Kieselguhr Insulating Brick
Insulating ceramic brick produced from kieselguhr (diatomite), offering excellent thermal resistance for boiler linings and high-heat applications. Classified under HTS 6901.00.00.00 due to its composition from siliceous fossil meals fired after shaping.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If containing >50% alumina or silica from non-fossil sources
High-alumina refractory bricks shift to 6902 regardless of minor fossil meal content.
If finished building tiles rather than raw blocks
Fired ceramic tiles for construction (not fossil meal specific) classify under 6904-6914.
If crude or powdered form, not shaped/fired
Unprocessed diatomaceous earth is a mineral product in Chapter 25, excluded from fired ceramics.
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Import Tips & Compliance
• Include lab test results showing water absorption and silica content typical of diatomaceous earth
• Ensure marking indicates 'diatomite' or 'kieselguhr' composition for customs verification
• Avoid mixing with clay products in shipments to prevent average absorption calculations affecting classification
Related Products under HTS 6901.00.00.00
Diatomaceous Earth Firebrick
A high-temperature resistant brick made from diatomaceous earth (kieselguhr), a siliceous fossil meal, shaped and fired for use in industrial furnaces and kilns. It falls under HTS 6901.00.00.00 as a ceramic good specifically of siliceous fossil meals, providing superior insulation due to its low thermal conductivity.
Tripolite Ceramic Block
Heavy-duty ceramic block made from tripolite, a siliceous fossil earth similar to diatomite, used in furnace construction. HTS 6901.00.00.00 covers such goods explicitly including 'similar siliceous earths' that are shaped and fired.
Diatomite Pool Filter Block
Ceramic block composed of diatomaceous earth for use in swimming pool filtration systems, providing high porosity after firing. Falls under HTS 6901.00.00.00 as 'other ceramic goods' of siliceous fossil meals.
Kieselguhr Roofing Tile
Lightweight roofing tile manufactured from kieselguhr for thermal insulation in construction. HTS 6901.00.00.00 includes tiles of siliceous fossil meals, distinct from common clay tiles.
Tripolite Absorbent Brick
Absorbent ceramic brick from tripolite used in industrial spill control and chemical absorption. Classified in HTS 6901.00.00.00 for ceramic goods of similar siliceous earths fired after shaping.
Diatomaceous Earth Kiln Shelf
Fired ceramic shelf made from diatomite for supporting pottery in kilns, valued for lightweight insulation. HTS 6901.00.00.00 applies to such 'other ceramic goods' of siliceous fossil meals.