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HSChapter 28
U.S. imports of inorganic oxygen compounds of nonmetals (nesoi) (HS 281129) totaled $4.0M in April 2026, traded with 22 countries.
Importers of Inorganic Oxygen Compounds of Nonmetals (NESOI) paid $576K in duties in April 2026 — an effective duty rate of 21% on $2.8M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: April 2026 dataA residual catch-all heading for nonmetal oxides not classified elsewhere, this group spans chemically and commercially diverse substances: arsenic trioxide (2811291000), selenium dioxide (2811292000), sulfur dioxide (2811293000), and other compounds (2811295000 and 2811299000), each with distinct industrial end-uses ranging from glass manufacturing to pharmaceutical synthesis. Austria leads US imports under this heading, followed by China and Canada — a supplier mix that reflects specialty chemical production in Europe alongside high-volume Chinese output. Correct subheading selection depends on precise chemical identity, making supplier certificates of analysis essential documentation at entry.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
Arsenic trioxide (2811291000) is a toxic substance and may be subject to EPA Toxic Substances Control Act (TSCA) reporting requirements, as well as hazardous materials transport regulations. Importers should confirm TSCA compliance and consult a licensed customs broker familiar with chemical import requirements before shipment.
A supplier-issued certificate of analysis identifying the precise chemical compound (CAS number, molecular formula, and purity) is the primary classification evidence. Without it, CBP may challenge the declared subheading, particularly when distinguishing between the specific named compounds and the broader NESOI lines.
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 |
|---|---|---|---|---|
| 2811295000 | OTHER INORGANIC OXYGEN COMPOUNDS OF NONMETALS | $3.6M | 20.50% | $529K |
| 2811293000 | SULFUR DIOXIDE | $165K | 14.27% | $8K |
| 2811291000 | ARSENIC TRIOXIDE | $165K | 25.00% | $39K |
| 2811292000 | SELENIUM DIOXIDE | $0 | -- | -- |
OTHER INORGANIC OXYGEN COMPOUNDS OF NONMETALS
SULFUR DIOXIDE
ARSENIC TRIOXIDE
SELENIUM DIOXIDE
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2811299000 | INORGANIC OXYGEN COMPOUNDS OF NONMETALS, NESOI | $2.8M |
| 2811293000 | SULFUR DIOXIDE | $70K |
INORGANIC OXYGEN COMPOUNDS OF NONMETALS, NESOI
1.2M kg
SULFUR DIOXIDE
13.0K 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 |
|---|---|---|---|
| Texas | $556K | $1.4M | +$850K |
| New Jersey | $993K | $10K | -$984K |
| California | $449K | $327K | -$121K |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| OAKLAND, CA | $42K | $956K | +$914K |
| NEWARK, NJ | $934K | $11K | -$922K |
| MIAMI, FL | $600K | $112K | -$488K |