECTION 07<\/span>Equipment Wear Implications of High Hardness<\/h2>\n  <p>Silicon carbide&#8217;s extreme hardness is a double-edged property: it cuts substrates efficiently, but it also aggressively wears blasting equipment that is not rated for hard abrasive service. Operators switching from softer media (glass bead, garnet) to SiC without upgrading equipment components will experience dramatically accelerated nozzle, hose, and valve wear.<\/p>\n  <div class=\"hlh-table-wrap\">\n    <table class=\"hlh-table\">\n      <thead><tr><th>\u6210\u5206<\/th><th>Material for SiC Service<\/th><th>Expected Life (SiC)<\/th><th>Avoid Using<\/th><\/tr><\/thead>\n      <tbody>\n        <tr><td><strong>Blast Nozzle<\/strong><\/td><td>Boron carbide (preferred) or tungsten carbide<\/td><td>750\u20131,500 hrs (BC) \/ 300\u2013500 hrs (TC)<\/td><td>Ceramic, hardened steel, cast iron<\/td><\/tr>\n        <tr><td><strong>Blast Hose<\/strong><\/td><td>Heavy-wall rubber, \u2265 12 mm wall thickness<\/td><td>300\u2013600 hrs depending on ID<\/td><td>Lightweight suction hose<\/td><\/tr>\n        <tr><td><strong>Media Valve \/ Metering<\/strong><\/td><td>Tungsten carbide or polyurethane-lined<\/td><td>500\u20131,000 hrs<\/td><td>Standard rubber pinch valves<\/td><\/tr>\n        <tr><td><strong>Blast Pot Liner<\/strong><\/td><td>Rubber-lined or polyurethane<\/td><td>Check annually<\/td><td>Bare steel pot interior<\/td><\/tr>\n        <tr><td><strong>Deadman Handle<\/strong><\/td><td>Standard heavy-duty<\/td><td>Standard service life<\/td><td>N\/A<\/td><\/tr>\n      <\/tbody>\n    <\/table>\n  <\/div>\n  <div class=\"hlh-note\">\n    <span class=\"hlh-note-icon\">\u26a0\ufe0f<\/span>\n    <p><strong>Critical note:<\/strong> Boron carbide (Mohs ~9.5) is the only nozzle material that closely matches SiC&#8217;s hardness and provides the longest nozzle life. Never use standard aluminum oxide or ceramic nozzles with SiC media \u2014 they will fail within hours at operational pressures.<\/p>\n  <\/div>\n<\/div>\n\n<hr class=\"hlh-divider\">\n\n<div class=\"hlh-section\">\n  <span class=\"hlh-section-anchor\" id=\"limits\"><\/span>\n  <h2><span class=\"hlh-h2-num\">SECTION 08<\/span>When SiC Hardness Works Against You<\/h2>\n  <p>There are specific situations where silicon carbide&#8217;s high hardness is a liability rather than an asset:<\/p>\n  <ul class=\"hlh-warn-list\">\n    <li><strong>Soft substrate damage:<\/strong> On aluminum (Mohs ~2.5), copper, brass, or zinc, SiC&#8217;s hardness causes excessive material removal, particle embedding, and surface waviness. Use glass bead or plastic media instead.<\/li>\n    <li><strong>Thin-walled components:<\/strong> The aggressive cutting action can cause dimensional loss on precision components with tight tolerances. Measure substrate thickness and calculate maximum allowable profile depth before specifying SiC.<\/li>\n    <li><strong>Heat-sensitive substrates:<\/strong> While SiC itself is thermally stable, its high-speed cutting generates local heat at the impact point. On temperature-sensitive polymer composites or adhesive-bonded assemblies, this can cause delamination or resin degradation.<\/li>\n    <li><strong>Equipment not rated for hard abrasive:<\/strong> As discussed in Section 07, under-specified equipment will fail rapidly and create safety hazards. Do not use SiC in equipment designed for glass bead, plastic, or soft organic media.<\/li>\n  <\/ul>\n  <p>For a complete guide to scenarios where SiC is the wrong choice and which alternatives to specify instead, see: <a class=\"hlh-link-pill\" href=\"https:\/\/hlh-js.com\/resource\/blog\/when-not-to-use-silicon-carbide-blasting-media-5-situations-to-avoid\/\" target=\"_blank\" rel=\"noopener\">When NOT to Use SiC Blasting Media<\/a><\/p>\n<\/div>\n\n<hr class=\"hlh-divider\">\n\n<div class=\"hlh-section\">\n  <span class=\"hlh-section-anchor\" id=\"faq\"><\/span>\n  <h2><span class=\"hlh-h2-num\">SECTION 09<\/span>FAQ<\/h2>\n  <div style=\"border:1px solid var(--c-border);border-radius:var(--r-md);margin-bottom:10px;overflow:hidden\">\n    <div style=\"background:var(--c-panel);padding:13px 17px;font-size:14px;font-weight:600;color:var(--c-heading)\">Is silicon carbide harder than steel?