U.S. imports of Refractory Ceramic Goods (Retorts, Crucibles, Muffles, Nozzles, Plugs, etc.), N.E.S. (SITC 66370) totaled $37.6M in August 2026, imported from 46 countries.
Importers of Refractory Ceramic Goods (Retorts, Crucibles, Muffles, Nozzles, Plugs, etc.), N.E.S. paid $2.5M in duties in August 2026, an average duty rate of 6.85% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Refractory Ceramic Goods (Retorts, Crucibles, Muffles, Nozzles, Plugs, etc.), N.E.S. imports of $37.6M in August 2026 ran 13% above the year-to-date monthly average of $33.3M.
Last updated: August 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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2.2K import shipments a month
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.
Basic heading 162 of 766 in section 6
Basic heading 66370 · $37.6M of $27.0B
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Imports · August 2026
origin
Mexico and Japan together supply 53% of it. China pays 35.7% duty; Mexico <0.1%.
customs district
Census does not publish district detail for this classification system.
destination
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.
ImportsExports
Imports
$37.6MYoY · free account
Exports
$35.9MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $394.5M of Refractory Ceramic Goods (Retorts, Crucibles, Muffles, Nozzles, Plugs, etc.), N.E.S. and exported $347.3M.
Through August 2026. Source: U.S. Census Bureau.