Diatomite Thermal Insulation Block
High-porosity thermal insulation block from diatomaceous earth for ovens and high-heat enclosures. HTS 6901.00.00.00 specifically for blocks of siliceous fossil meals.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If clay chimney liners
Clay-based refractory construction goods go to 6906.
If unfired exfoliated forms
Unfired agglomerated siliceous materials classify in 6806.
If special refractory bricks
Highly engineered refractory shapes move to 6903.
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Import Tips & Compliance
• Include thermal conductivity data (<0.15 W/mK typical for diatomite)
• Certify no organic binders exceeding Chapter 69 curing exclusions
• Invoice as 'blocks' not 'boards' to match terminology
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.
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.
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.