HS Code for Kieselguhr

Kieselguhr, also known as 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. This material is composed of the fossilized remains of diatoms, which are microscopic algae. The classification within Chapter 25 (Salt; sulfur; earths and stone; plastering materials, lime and cement) is reserved for natural mineral substances that have not been chemically modified or activated. The inclusion of \"calcined\" in the heading means that kieselguhr that has been heat-treated to remove volatile impurities remains under 2512.00. However, the specific gravity requirement is a technical threshold used by customs authorities to distinguish these lightweight siliceous earths from denser mineral sands or clays. Kieselguhr is widely used as a filtration aid, an abrasive, and an insecticide. Its classification is strictly dependent on its physical properties and the lack of chemical activation. If the material is mixed with other substances or significantly altered, it may fall under different chapters entirely.

Products Included

• Natural kieselguhr
• Calcined kieselguhr (unactivated)
• Diatomite
• Tripolite
• Moler earth

Common Misclassification

The most frequent misclassification occurs with HS code 3802.90, which covers activated kieselguhr or activated diatomite. Activation involves chemical treatment to increase surface area. It is also sometimes confused with 2505.10 (silica sands) or 2508.10 (bentonite) due to similar industrial applications.

FAQ

What is the HS code for Kieselguhr?

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

Does this code include activated diatomaceous earth?

No, activated diatomaceous earth is classified under HS code 3802.90.