<\/div>\n    <div style=\"padding:13px 17px;font-size:13.5px;color:var(--c-steel);border-top:1px solid var(--c-border)\">Yes, significantly. Carbon steel rates approximately 7\u20138 on the Mohs scale; hardened tool steel reaches up to 8. Silicon carbide at Mohs 9.5 is substantially harder than all commercial steel grades, which is why it blasts steel surfaces effectively and efficiently. Steel abrasives (shot, grit) rate 7\u20138 Mohs and are not hard enough to blast hardened steels above Mohs 8 effectively.<\/div>\n  <\/div>\n  <div style=\"border:1px solid var(--c-border);border-radius:var(--r-md);margin-bottom:10px;overflow:hidden\">\n    <div style=\"background:var(--c-panel);padding:13px 17px;font-size:14px;font-weight:600;color:var(--c-heading)\">Why is silicon carbide harder than aluminum oxide?<\/div>\n    <div style=\"padding:13px 17px;font-size:13.5px;color:var(--c-steel);border-top:1px solid var(--c-border)\">Both are crystalline ceramics, but SiC&#8217;s tetrahedral Si\u2013C covalent bond (bond energy ~318 kJ\/mol) is stronger than Al\u2082O\u2083&#8217;s mixed ionic-covalent Al\u2013O bond (~512 kJ\/mol per formula unit, but distributed differently in the crystal structure). The result is that SiC resists surface penetration \u2014 the physical measure of hardness \u2014 more effectively than Al\u2082O\u2083, despite aluminum oxide being denser. This 0.5\u20131.5 Mohs unit advantage translates to roughly 30\u201350% greater scratch resistance in absolute terms.<\/div>\n  <\/div>\n  <div style=\"border:1px solid var(--c-border);border-radius:var(--r-md);overflow:hidden\">\n    <div style=\"background:var(--c-panel);padding:13px 17px;font-size:14px;font-weight:600;color:var(--c-heading)\">Does higher Mohs hardness always mean better blasting performance?<\/div>\n    <div style=\"padding:13px 17px;font-size:13.5px;color:var(--c-steel);border-top:1px solid var(--c-border)\">Not always. Hardness must be matched to the substrate. An abrasive that is far harder than the substrate will cause excessive material removal, surface damage, and potential dimensional loss \u2014 especially on soft metals and precision components. The best blasting abrasive is the one with the appropriate hardness differential for the substrate and application, correct grit size for the target surface profile, and the right morphology (angular vs. rounded) for the desired finish.<\/div>\n  <\/div>\n<\/div>\n\n<hr class=\"hlh-divider\">\n\n<div class=\"hlh-section\">\n  <span class=\"hlh-section-anchor\" id=\"related\"><\/span>\n  <h2><span class=\"hlh-h2-num\">SECTION 10<\/span>Related Guides<\/h2>\n  <div class=\"hlh-related-grid\">\n    <a class=\"hlh-related-card\" href=\"https:\/\/hlh-js.com\/resource\/blog\/silicon-carbide-abrasive-blasting-media-complete-buyers-guide\/\" target=\"_blank\" rel=\"noopener\">\n      <span class=\"hlh-related-tag\">Pillar<\/span>\n      <div class=\"hlh-related-title\">Complete Buyer&#8217;s Guide to SiC Blasting Media<\/div>\n      <div class=\"hlh-related-desc\">All properties, applications, grit selection and sourcing in one comprehensive guide.<\/div>\n      <div class=\"hlh-related-arrow\">Read guide \u2192<\/div>\n    <\/a>\n    <a class=\"hlh-related-card\" href=\"https:\/\/hlh-js.com\/resource\/blog\/silicon-carbide-vs-aluminum-oxide-blasting-media-full-comparison-2025\/\" target=\"_blank\" rel=\"noopener\">\n      <span class=\"hlh-related-tag\">Comparison<\/span>\n      <div class=\"hlh-related-title\">SiC vs. Aluminum Oxide: Full 2026 Comparison<\/div>\n      <div class=\"hlh-related-desc\">Head-to-head analysis including hardness, speed, cost, recyclability and best applications.