6901.00.00.00 - Bricks, blocks, tiles and other ceramic goods of siliceous fossil meals (for example, kieselguhr, tripolite or diatomite) or of similar siliceous earths

This HTS category, 6901.00.00.00, encompasses a specific group of ceramic products manufactured from siliceous fossil meals or similar siliceous earths. Key materials within this classification include kieselguhr, tripolite, and diatomite, which are characterized by their high silica content and porous structure. The resulting ceramic goods, such as bricks, blocks, and tiles, often possess unique properties like high absorbency, thermal insulation, or abrasive qualities, making them suitable for specialized industrial applications.

Unlike other ceramic products found in Chapter 69, which may be made from a broader range of clays and minerals, this category is strictly defined by its raw material composition. When classifying goods, it is crucial to ascertain whether the siliceous fossil meal or earth constitutes the primary component of the ceramic article. The physical form of the finished product – whether brick, block, tile, or another ceramic article – further solidifies its placement within this specific HTS code.

As this node represents a leaf node within the HTS structure, there are no further subdivisions. Therefore, precise identification relies on confirming the material composition and the nature of the finished ceramic good. Common applications for these specialized ceramics include filtration media, insulation materials, and components in the manufacture of refractories or other industrial products where the unique properties of diatomaceous earth are leveraged.