U.S. imports of Articles Containing Magnesite, Periclase, Dolomite, or Chromite (HS 681591) totaled $3.3M in August 2026, imported from 20 countries.
Importers of Articles Containing Magnesite, Periclase, 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 dataRefractory and industrial articles of stone or mineral substances containing magnesite, magnesia in periclase form, dolomite, or chromite — used primarily as furnace linings, kiln furniture, and high-temperature industrial components — are classified under heading 681591. The US schedule subdivides this heading by magnesium oxide content, with 6815910011 covering articles where magnesite, dolomite, or chromite exceeds 70% by weight, while 6815910071 and 6815910100 cover remaining NESOI articles. Austria leads US imports under this heading, reflecting its established magnesia refractories industry, with Brazil and Spain also significant sources. These materials are critical inputs for steelmaking, cement production, and glass manufacturing, where thermal stability and chemical resistance are paramount.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
182 import shipments a month
The US tariff schedule distinguishes articles where magnesite, dolomite, or chromite content exceeds 70% by weight (6815910011) from other articles under this heading (6815910071 and 6815910100). Importers must have laboratory analysis or manufacturer certification of the mineral composition to support the correct 10-digit classification. Misclassification between these lines can affect duty liability, so chemical composition documentation should accompany the commercial invoice.
Heading 6902 covers refractory bricks, blocks, tiles, and similar ceramic goods that have been fired during manufacture — the firing process is the key distinction. Articles under 681591 are made of stone or mineral substances but are not necessarily fired ceramic products; they may be chemically bonded or otherwise processed without kiln firing. If a product has been fired to produce a ceramic structure, it likely belongs in Chapter 69 rather than Chapter 68.
Subheading 6 of 7 in heading 6815
Subheading 681591 · $3.3M of $92.7M
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 Containing Magnesite, Periclase, Dolomite, or Chromite and exported $36.3M.
Through August 2026. Source: U.S. Census Bureau.
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HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Imports for consumption | Average duty rate | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 6815910011 | Artcls Cntng Magnt, Dolmt or Chrmt by Wght >70 Mag | $2.9M | 27.25% | 100.00% | $777K |
| 6815910071 | Artcls NESOI Cntng Magnesite, Dolmt or Chromite | $408K | 15.15% | 97.75% | $62K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 6815910100 | Artcls NESOI Cntng Magnesite, Dolmt or Chromite | $2.8M |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
Imports · August 2026
origin
Brazil and Austria together supply 90% of it. Brazil pays 37.5% duty; Austria 10.0%.
customs district
destination
entry
rate provision · imports
0.3% enters free of duty; duty collected equals 25.73% of imports for consumption.