U.S. imports of chamotte or dinas earth (HS 250870) totaled $132K in April 2026, traded with 5 countries.
Last updated: April 2026 dataChamotte (grog) is calcined or pre-fired refractory clay ground to aggregate form, while Dinas earth is a high-silica ganister used in silica brick manufacture — both are critical inputs for the steel, glass, and cement kiln industries where dimensional stability under thermal cycling is paramount. Both materials are captured under a single US tariff line (2508700000). France is the leading supplier to the US market, with the Czech Republic and Sweden also among the primary sources.
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Chamotte is calcined fireclay aggregate used to reduce shrinkage in refractory products, while Dinas earth is a siliceous ganister used specifically in silica brick production. The HS system groups them together under 250870 because both are processed refractory raw materials derived from natural earths, and their trade volumes and end uses are closely related.
France is the top supplier, followed by the Czech Republic and Sweden. The United Kingdom and Spain are also among the notable source countries for these refractory materials.
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Imports
$132K
from 5 countries · YTD: $456K
Exports
$169K
Surplus of $37K (net exporter)
Trade balance: surplus of $37K (net exporter)
YTD: $456K imported (April 2026)
14 shipments/month
Monthly import values over time
SALT INCL TBL/DENTRD, PURE SODM CHLOR ETC; SEA WTR
HS 250100
PORTLAND CEMENT EXCEPT WHITE PORTLAND CEMENT
HS 252329
SULFUR OF ALL KINDS, NOT SUBLIMED,PRECIP,COLLOIDAL
HS 250300
NATURAL BARIUM SULFATE (BARYTES)
HS 251110
FLUORSPAR OV 97% OF CALCIUM FLUORD BY WGHT
HS 252922
UNGRND NAT CAL PHSPH, ALUM CAL PHOS A PHOS CHALK
HS 251010
Top U.S. entry points for this product, ranked by latest-month import value.