Other
Refractory cements, mortars, concretes and similar compositions, including dolomite ramming mix, other than products of heading 3801: > Other > 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)
Products classified under HTS 3816.00.20.50
Magnesia Ramming Refractory Mortar
A granular refractory mortar made from dead-burned magnesia and phosphate binders for repairing steel ladle linings. It qualifies for HTS 3816.00.20.50 as an 'other' refractory composition, offering superior slag resistance in steelmaking at temperatures exceeding 1600°C. Applied by pneumatic ramming for quick hot repairs.
Basic Refractory Gunning Concrete
Magnesia-spinel based dry gunning mix for basic oxygen furnace repairs. HTS 3816.00.20.50 'other' classification applies for its high lime/magnesia content resisting basic slags up to 1750°C. Applied via high-velocity gunning for minimal downtime.
Alumina-Silicate Patch Refractory Mortar
Quick-setting mortar for patching cracks in rotary kilns, containing mullite and clay. Classified HTS 3816.00.20.50 as other refractory mortar for cement plant use up to 1550°C. Trowel-applied with rapid dry-out capability.
Dolomite-Lime Refractory Ramming Mix
Sintered dolomite with lime binder for ladle impact pads (not pure dolomite ramming). HTS 3816.00.20.50 as other variant for steel ladle bottoms resisting erosion at 1650°C. Provides metallurgical lime addition benefits.
Silicon Carbide Refractory Castable
Castable containing SiC grog for blast furnace tap hole clay guns. HTS 3816.00.20.50 other refractory concrete offers abrasion resistance up to 1600°C. Critical for iron runner maintenance.
Andalusite-Based Refractory Gun Mix
Gunning refractory with andalusite for aluminum reduction cell repairs. HTS 3816.00.20.50 classification for thermal shock resistance to 1500°C. Needle-like crystals enhance mullite formation.
Bauxite Grain Plastic Refractory
Plastic refractory mass with bauxite and phosphate for incinerator hearths. HTS 3816.00.20.50 as other composition, rammed in place up to 1600°C. Self-supporting during heat-up.
Tabular Alumina Gunning Refractory
High-purity tabular alumina for coke oven door linings via gunning. HTS 3816.00.20.50 other refractory provides low porosity at 1750°C service. Petrographic analysis confirms spherical grains.
Mullite Powder Refractory Castable
Synthetic mullite-based castable for glass furnace regenerators. HTS 3816.00.20.50 classification for alkali resistance to 1450°C. 3:2 alumina-silica ratio optimizes creep resistance.
Zircon-Based Gunning Refractory Mix
A dry refractory powder of zircon flour and clay binders for pneumatic gunning onto furnace walls. Falls under HTS 3816.00.20.50 as other refractory concretes, ideal for quick maintenance in glass and aluminum melting furnaces up to 1750°C. Provides excellent corrosion resistance against molten glass.
High Alumina Castable Refractory Cement
A dry-mix refractory cement composed primarily of high-alumina aggregates and calcium aluminate binder, designed for casting into custom shapes that withstand temperatures up to 1800°C. It falls under HTS 3816.00.20.50 as a refractory cement other than those of heading 3801, used in furnaces and kilns for its heat-resistant properties. When mixed with water, it forms a pourable concrete-like material for repairing or lining high-temperature equipment.
Silica Ramming Mass Refractory Mix
A powdered refractory composition of high-purity silica and borax binder used for ramming into linings of induction furnaces. Classified under HTS 3816.00.20.50 as 'other' refractory mortars excluding dolomite mixes and heading 3801 products. It provides excellent thermal shock resistance for molten metal containment up to 1700°C.
Phosphate-Bonded Refractory Mortar
A ready-to-use refractory mortar with monoaluminum phosphate binder and alumina aggregates for jointing firebricks. Classified in HTS 3816.00.20.50 as other refractory mortars, suitable for boiler and incinerator repairs up to 1650°C. Offers strong adhesion and acid resistance.
Chromite-Based Ramming Refractory
Refractory ramming mix using chromite ore and magnesia for electric arc furnace roofs. HTS 3816.00.20.50 covers this as other refractory compositions, resisting chrome-magnesite slag at 1700°C. Used in AOD vessels for stainless steel production.
Insulating Refractory Castable
Lightweight castable refractory with vermiculite and alumina for low thermal conductivity furnace backings. Under HTS 3816.00.20.50 as other refractory concretes, serviceable to 1400°C with density <1.2 g/cm³. Reduces energy loss in heat processing equipment.