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SITCSection 5
U.S. imports of artificial corundum (SITC 52267) totaled $7.4M in April 2026, traded with 22 countries.
Importers of Artificial Corundum paid $137K in duties in April 2026 — an effective duty rate of 2.3% on $6.1M in dutiable value, based on actual customs collections rather than the published tariff schedule. Artificial Corundum imports of $7.4M in April 2026 ran 26% below the year-to-date monthly average of $10.1M.
Last updated: April 2026 dataFused aluminum oxide produced by electric-arc smelting — commercially known as artificial corundum or synthetic corundum — is the dominant abrasive grain used in grinding wheels, coated abrasives, and refractory linings. The heading covers both chemically defined and undefined forms, with color and purity (white, brown, pink, and ruby grades) determining hardness and friability for specific abrasive applications. Trade in artificial corundum has drawn Section 301 scrutiny given the concentration of fused-alumina production capacity in China, making origin documentation and country-of-origin marking a compliance priority for importers.
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Brown fused alumina contains a small percentage of titanium oxide, giving it toughness suited for heavy stock removal on steel. White fused alumina is purer and more friable, preferred for precision grinding of hardened steels and ceramics. Pink and ruby grades incorporate chromium oxide for intermediate hardness and are used in tool-room grinding. Each grade may be priced and sourced differently, so specifying the grade on import documents aids accurate classification.
Yes. Artificial corundum originating in China has been subject to Section 301 tariffs, and importers should verify the current tariff list status and applicable exclusions before filing entry. Accurate country-of-origin documentation is essential, particularly when the material passes through a third country before reaching the US.
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Monthly import values over time