3802.90.20.00 - Activated clays and activated earths

This HTS classification, 3802.90.20.00, specifically covers activated clays and activated earths. These are porous materials, often derived from natural clays or fuller's earth, that have been treated through processes like heating or chemical activation to significantly increase their surface area and adsorption capacity. They are primarily used for their ability to adsorb impurities from liquids and gases, making them valuable in applications such as decolorizing oils and fats, purifying petroleum products, and as catalysts or catalyst supports.

While this subheading falls under the broader heading for activated carbon and other activated natural mineral products, it is distinct from its sibling category, 3802.90.10.00, which is designated for bone black. Bone black is a specific type of activated carbon derived from calcined animal bones and is typically used as a decolorizing agent. The distinction lies in the base material and processing; activated clays and earths are mineral-based, whereas bone black is animal-based.

As a leaf node, 3802.90.20.00 does not have further subcategories. Therefore, classification within this specific code relies on accurately identifying the product as an activated clay or activated earth based on its material composition and intended use, differentiating it from other activated substances or mineral products found elsewhere in the tariff schedule. The key criteria are the presence of a clay or earth base and the activation process that confers high adsorptive properties.