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HSChapter 28
U.S. exports of silicon dioxide (HS 281122) totaled $28.4M in July 2026.
Importers of Silicon Dioxide paid $4.2M in duties in July 2026 — an effective duty rate of 21% on $20.2M in dutiable value, based on actual customs collections rather than the published tariff schedule. Silicon Dioxide imports of $22.4M in July 2026 ran 15% below the year-to-date monthly average of $26.4M.
Last updated: July 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.
838 shipments/mo
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.
Subheading 1 of 6 in heading 2811
Subheading 281122 · $22.4M of $47.2M
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ImportsExports
Imports
$22.4MYoY · Pro
Exports
$28.4MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 2811221000 | Synthetic Silica Gel | $11.6M | 26.24% | 86.94% | $3.0M |
| 2811225000 | Silicon Dioxide, NESOI | $10.8M | 10.86% | 93.44% | $1.2M |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2811220000 | Silicon Dioxide | $28.4M |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
Exports · July 2026
destination
Mexico and Canada together take 67% of it.
customs district
origin
entry
rate provision · imports
10.1% enters free of duty; the effective duty rate is 18.82%.