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SITCSection 6
U.S. exports of ceramic goods of siliceous fossil meals or similar siliceous earths (SITC 66231) totaled $471K in July 2026.
Importers of Ceramic Goods of Siliceous Fossil Meals or Similar Siliceous Earths paid $40K in duties in July 2026 — an effective duty rate of 14% on $281K in dutiable value, based on actual customs collections rather than the published tariff schedule.
Basic heading 66231 · $281K of $26.7B
Bricks, blocks, tiles, and other ceramic articles manufactured from diatomite (diatomaceous earth), kieselguhr, tripolite, or similar siliceous fossil meals are classified here — a specialized refractory and filtration-industry heading distinct from conventional clay-based ceramics. These high-porosity, low-density ceramic goods are prized for thermal insulation in kilns and furnaces, as well as for filtration media in food processing, brewing, and water treatment. The raw material — siliceous fossil meal rather than clay or kaolin — is the defining classification criterion, and importers should obtain mineralogical or compositional analysis from the supplier to support the classification. Products in this heading are industrial commodities and do not require food or agricultural agency admissibility review.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
26 shipments/mo
Conventional refractory bricks are made from high-alumina clays, silica, magnesia, or similar refractory minerals and fall under separate ceramic or refractory headings. Siliceous fossil meal ceramics are specifically manufactured from biogenic silica — diatomite, kieselguhr, or tripolite — giving them a distinctive microporous structure. A mineralogical analysis or manufacturer's raw-material declaration is the standard way to establish this distinction at customs.
Trade-remedy applicability depends on the specific product form, origin, and the applicable 10-digit HTS tariff line. Importers sourcing these ceramic goods from China should check whether the relevant HTS line falls within the scope of Section 301 tariffs, as coverage of industrial ceramic products from China is broad but product-specific. Consulting a licensed customs broker before the first shipment is advisable.
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ImportsExports
Imports
$281KYoY · Pro
Exports
$471KYoY · Pro
12-mo low · imports
YoY · ProFewer than 6 of the last 12 months reported trade above $500K; the trend chart is not shown for thin series.
Through July 2026. Source: U.S. Census Bureau.
Exports · July 2026
destination
Mexico and Canada together take 87% of it.
customs district
Census does not publish district detail for this classification system.
origin
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.