Chamotte or Dinas Earth Imports to the U.S., 2026 — $132K

HS 250870

Chamotte or Dinas Earth

U.S. imports of chamotte or dinas earth (HS 250870) totaled $132K in April 2026, traded with 5 countries.

Last updated: April 2026 data

Chamotte (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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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

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Import Trend (12 months)

Monthly import values over time

Geographic Breakdown

SALT INCL TBL/DENTRD, PURE SODM CHLOR ETC; SEA WTR

HS 250100

$73.0M

PORTLAND CEMENT EXCEPT WHITE PORTLAND CEMENT

HS 252329

$64.5M

SULFUR OF ALL KINDS, NOT SUBLIMED,PRECIP,COLLOIDAL

HS 250300

$35.6M

NATURAL BARIUM SULFATE (BARYTES)

HS 251110

$26.0M

FLUORSPAR OV 97% OF CALCIUM FLUORD BY WGHT

HS 252922

$18.4M

UNGRND NAT CAL PHSPH, ALUM CAL PHOS A PHOS CHALK

HS 251010

$14.0M

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Frequently Asked Questions

What distinguishes chamotte from Dinas earth, and why are they classified together?

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.

Who are the leading foreign sources of chamotte and Dinas earth imported into the US?

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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