Silica-Alumina Backup Refractory Brick
Backup layer refractory brick with balanced >50% SiO2-Al2O3 for furnace hot repair and lining support. Classified in HTS 6902.20.10.20 as 'other' non-fossil meal bricks, fired ceramic constructional goods for industrial refractories. Provides insulation behind wear-resistant hot face bricks.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If containing graphite or carbon as essential ingredient
Carbonaceous refractory articles shift to Chapter 68 heading 6806.
If used as furnace lining blocks in sets
Complete furnace linings or assemblies may classify under 6904 as building blocks beyond individual bricks.
If refractory cements or mortars accompanying bricks
Accompanying binders are Chapter 38 refractories, not fired bricks.
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Import Tips & Compliance
• For mixed cast/jiggered shipments, note US note ratios but primarily for tableware; use for value averaging if applicable
• Ensure packing lists specify 'refractory bricks' to prevent confusion with Chapter 94 building materials
Related Products under HTS 6902.20.10.20
High-Alumina Refractory Firebrick
A refractory brick containing over 50% alumina (Al2O3), fired after shaping for high-temperature resistance in furnaces and kilns. Classified under HTS 6902.20.10.20 as 'other' bricks made from alumina-silica mixtures, designed for constructional use in industrial heating equipment. Meets Chapter 69 requirements for fired ceramic goods excluding those in headings 6901-6903.
Alumina-Silica Refractory Brick for Steel Ladles
Dense refractory brick with >50% combined Al2O3 and SiO2, engineered for lining steel ladles in metallurgy. Falls under HTS 6902.20.10.20 as 'other' bricks for high-heat industrial construction, fired to withstand molten metal exposure. Excludes basic siliceous fossil meal products per hierarchy.
70% Alumina Refractory Brick
Standard 70% Al2O3 refractory brick fired for use in glass tank regenerator checkers and cement kilns. HTS 6902.20.10.20 covers 'other' bricks exceeding 50% alumina or silica, as constructional ceramic goods per Chapter 69 notes. High thermal shock resistance defines its refractory application.
High-Duty Alumina Refractory Brick for Incinerators
High-duty brick with >60% Al2O3 for waste incinerator walls, fired to Chapter 69 standards. HTS 6902.20.10.20 'other' bricks exclude siliceous earths, focusing on alumina-silica for extreme heat construction. Resists chemical erosion from combustion byproducts.
Phosphate-Bonded Alumina Refractory Brick
Phosphate-bonded brick exceeding 50% Al2O3, fired for abrasion resistance in rotary kilns. HTS 6902.20.10.20 as 'other' constructional refractory bricks per Chapter notes on inorganic nonmetallic firing. Bonds enhance strength without compromising refractoriness.