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HSChapter 28
U.S. imports of silicon dioxide (HS 281122) totaled $24.9M in April 2026, traded with 40 countries.
Importers of Silicon Dioxide paid $4.9M in duties in April 2026 — an effective duty rate of 22% on $22.9M in dutiable value, based on actual customs collections rather than the published tariff schedule. Silicon Dioxide imports of $24.9M in April 2026 ran 10% below the year-to-date monthly average of $27.7M.
Last updated: April 2026 dataSynthetic silica gel (2811221000) and other silicon dioxide forms (2811225000) serve distinct industrial roles — silica gel as a desiccant and chromatography medium, fumed or precipitated silica as a rubber reinforcing agent or food anti-caking agent — making correct subheading selection critical. China is the dominant supplier, with Japan and Germany also significant sources; imports from China are subject to Section 301 tariffs, a cost factor that has driven sourcing diversification toward European and Japanese producers for higher-specification grades. Buyers should verify whether the product is synthetic silica gel or another form before entry, as the two 10-digit lines carry different classification treatment.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
Synthetic silica gel is an amorphous, porous form of SiO₂ manufactured by chemical precipitation and used primarily as a desiccant or adsorbent. Fumed silica, precipitated silica used as a reinforcing filler, and other non-gel forms generally fall under the NESOI line. The supplier's technical data sheet and production method are the key classification evidence.
Yes. Silicon dioxide originating in China is subject to Section 301 tariffs. Importers sourcing from Japan or Germany — the next leading suppliers — should evaluate whether the specification requirements and total landed cost justify the origin shift.
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Monthly import values over time
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 2811221000 | SYNTHETIC SILICA GEL | $13.9M | 29.92% | $3.7M |
| 2811225000 | SILICON DIOXIDE, NESOI | $10.9M | 11.73% | $1.2M |
SYNTHETIC SILICA GEL
SILICON DIOXIDE, NESOI
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2811220000 | SILICON DIOXIDE | $19.6M |
SILICON DIOXIDE
7.6M 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 |
|---|---|---|---|
| California | $7.0M | $230K | -$6.7M |
| New Jersey | $682K | $6.4M | +$5.7M |
| Maryland | $1.8M | $2.5M | +$630K |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| LAREDO, TX | $207K | $6.3M | +$6.1M |
| LOS ANGELES, CA | $5.3M | -- | -$5.3M |
| SAVANNAH, GA | $2.5M | $894K | -$1.6M |