Silico-Aluminous Refractory Brick
Silico-aluminous refractory bricks blend silica and alumina for use in blast furnace hearths and checker chambers, fired to achieve low porosity and high strength. They resist slag corrosion and thermal cycling in metallurgical applications. Fits HTS 6902.90.10.20 as 'other' refractory bricks excluding siliceous fossil meal types.
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% chromic oxide
Chromia-dominant bricks classify under 6902.10 due to specific oxide content.
If for general building construction, not high-temp
Non-refractory ceramic bricks for buildings go to 6904, based on end-use not exceeding 1000°C.
If unfired or chemically bonded
Unfired refractory cements or mixes fall under 3824, excluded from Chapter 69 per notes.
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Import Tips & Compliance
• Include technical datasheets confirming refractoriness under load (RUL) at 1400°C+ to support classification
• Label shipments clearly as 'refractory constructional goods' to prevent confusion with ornamental ceramics
• Check for anti-dumping duties on specific origins; obtain scope rulings if composition borders on 6902.20
Related Products under HTS 6902.90.10.20
High-Alumina Refractory Firebrick
High-alumina refractory firebricks are composed primarily of alumina and silica, 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 durability. Classified under HTS 6902.90.10.20 as refractory bricks other than those made from siliceous fossil meals.
Mullite Refractory Brick
Mullite refractory bricks, made from sintered mullite (3Al2O3·2SiO2), offer superior creep resistance for glass tank regenerator checkers and rotary kilns. Fired after shaping to ensure impermeability to gases. Covered by HTS 6902.90.10.20 for other refractory bricks.
Andalusite Refractory Brick
Andalusite refractory bricks incorporate andalusite for enhanced thermal shock resistance, ideal for coke oven doors and reheat furnace roofs. Fired ceramic goods shaped from clay-silica mixes. HTS 6902.90.10.20 applies to these non-specialty refractory bricks.
Fireclay Refractory Brick
Fireclay refractory bricks from high-alumina fireclay provide economical lining for boiler walls and ladles, with good abrasion resistance. Properly fired after room-temperature shaping per Chapter 69 requirements. Classed in HTS 6902.90.10.20 as other refractory bricks.
Silimanite Refractory Brick
Silimanite refractory bricks feature sillimanite minerals for high refractoriness in electric arc furnace roofs. Dense fired structure resists molten metal penetration. HTS 6902.90.10.20 for other refractory brick types.
Kaolin-Based Refractory Brick
Kaolin-based refractory bricks utilize calcined kaolin for moderate-temperature applications like backup linings in cement kilns. Fired ceramic constructional goods meeting Chapter 69 criteria. Under HTS 6902.90.10.20.