U.S. exports of chamotte or dinas earth (HS 250870) totaled $132K in August 2026.
Chamotte or Dinas Earth imports of $47K in August 2026 ran 55% below the year-to-date monthly average of $104K.
Last updated: August 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.
2 shipments/mo
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.
HSChapter 25
Trade Directory
List your company under HS 250870 — Chamotte or Dinas Earth, so the companies trading it can find you. Be the first supplier listed.
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 2508700000 | Chamotte or Dinas Earth | $47K | 10.00% | 100.00% | $5K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2508700000 | Chamotte or Dinas Earth | $132K |
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.
ImportsExports
Imports
$47KYoY · free account
Exports
$132KYoY · free account
12-mo low · imports
YoY · free accountOver the twelve months to August 2026, the U.S. imported $1.4M of Chamotte or Dinas Earth.
Fewer than 6 of the last 12 months reported trade above $500K; the trend chart is not shown for thin series.
Through August 2026. Source: U.S. Census Bureau.
Subheading 6 of 6 in heading 2508
Subheading 250870 · $132K of $33.4M
Exports · August 2026
destination
Mexico and Canada together take 94% of it.
customs district
origin
entry
rate provision · imports
duty collected equals 10.00% of total import value.