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SITCSection 5
U.S. imports of silicon dioxide (SITC 52237) 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 dataSilicon dioxide (SiO₂) — traded in forms ranging from fumed silica and precipitated silica to diatomaceous earth and quartz — serves as a functional filler, anti-caking agent, and reinforcing agent across rubber, coatings, food, and pharmaceutical applications. The physical form and surface treatment of SiO₂ are the primary specification variables: fumed silica commands a significant price premium over precipitated grades due to its high surface area and purity, and the two are not interchangeable in most formulations. Food-grade and pharmaceutical-grade silicon dioxide used as an excipient or anti-caking agent is subject to FDA review, while industrial grades require EPA TSCA certification. Crystalline versus amorphous form is also a critical distinction, as crystalline silica carries occupational health exposure obligations under OSHA standards.
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Food-grade silicon dioxide must be accompanied by documentation confirming it meets FDA specifications (21 CFR) for use as a food additive or dietary supplement ingredient, including purity and heavy-metal limits. Industrial-grade material requires EPA TSCA certification but not FDA review. Importers should ensure the commercial invoice and certificate of analysis clearly state the intended grade and end use to avoid admissibility delays.
Crystalline silica (e.g., quartz, cristobalite) is classified as a known human carcinogen by IARC and triggers OSHA Permissible Exposure Limit (PEL) obligations for downstream handlers, while amorphous silica (fumed or precipitated) does not carry the same regulatory burden. Buyers in the rubber and coatings industries specifically source amorphous grades to avoid these workplace safety compliance requirements.
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Monthly import values over time