Other
Refractory cements, mortars, concretes and similar compositions, including dolomite ramming mix, other than products of heading 3801: > Other
Duty Rate (from China)
Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
Subheadings
Products classified under HTS 3816.00.20
Andalusite-Based Refractory Guniting Mix
Pneumatic-applied mix with andalusite for wear-resistant coatings in blast furnaces. Classified HTS 3816.00.20 as other refractory compositions, high mullite formation for thermal stability.
Silicon Carbide Refractory Mortar
Abrasion-resistant mortar with SiC grains for cyclone burners and burners. HTS 3816.00.20 other mortars, extreme hardness at 1500°C.
Dolomite-Silica Ramming Mix
Blended ramming for coreless induction furnaces, near 3816.00.10 but 'other' if modified. HTS 3816.00.20.
Bauxite Grain Refractory Concrete
Aggregate bauxite concrete for ladle impact zones.
Mullite Refractory Castable
Synthetic mullite for petrochemical heaters.
Kaolin Clay Refractory Mortar
High-purity kaolin for pottery kilns.
Tabular Alumina Refractory Cement
Pre-fired alumina spheres in cement matrix for slide gates.
High-Alumina Refractory Cement
A cement composition primarily made from calcined alumina and calcium aluminate, designed for high-temperature applications in furnaces and kilns. It falls under HTS 3816.00.20 as a refractory cement other than those in heading 3801, providing exceptional resistance to thermal shock and corrosion. Used in lining steel ladles and rotary kilns.
Silica-Based Refractory Mortar
A mortar mix of ground silica, clay binders, and additives for joining refractory bricks in high-heat environments like coke ovens. Classified under HTS 3816.00.20 as 'other' refractory compositions, it withstands temperatures up to 1700°C. Ideal for glassmaking furnaces and incinerators.
Magnesia-Chrome Refractory Concrete
A ready-mix concrete using magnesia, chrome ore, and phosphate binders for erosion-resistant linings in non-ferrous metal smelters. Under HTS 3816.00.20 as other refractory concretes, it offers superior slag resistance at 1600-1800°C. Common in copper and nickel production.
Castable Refractory Mix for Boilers
A pourable, high-purity alumina castable for repairing boiler walls and combustion chambers. HTS 3816.00.20 covers this as other refractory concrete, curing to withstand rapid temperature changes. Used in power plants and industrial boilers.
Zircon-Based Refractory Ramming Mass
A dry ramming mix of zircon flour and clay for induction furnace linings, rammed in place for dense structure. Falls under HTS 3816.00.20 as other refractory compositions, resisting molten metal attack up to 1750°C. Key for foundries.
Phosphate-Bonded Refractory Mortar
Chemical-setting mortar with monoaluminum phosphate binder for fast repairs in steel plant ladles. HTS 3816.00.20 as other refractory mortars, offering abrasion resistance at 1600°C. Preferred for emergency maintenance.
Insulating Refractory Castable
Lightweight castable with ceramic fiber and vermiculite for low thermal conductivity furnace backings. Under HTS 3816.00.20 as other refractory concretes, used behind dense linings in heat processing. Balances insulation and strength.
Chrome-Free Magnesia Refractory Cement
Eco-friendly cement using magnesia and spinel for ladle linings, avoiding hexavalent chrome risks. HTS 3816.00.20 for other refractory cements, service temp 1650°C. Meets modern environmental regs in steelmaking.