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HSChapter 28
U.S. imports of artificial corundum (HS 281810) 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 dataArtificial corundum — fused aluminum oxide produced in electric arc furnaces — is the workhorse abrasive grain for grinding wheels, coated abrasives, and refractory linings, with purity and crystal structure determining its grade and price tier. The US tariff schedule distinguishes crude artificial corundum (2818101000) from further-processed forms, and within the latter separates high-purity white, pink, and ruby grades exceeding 97.5% Al₂O₃ (2818102010) from all other processed corundum (2818102090). China is by far the dominant global producer and the leading US import source under this heading, creating notable supply-concentration risk for abrasives manufacturers.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
The threshold is aluminum oxide purity: 2818102010 applies to white, pink, and ruby artificial corundum containing more than 97.5% Al₂O₃. Standard brown fused alumina — produced from bauxite and typically containing 94–97% Al₂O₃ with iron and titanium impurities — falls under 2818102090. The color and purity specification must be documented by the manufacturer's certificate of analysis to support the correct line.
Yes — artificial corundum from China has been subject to antidumping duty orders, and importers should confirm the current scope and cash deposit rates with CBP before importing. Additionally, Section 301 tariffs may apply to Chinese-origin corundum. Given China's dominant share of global supply, these measures materially affect sourcing decisions, and some buyers have shifted to Austrian or Canadian suppliers to manage duty exposure.
Monthly import values over time
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HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 2818102010 | WHITE,PINK,RUBY ARTIF. CORUNDUM, GT 97.5% AL OXIDE | $4.5M | 2.61% | $84K |
| 2818102090 | ARTIFICIAL CORUNDUM, NESOI | $2.8M | 1.74% | $49K |
| 2818101000 | CRUDE ARTIFICIAL CORUNDUM | $147K | 7.26% | $4K |
WHITE,PINK,RUBY ARTIF. CORUNDUM, GT 97.5% AL OXIDE
ARTIFICIAL CORUNDUM, NESOI
CRUDE ARTIFICIAL CORUNDUM
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2818100000 | ARTIFICIAL CORUNDUM | $2.7M |
ARTIFICIAL CORUNDUM
1.1M kg
URANIUM ENRICHED IN U235 ETC. PLUTONIUM ETC.
HS 284420
NATURAL URANIUM & COMPOUNDS, ALLOYS & CERAMICS ETC
HS 284410
ANHYDROUS AMMONIA
HS 281410
ALLOYS, DISPERSIONS,ISOTOPES & COMPOUNDS NES
HS 284443
SILICON, UNDER 99.99% (BY WEIGHT) SILICON
HS 280469
PHOSPHORIC ACID AND POLYPHOSPHORIC ACIDS
HS 280920
| State | Imports | Exports | Balance |
|---|---|---|---|
| New York | $3.0M | $967K | -$2.1M |
| Massachusetts | $690K | $965K | +$275K |
| Texas | $977K | $401K | -$575K |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| BUFFALO-NIAGARA FALLS, NY | $2.9M | $273K | -$2.6M |
| HOUSTON, TX | $932K | $50K | -$882K |
| NEWARK, NJ | $609K | $97K | -$512K |