U.S. imports of Articles of Mineral Substances Containing Magnesite, Dolomite, or Chromite (SITC 66338) totaled $3.3M in August 2026, imported from 20 countries.
Importers of Articles of Mineral Substances Containing Magnesite, Dolomite, or Chromite paid $839K in duties in August 2026, an average duty rate of 25.73% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule.
Last updated: August 2026 dataMagnesite, dolomite, and chromite give these mineral articles their defining refractory and chemical-resistance properties, making them critical inputs for steelmaking furnace linings, cement kilns, and high-temperature industrial processes. Classification under this heading turns on the specific mineral content — magnesite-based shapes behave differently in duty and end-use terms than chromite-bearing articles. Importers should verify the mineral composition documentation carefully, as misclassification between this heading and adjacent refractory ceramic or stone-article headings is a common audit trigger.
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182 import shipments a month
The key distinction is material composition: this heading covers articles whose functional basis is magnesite, dolomite, or chromite in mineral (non-ceramic) form. Refractory ceramic goods are classified separately based on their fired-ceramic character. Importers should obtain mill certificates or composition analyses to support the correct classification, and consulting a licensed customs broker is advisable given the technical overlap.
Customs entries for these articles are typically supported by a manufacturer's certificate of composition, a material safety data sheet (MSDS/SDS), or a third-party laboratory analysis confirming the magnesite, dolomite, or chromite basis. Without such documentation, CBP may reclassify the goods under a residual mineral-articles heading.
Basic heading 467 of 766 in section 6
Basic heading 66338 · $3.3M of $27.0B
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Imports · August 2026
origin
Brazil and Austria together supply 90% of it. Brazil pays 37.5% duty; Austria 10.0%.
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
$3.3MYoY · free account
Exports
$2.8MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $46.6M of Articles of Mineral Substances Containing Magnesite, Dolomite, or Chromite and exported $36.3M.
Through August 2026. Source: U.S. Census Bureau.