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SITCSection 6
U.S. imports of refractory ceramic goods (retorts, crucibles, muffles, nozzles, plugs, etc.), n.e.s. (SITC 66370) totaled $35.5M in April 2026, traded with 40 countries.
Importers of Refractory Ceramic Goods (Retorts, Crucibles, Muffles, Nozzles, Plugs, etc.), N.E.S. paid $2.5M in duties in April 2026 — an effective duty rate of 12% on $20.6M in dutiable value, based on actual customs collections rather than the published tariff schedule. Refractory Ceramic Goods (Retorts, Crucibles, Muffles, Nozzles, Plugs, etc.), N.E.S. imports of $35.5M in April 2026 ran 12% above the year-to-date monthly average of $31.6M.
Last updated: April 2026 dataFired ceramic components engineered to withstand extreme temperatures — including retorts, crucibles, muffles, nozzles, and plugs — are essential consumables in steelmaking, glass manufacturing, foundry operations, and chemical processing. The NES designation here means these goods are not covered by more specific refractory headings, and classification often hinges on the ceramic composition (alumina, silica, zirconia content) and the specific industrial function. China is a dominant global producer of refractory ceramic shapes, and imports from that origin may be subject to Section 301 tariffs, making origin and composition documentation commercially critical.
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Common compositions include high-alumina, silica, magnesia, and zirconia-based ceramics, each suited to different temperature and chemical-resistance requirements. Composition can affect HTS subheading assignment at the 10-digit level, which in turn determines the applicable duty rate and any trade-remedy exposure. Importers should obtain a certified composition analysis from the manufacturer.
Many refractory ceramic goods originating in China are subject to Section 301 tariffs. The specific rate depends on the applicable HTS subheading, and importers should verify current Section 301 list coverage and any granted exclusions through the USTR and CBP databases before finalizing sourcing decisions.
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Monthly import values over time