HS Code for Diatomite

Diatomite, also known as kieselguhr or diatomaceous earth, is classified under HS code 2512.00. This heading covers siliceous fossil meals and similar siliceous earths, whether or not calcined, provided they have an apparent specific gravity of 1 or less. Chapter 25 generally includes mineral products in their crude state or washed, crushed, or calcined. Diatomite is a naturally occurring, soft, siliceous sedimentary rock that is easily crumbled into a fine white to off-white powder. The classification remains in 2512.00 even if the product has been calcined (heated) to remove organic impurities or to change its color, as long as it has not been mixed with other substances or processed into a finished article. This material is highly valued for its filtration properties, as an abrasive, and as a filler in various industrial applications. The low specific gravity is a critical technical requirement for classification under this specific code.

Products Included

• Crude diatomaceous earth
• Calcined diatomite
• Kieselguhr powder
• Tripolite
• Moler earth

Common Misclassification

Diatomite is often confused with HS code 3802.90, which covers activated diatomite. If the diatomite has been chemically treated to increase its surface activity or filtration efficiency, it moves from Chapter 25 to Chapter 38. It is also sometimes misclassified under 2505 (natural sands) or 2508 (other clays), but its fossilized organic origin and specific gravity distinguish it from these categories. Additionally, finished products like diatomite bricks move to Chapter 69.

FAQ

What is the HS code for Diatomite?

The HS code for diatomite, including kieselguhr and similar siliceous fossil meals, is 2512.00.

Does calcination change the HS code for diatomite?

No, HS code 2512.00 explicitly includes diatomite whether or not it has been calcined, provided it hasn't been mixed with other materials.