Fireclay Refractory Block
Fireclay refractory blocks are made from high-temperature fired clay, used in blast furnace hearths and cement kilns for their plasticity and strength. They absorb shocks and resist abrasion. Fits HTS 6902.90.50 as other non-siliceous refractory constructional goods.
Import Duty Rates by Country of Origin
More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If high alumina fireclay variants
Alumina >50% moves to specific alumina refractory category.
If blended with magnesite
Magnesia additions classify under chromite/magnesite provisions.
If imported as raw unfired fireclay
Raw clays are Chapter 25 commodities, not fired Chapter 69 products.
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Import Tips & Compliance
• Test water absorption per ASTM C373 if borderline earthenware; must be refractory fired
• Specify clay composition excluding siliceous fossil meals for correct subheading
Related Products under HTS 6902.90.50
Mullite Refractory Brick
Mullite refractory bricks, synthesized from kaolin and fired, used in aluminum smelters for creep resistance at 1600°C+. Excellent for reducing atmospheres. Classed HTS 6902.90.50 other refractories.
Andalusite Refractory Tile
Andalusite refractory tiles fired from andalusite ore for torpedo ladle linings in steel plants, offering thermal shock resistance. HTS 6902.90.50 applies.
Bauxite Refractory Brick
Bauxite-based refractory bricks fired for lime kilns and incinerators. Good load-bearing at high temps. HTS 6902.90.50.
Chamotte Refractory Block
Chamotte (fired clay grog) refractory blocks for general furnace construction. Stable volume, low deformation. HTS 6902.90.50.
Cordierite Refractory Brick
Cordierite bricks for tunnel kilns in ceramics industry, excellent thermal shock resistance. Fired magnesia-alumina-silicate. HTS 6902.90.50.
High-Alumina Refractory Firebrick
High-alumina refractory firebricks are ceramic bricks composed primarily of alumina, fired at high temperatures to withstand extreme heat above 1500°C. They are used in furnace linings and kilns for their excellent thermal shock resistance and corrosion resistance. Classified under HTS 6902.90.50 as refractory ceramic constructional goods other than siliceous fossil meals, due to their fired ceramic composition for high-temperature industrial applications.