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HSChapter 25
U.S. imports of dolomite, not calcined or sintered (HS 251810) totaled $5.9M in June 2026, traded with 7 countries.
Importers of Dolomite, Not Calcined or Sintered paid $52K in duties in June 2026 — an effective duty rate of 9.4% on $551K in dutiable value, based on actual customs collections rather than the published tariff schedule. Dolomite, Not Calcined or Sintered imports of $5.9M in June 2026 ran 120% above the year-to-date monthly average of $2.7M.
Last updated: June 2026 dataRaw, uncalcined dolomite — a calcium magnesium carbonate mineral — is used as a flux in steelmaking, a filler in glass and ceramics, and a soil conditioner in agriculture, all before any heat treatment alters its chemistry. US imports enter under tariff line 2518100000, with Canada the dominant supplier by virtue of geographic proximity and large carbonate rock deposits. Italy, Mexico, Spain, and Germany round out the principal sources, reflecting Europe's significant dolomite quarrying sector. Purity levels (MgO and CaO content) are the primary commercial grade specifications that determine suitability for metallurgical versus agricultural applications.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
The distinction is purely thermal processing: dolomite that has not been subjected to calcination (high-temperature firing to drive off CO₂) or sintering remains under 2518100000. Once heat-treated to produce reactive magnesia and lime, the product shifts to 2518200000. Importers should obtain mill certificates confirming whether any thermal processing occurred at origin.
Steel producers use raw dolomite as a basic flux and refractory lining material. Glass manufacturers use it as a source of magnesium oxide. Agricultural suppliers use finely ground dolomite as a liming agent to neutralize acidic soils. Each end use has distinct purity and particle-size requirements.
Monthly import values over time
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 2518100000 | DOLOMITE NOT CALCINED OR SINTERED | $5.9M | 0.88% | 9.33% | $52K |
DOLOMITE NOT CALCINED OR SINTERED
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2518100000 | DOLOMITE NOT CALCINED OR SINTERED | $96K |
DOLOMITE NOT CALCINED OR SINTERED
926 t
PORTLAND CEMENT EXCEPT WHITE PORTLAND CEMENT
HS 252329
SULFUR OF ALL KINDS, NOT SUBLIMED,PRECIP,COLLOIDAL
HS 250300
SALT INCL TBL/DENTRD, PURE SODM CHLOR ETC; SEA WTR
HS 250100
FUSED MAGNESIA; DEAD-BURN MAGNESIA; MAGNESIA NESOI
HS 251990
FLUORSPAR OV 97% OF CALCIUM FLUORD BY WGHT
HS 252922
UNGRND NAT CAL PHSPH, ALUM CAL PHOS A PHOS CHALK
HS 251010
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| Port | Imports | Exports | Balance |
|---|---|---|---|
| SAGINAW-BAY CITY, MI | $926K | -- | -$926K |
| DETROIT, MI | $893K | $21K | -$872K |
| PORT HURON, MI | $810K | $11K | -$799K |