Other
Other refractory ceramic goods (for example, retorts, crucibles, muffles, nozzles, plugs, supports, cupels, tubes, pipes, sheaths, rods and slide gates), other than those of siliceous fossil meals or of similar siliceous earths: > 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 6903.90.00
Alumina Crucible
High-purity alumina ceramic crucible used for melting and holding metals or chemicals at high temperatures in laboratories and foundries. Classified under HTS 6903.90.00 as a refractory ceramic good designed to withstand extreme heat without deforming, distinct from building materials in 6901-6902. Fired after shaping from inorganic nonmetallic materials like alumina oxide.
Zirconia Nozzle for Continuous Casting
Refractory zirconia ceramic nozzle used in steel mills for controlling molten metal flow during continuous casting. Falls under HTS 6903.90.00 as 'other refractory ceramic goods' like nozzles, engineered for extreme thermal shock resistance. Fired ceramic body meets Chapter 69 firing requirements.
Silicon Carbide Thermocouple Tube
Silicon carbide ceramic tube sheathing thermocouples in high-temperature furnaces up to 1600°C. HTS 6903.90.00 covers such refractory tubes and sheaths for industrial thermal protection. Composed of fired nonmetallic carbides per Chapter 69 definition.
Magnesia Slide Gate Plate
Magnesia-carbon ceramic slide gate plate for controlling molten steel flow in ladle casting. Specifically named in HTS 6903.90.00 as refractory slide gates for steelmaking. High-fired refractory withstands 1700°C+ temperatures.
Graphite Crucible with Clay Bond
Clay-bonded graphite crucible for non-ferrous metal melting in jewelry and investment casting. HTS 6903.90.00 as refractory crucible of fired ceramic materials including graphite-carbon composites. Meets Chapter 69 firing and composition requirements.
Refractory Ceramic Furnace Muffle
High-alumina ceramic muffle protecting furnace heating elements from process atmosphere. Named example in HTS 6903.90.00 for refractory muffles used in industrial heat treatment. Fired ceramic construction per Chapter 69 standards.
Ceramic Ladle Plunger
Zirconia-graphite ceramic plunger for stirring molten steel in secondary refining ladles. Refractory 'other goods' under HTS 6903.90.00 for steelmaking immersion devices. High-fired for extreme corrosion resistance.
Silicon Nitride Thermowell
Silicon nitride ceramic thermowell protecting temperature sensors in petrochemical furnaces. HTS 6903.90.00 refractory tubes/sheaths for high-corrosion environments. Advanced nitride ceramics fired per Chapter requirements.
Cordierite Kiln Support Shelf
Cordierite ceramic shelf supporting pottery ware during high-temperature kiln firing. Refractory supports/plugs under HTS 6903.90.00 for ceramic industry equipment. Low thermal expansion fired ceramic.
Reaction-Bonded Silicon Carbide Nozzle
Reaction-bonded SiC ceramic nozzle for powder metallurgy spray drying applications. HTS 6903.90.00 refractory nozzles surviving abrasive high-velocity flows. Fired ceramic per Chapter 69 specs.
Alumina Ceramic Retort
High-alumina ceramic retort for laboratory pyrolysis and gas synthesis reactions. Named refractory good in HTS 6903.90.00 for chemical processing. Pure oxide ceramic fired >1600°C.
Refractory Ceramic Bushing
Zirconia ceramic bushing guiding wires through high-temperature galvanizing furnaces. Refractory tubes/rods under HTS 6903.90.00 for continuous processing. Extreme thermal cycling resistance.
Cupel for Fire Assay
Magnesia ceramic cupel absorbing lead in precious metal fire assay analysis. Specifically named in HTS 6903.90.00 refractory goods for metallurgical testing. Bone ash-magnesia fired composition.
Ceramic Pug Mill Nozzle
Silicon carbide nozzle for high-pressure ceramic pug mills extruding clay products. Refractory nozzle resisting abrasive clay slips under HTS 6903.90.00. Industrial ceramic processing equipment.
Refractory Ceramic Rod for Kiln Cars
High-alumina ceramic leveling rods for kiln car ware supports in sanitaryware firing. HTS 6903.90.00 refractory rods maintaining flat firing surfaces. Engineered for 1400°C+ service.