HS Code for Bentonite

Bentonite is classified under HS code 2508.10, which is situated within Chapter 25 of the Harmonized System, covering salt, sulfur, earths and stone, plastering materials, lime, and cement. This specific subheading is dedicated to bentonite, a colloidal clay consisting mainly of montmorillonite. The classification applies regardless of whether the clay has been calcined (heated to high temperatures to remove volatile substances). The primary criterion for classification here is that the material remains a natural earth product that has not been chemically modified or activated. Bentonite is valued for its swelling properties when mixed with water, making it essential for drilling muds, foundry sand bond, and iron ore pelletizing. The Harmonized System treats bentonite as a raw mineral product, provided it has not been processed beyond the allowances of Chapter 25, such as washing, grinding, or heat treatment. In the context of international trade, the purity and physical state of the bentonite are paramount. While Chapter 25 allows for basic mechanical processing, any addition of polymers or significant chemical surfactants to create "premium" drilling grades can sometimes complicate the classification, though most standard industrial bentonites remain firmly within 2508.10.

Products Included

• Natural sodium bentonite
• Calcium bentonite (non-activated)
• Calcined bentonite clay
• Bentonite powder for drilling mud
• Foundry grade bentonite

Common Misclassification

A frequent misclassification occurs with HS code 3802.90, which covers activated natural mineral products. If bentonite has been treated with acid or other chemicals to change its structure for better filtration (activated clay), it must be classified under 3802. It is also sometimes confused with 3004.90 if packaged for medicinal use as an antacid, though the bulk mineral remains in 2508.10.

FAQ

What is the HS code for Bentonite?

The HS code for natural or calcined bentonite is 2508.10.

Is calcined bentonite classified differently?

No, HS code 2508.10 specifically includes bentonite whether or not it has been calcined, provided it has not been otherwise chemically modified.