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HSChapter 25
U.S. imports of chamotte or dinas earth (HS 250870) totaled $132K in April 2026, traded with 5 countries.
Importers of Chamotte or Dinas Earth paid $13K in duties in April 2026 — an effective duty rate of 10% on $132K in dutiable value, based on actual customs collections rather than the published tariff schedule. Chamotte or Dinas Earth imports of $132K in April 2026 ran 16% above the year-to-date monthly average of $114K.
Last updated: April 2026 dataChamotte (calcined fireclay) and dinas earth (a siliceous refractory material) are foundational raw materials for the refractory products industry, used in manufacturing bricks, castables, and monolithic linings for high-temperature industrial furnaces. Both materials are classified under a single US tariff line, 2508700000, with no further subdivision. Their suitability for specific refractory applications depends heavily on alumina content, grain size distribution, and firing temperature — specifications that trade professionals should confirm with suppliers to ensure compliance with end-use performance standards.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
Chamotte is calcined fireclay with moderate alumina content, used broadly in firebrick and castable refractories. Dinas earth is a high-silica material (typically above 93% SiO₂) used where siliceous refractories are required, such as coke oven and glass furnace applications. Both fall under the same HTS heading but serve distinct technical roles.
While chamotte is an industrial mineral with no mandatory admissibility review, importers should be prepared to provide a material safety data sheet (SDS) and a certificate of analysis specifying alumina and silica content, as these are often required by end-use customers and may be requested by CBP to confirm correct classification.
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| Country | Imports | Exports | Balance |
|---|---|---|---|
| MEXICO | -- | $127K | +$127K |
| FRANCE | $54K | -- | -$54K |
| SPAIN | $38K | -- | -$38K |
| CANADA | -- | $30K | +$30K |
| UNITED KINGDOM | $28K | -- | -$28K |
Monthly import values over time
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 2508700000 | CHAMOTTE OR DINAS EARTH | $132K | 10.00% | $13K |
CHAMOTTE OR DINAS EARTH
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2508700000 | CHAMOTTE OR DINAS EARTH | $169K |
CHAMOTTE OR DINAS EARTH
399 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
UNGRND NAT CAL PHSPH, ALUM CAL PHOS A PHOS CHALK
HS 251010
FLUORSPAR OV 97% OF CALCIUM FLUORD BY WGHT
HS 252922
PEBBLES, GRAVEL ETC. FOR CONCRETE AGGREGATES ETC.
HS 251710
| Port | Imports | Exports | Balance |
|---|---|---|---|
| LAREDO, TX | -- | $102K | +$102K |
| NEWARK, NJ | $54K | -- | -$54K |
| NORFOLK-NEWPORT NEWS, VA | $34K | -- | -$34K |