HS code · 6-digit subheading
HS Code 2508.70 – Clays (excluding expanded clays of heading no. 6806); chamotte or dinas earths
HS code 2508.70 is the 6-digit subheading for clays (excluding expanded clays of heading no. 6806), chamotte or dinas earths. It is used for chamotte grog, calcined chamotte, dinas earth, refractory chamotte and fireclay grog.
What HS 2508.70 covers
This HS code covers chamotte or dinas earths, whether or not calcined, excluding expanded clays. Chamotte is essentially calcined fireclay, while dinas earth is a calcined silica-rich refractory material. Both are specifically prepared refractory clays, crucial for their high-temperature resistance, low thermal expansion, and consistent properties. They are indispensable components in the manufacture of refractory bricks, crucibles, and other high-temperature industrial linings, providing structural integrity and thermal stability in extreme environments found in steel, cement, glass, and petrochemical industries. Importers are typically heavy industries in manufacturing hubs, while exporters are countries with the raw materials and specialized calcination facilities, such as China, the USA, and Ukraine. Trade focuses on the specific refractory properties, grain size, and chemical composition required for particular applications.
- Covers
- Chamotte grog
- Calcined chamotte
- Dinas earth
- Refractory chamotte
- Fireclay grog
- Calcined fireclay (specific for chamotte)
- Silica dinas
- Chamotte powder.
- Examples
- RHI Magnesita (refractory materials)
- Vesuvius (refractory products)
- HarbisonWalker International (HWI)
- Resco Products
- Krosaki Harima.
Codes often confused with 2508.70
Common mistake. Often confused with raw fireclay (250830) or other general calcined clays, but chamotte and dinas earths refer to specific calcined forms primarily used in high-performance refractory applications.
Top exporters and importers of HS code 250870, 2025
In 2025, the largest exporter of HS code 250870 in UN Comtrade data was France, with 21% of world exports; the largest importer in UN Comtrade data was Germany, with 19% of world imports. Countries that did not report 2025 data are estimated from partner records, which can understate them.
Top exporters 2025 · share of world exports
- 1 France $15M 21% of world exports
- 2 Germany $13M 17% of world exports
- 3 Czechia $12M 17% of world exports
World total: $74M Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 Germany $19M 19% of world imports
- 2 Türkiye $13M 13% of world imports
- 3 Netherlands $9.4M 9.7% of world imports
World total: $97M Reported figures on UN Comtrade ↗
How these figures are built
109 countries reported 2025 trade to UN Comtrade in HS 2022, and their own totals are used. Countries that did not report are estimated from what other countries recorded trading with them. Those estimates miss trade with other non-reporting countries, so they can be low, and a non-reporting country can rank higher than shown or be missing from the list. World totals add both and leave out trade between two non-reporting countries. Figures are in current US dollars; reported imports are mostly valued CIF and exports FOB, and exports include re-exports. The UN Comtrade links show the underlying records; they can also list a few reporters left out here (regional groups and older HS editions).
Source: UN Comtrade (United Nations Statistics Division), 2025 annual data.
Brazil NCM code for 2508.70
Brazil does not split HS 2508.70: its NCM code is 2508.70.00.
All Brazil NCM codes in heading 25.08 →
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text is official; the English is our translation.
Questions about HS 2508.70
What is HS code 250870?
HS code 250870 is a 6-digit subheading in the Harmonized System that covers: Clays (excluding expanded clays of heading no. 6806); chamotte or dinas earths. This HS code covers chamotte or dinas earths, whether or not calcined, excluding expanded clays. Chamotte is essentially calcined fireclay, while dinas earth is a calcined silica-rich refractory material. Both are specifically prepared refractory clays, crucial for their high-temperature resistance, low thermal expansion, and consistent properties. They are indispensable components in the manufacture of refractory bricks, crucibles, and other high-temperature industrial linings, providing structural integrity and thermal stability in extreme environments found in steel, cement, glass, and petrochemical industries. Importers are typically heavy industries in manufacturing hubs, while exporters are countries with the raw materials and specialized calcination facilities, such as China, the USA, and Ukraine. Trade focuses on the specific refractory properties, grain size, and chemical composition required for particular applications.
What products fall under HS code 250870?
Chamotte grog, calcined chamotte, dinas earth, refractory chamotte, fireclay grog, calcined fireclay (specific for chamotte), silica dinas, chamotte powder.
What are common misclassifications for HS code 250870?
Often confused with raw fireclay (250830) or other general calcined clays, but chamotte and dinas earths refer to specific calcined forms primarily used in high-performance refractory applications.
Which countries are the top exporters of goods under HS code 250870?
In 2025, the top exporters of HS code 250870 in UN Comtrade data were France ($15M, 21% of world exports), Germany ($13M) and Czechia ($12M). World exports came to about $74M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
Which countries are the top importers of goods under HS code 250870?
In 2025, the top importers of HS code 250870 in UN Comtrade data were Germany ($19M, 19% of world imports), Türkiye ($13M) and the Netherlands ($9.4M). World imports came to about $97M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
How is HS code 250870 structured?
HS code 250870 is a 6-digit subheading under the Harmonized System. The first 2 digits (25) identify the chapter, digits 3-4 (08) identify the heading, and digits 5-6 (70) specify the subheading. This code is standardized globally by the World Customs Organization.
What is the Brazil NCM code for HS code 250870?
In Brazil, HS code 250870 is NCM 2508.70.00. The last two digits are 00 because Brazil does not split this HS code further.