HS Code for Chamotte

Chamotte, also known as grog or calcined clay, is classified under HS code 2508.70. This classification is determined by its nature as a raw or semi-processed mineral product. Chamotte is produced by the high-temperature calcination of fireclays or other aluminous clays until they reach a state of vitrification or extreme hardness. The resulting material is then crushed and graded. Under the Harmonized System, heading 2508 covers various clays, and subheading 2508.70 specifically identifies chamotte and dinas earths. These materials are essential in the production of refractory ceramics because they reduce shrinkage during the drying and firing of the final product. Because it is a mineral substance that has been heat-treated but not yet formed into a finished article, it remains within the scope of Chapter 25.

Products Included

• Calcined fireclay (grog)
• Crushed refractory brick waste (secondary chamotte)
• Dinas earths
• Granulated calcined clay for ceramic bodies
• High-alumina chamotte for refractory mortars

Common Misclassification

Chamotte is often confused with products in heading 3816, which covers refractory cements, mortars, and concretes. The distinction lies in the level of preparation; 3816 products are mixtures of various minerals and binders ready for use, whereas 2508.70 is a single mineral component. It is also sometimes misclassified under 6806.20 as expanded clays. However, expanded clays are lightweight aggregates produced by bloating the clay, whereas chamotte is a dense, non-bloated material. Additionally, if chamotte is shaped into bricks or tiles, it must be classified in Chapter 69 (Refractory ceramic goods) under codes such as 6902.10 or 6902.20.

FAQ

What is the HS code for chamotte?

The HS code for chamotte and dinas earths is 2508.70.

Is chamotte the same as refractory cement?

No, chamotte is a raw material used to make refractory cement; the cement itself is classified under HS code 3816.00.