<\/div>\n      <div class=\"hlh-related-arrow\">Read guide \u2192<\/div>\n    <\/a>\n    <a class=\"hlh-related-card\" href=\"https:\/\/hlh-js.com\/resource\/blog\/silicon-carbide-grit-size-chart-how-to-choose-the-right-mesh-for-blasting\/\" target=\"_blank\" rel=\"noopener\">\n      <span class=\"hlh-related-tag\">Selection<\/span>\n      <div class=\"hlh-related-title\">SiC Grit Size Chart &#038; Selection Guide<\/div>\n      <div class=\"hlh-related-desc\">Choose the right mesh size for your surface profile requirement.<\/div>\n      <div class=\"hlh-related-arrow\">Read guide \u2192<\/div>\n    <\/a>\n    <a class=\"hlh-related-card\" href=\"https:\/\/hlh-js.com\/resource\/blog\/when-not-to-use-silicon-carbide-blasting-media-5-situations-to-avoid\/\" target=\"_blank\" rel=\"noopener\">\n      <span class=\"hlh-related-tag\">Limitations<\/span>\n      <div class=\"hlh-related-title\">When NOT to Use SiC Blasting Media<\/div>\n      <div class=\"hlh-related-desc\">5 situations where SiC hardness works against you and what to use instead.<\/div>\n      <div class=\"hlh-related-arrow\">Read guide \u2192<\/div>\n    <\/a>\n  <\/div>\n<\/div>\n\n<div class=\"hlh-cta-section\">\n  <h2>Source Silicon Carbide Blasting Media Direct from Manufacturer<\/h2>\n  <p>Jiangsu Henglihong Technology Co., Ltd. supplies SiC blasting media \u2014 Black and Green grades, Mohs 9.0\u20139.5, full grit range \u2014 with factory-direct pricing and complete QC documentation.<\/p>\n  <a class=\"hlh-cta-btn\" href=\"https:\/\/hlh-js.com\/contact\/\" target=\"_blank\" rel=\"noopener\">Get a Quote \u2192<\/a>\n  <div class=\"hlh-cta-sub\">FEPA \/ ANSI \/ JIS standards \u00b7 Free samples available \u00b7 Lot-level certificates<\/div>\n<\/div>\n\n<div class=\"hlh-author\">\n  <div class=\"hlh-author-avatar\">\u2699\ufe0f<\/div>\n  <div>\n    <div class=\"hlh-author-name\">Henglihong Technical Content Team<\/div>\n    <div class=\"hlh-author-bio\">Published by Jiangsu Henglihong Technology Co., Ltd. Reviewed by production engineers with direct SiC manufacturing expertise. Last updated: June 2026.<\/div>\n  <\/div>\n<\/div>\n\n<\/article>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Technical Reference \u00b7 Jiangsu Henglihong Technology Co., Ltd. Silicon Carbide  [&#8230;]<\/p>","protected":false},"author":1,"featured_media":13385,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[62,177,138],"tags":[],"class_list":["post-13383","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-material","category-resource"],"_links":{"self":[{"href":"https:\/\/hlh-js.com\/zh\/wp-json\/wp\/v2\/posts\/13383","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hlh-js.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hlh-js.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hlh-js.com\/zh\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/hlh-js.com\/zh\/wp-json\/wp\/v2\/comments?post=13383"}],"version-history":[{"count":2,"href":"https:\/\/hlh-js.com\/zh\/wp-json\/wp\/v2\/posts\/13383\/revisions"}],"predecessor-version":[{"id":13386,"href":"https:\/\/hlh-js.com\/zh\/wp-json\/wp\/v2\/posts\/13383\/revisions\/13386"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hlh-js.com\/zh\/wp-json\/wp\/v2\/media\/13385"}],"wp:attachment":[{"href":"https:\/\/hlh-js.com\/zh\/wp-json\/wp\/v2\/media?parent=13383"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hlh-js.com\/zh\/wp-json\/wp\/v2\/categories?post=13383"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hlh-js.com\/zh\/wp-json\/wp\/v2\/tags?post=13383"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}