Insulating Clay Refractory Blocks
Lightweight clay refractory blocks with insulating properties for boiler and incinerator construction, fired from shaped clay mixtures. HTS 6902.90.50.10 covers these as clay-based refractory blocks other than siliceous types. They minimize heat loss in high-temperature applications.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If other refractory ceramic blocks not purely clay-based
Blends with oxides or carbides beyond clay limits classify under the broader 'other refractory' category.
If made from siliceous fossil meals like kieselguhr
Specific exclusion in heading notes directs siliceous earth products to Chapter 68.
If repurposed as porcelain lab crucibles
End-use as laboratory porcelain ware changes classification to Chapter 69 tableware/labs.
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Import Tips & Compliance
• Include thermal conductivity test results (<0.5 W/mK typical) to substantiate refractory insulation claims
• Ensure packing lists specify 'fired clay refractory' to avoid scrutiny as unfinished goods
• Check for chrome content; if >10%, may require additional hazardous material declarations
Related Products under HTS 6902.90.50.10
Clay Refractory Fire Bricks
High-alumina clay fire bricks designed for lining industrial furnaces and kilns, fired after shaping to withstand temperatures exceeding 1500°C. Classified under HTS 6902.90.50.10 as refractory bricks made primarily from clay, excluding siliceous fossil meals. These constructional goods provide thermal insulation and chemical resistance in high-heat environments.
High-Duty Clay Refractory Tiles
Clay-based refractory tiles used for flooring and lining in steel mill reheat furnaces, shaped and fired to endure extreme thermal shock. Falls under HTS 6902.90.50.10 as clay-composed refractory constructional tiles, distinct from siliceous earth products. Ideal for harsh industrial environments requiring durability.
Shaped Clay Refractory Anchor Bricks
Specialty clay anchor bricks for securing fiber module linings in furnaces, precision-shaped and high-fired. Classified in HTS 6902.90.50.10 for clay refractory constructional goods. Essential for modular refractory installations in petrochemical plants.
Plastic Clay Refractory Rammer Mix Bricks
Pre-formed bricks from plastic clay ramming mixes for repairing furnace linings, fired after on-site shaping. HTS 6902.90.50.10 applies to these clay refractory blocks. Used in maintenance of glass melting tanks and ladles.
Clay Checker Bricks for Regenerators
Perforated clay checker bricks for heat recovery regenerators in glass and steel industries, fired to refractory standards. Under HTS 6902.90.50.10 as clay constructional refractory bricks. Optimize energy efficiency through thermal storage.