Acid-Resistant Fireclay Refractory Brick
Fireclay brick engineered for resistance to acidic slags and gases in chemical processing kilns. Fired from high-silica clay content for durability at 1350-1500°C. Precisely matches HTS 6902.90.10.10 for other clay refractory bricks.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If made from chromite or magnesite
Different mineral base compositions have dedicated subheadings beyond clay.
If for laboratory furnace construction
Lab ceramic ware excludes general refractory construction goods.
If imported as raw calcined clay
Prepared ceramic clays without shaping/firing classified as raw materials in Chapter 25.
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Import Tips & Compliance
• Include chemical analysis showing SiO2 >60% for acid resistance claims during customs valuation
• Avoid co-mingling with basic clay bricks in shipments; segregate for accurate 10.10 suffix reporting
Related Products under HTS 6902.90.10.10
High-Alumina Fireclay Refractory Brick
A dense refractory brick made primarily from fireclay, fired at high temperatures to withstand extreme heat up to 1700°C. Used in furnace linings and kilns for its excellent thermal shock resistance and abrasion resistance. Classified under HTS 6902.90.10.10 as a clay-based refractory brick, distinct from siliceous or high-silica variants.
Standard Fireclay Refractory Brick
Standard-sized refractory brick composed of fireclay, designed for boiler and incinerator linings with service temperatures up to 1500°C. Offers good mechanical strength and chemical resistance to slags. Falls under HTS 6902.90.10.10 specifically for clay-composed refractory bricks other than siliceous types.
Shaped Fireclay Refractory Brick for Glass Furnaces
Custom-shaped fireclay bricks designed specifically for glass tank furnace crowns and walls, resisting molten glass corrosion at 1500°C+. Made from selected clay blends and high-fired. Classed under 6902.90.10.10 as clay refractory bricks.
Fireclay Checker Brick for Regenerators
Perforated fireclay bricks arranged in checkerwork patterns for heat recovery regenerators in glass and steelmaking furnaces. Optimized channels for gas flow at 1300-1400°C service. Specifically clay refractory bricks under HTS 6902.90.10.10.
Super-Duty Fireclay Refractory Brick
Premium super-duty fireclay brick with superior creep resistance for crown construction in reheating furnaces serving at 1500°C+. Low iron formulation enhances slag resistance. HTS 6902.90.10.10 clay brick classification.
Plastic Fireclay Refractory Brick
Fireclay brick produced via plastic forming method for complex shapes in boiler settings and ladle backup. Excellent workability and fired strength up to 1480°C. Clay-based refractory brick under 6902.90.10.10.