Containing by weight more than 50 percent of alumina (Al2O3) or of a mixture or compound of alumina and of silica (SiO2)
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: > Containing by weight more than 50 percent of alumina (Al2O3) or of a mixture or compound of alumina and of silica (SiO2)
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 6903.20.00.00
Alumina Crucible for Laboratory Use
High-purity alumina crucible designed for melting and holding metals or chemicals in laboratory furnaces, containing over 90% Al2O3 by weight. Fired after shaping at high temperatures exceeding 800°C, it qualifies as a refractory ceramic good under HTS 6903.20.00.00 due to its alumina content and use in high-temperature processes.
High-Alumina Ceramic Nozzle for Continuous Casting
Refractory nozzle made from alumina-silica mixture (>70% Al2O3) used in steel continuous casting to control molten metal flow. Fired ceramic construction withstands extreme temperatures, classified under HTS 6903.20.00.00 as other refractory ceramic goods.
Alumina Thermocouple Protection Tube
Fired alumina ceramic tube (99% Al2O3) protecting thermocouples in high-temperature furnaces and kilns. Essential refractory component for temperature measurement in industrial processes, falling under HTS 6903.20.00.00.
Refractory Alumina Slide Gate Plate
High-alumina (85% Al2O3) ceramic plate used in steel ladle slide gate systems to control molten steel flow. Precision-fired refractory component essential for steelmaking, classified under HTS 6903.20.00.00.
High-Purity Alumina Ceramic Rod for Kilns
99.5% alumina ceramic rod used as support in high-temperature kilns and sintering furnaces. Fired refractory goods designed for structural support under extreme thermal conditions, HTS 6903.20.00.00.
Alumina Ceramic Retort for Chemical Processing
Fired alumina retort (>80% Al2O3) used for high-temperature chemical reactions and distillation. Refractory vessel withstands corrosive environments and thermal shock, classified HTS 6903.20.00.00.
Alumina-Silica Kiln Furniture Shelf
Refractory shelf made from 60% alumina-40% silica mixture for supporting ware in ceramic kilns. High-temperature fired ceramic designed for repeated thermal cycling, HTS 6903.20.00.00 classification.
High-Alumina Plug for Steel Ladle
Refractory alumina plug (75% Al2O3) used in steel ladle stopper assemblies for molten metal control. Precision-engineered and high-fired ceramic component, classified under HTS 6903.20.00.00.
Alumina Ceramic Support for Catalyst Bed
High-alumina ceramic support structures (>65% Al2O3) for industrial catalyst beds in petrochemical processing. Fired refractory goods providing structural integrity at elevated temperatures, HTS 6903.20.00.00.
Precision Alumina Ceramic Tube for Thermowells
High-precision 96% alumina ceramic tube for protecting temperature sensors in harsh industrial environments. Refractory fired construction for continuous high-temperature service, classified HTS 6903.20.00.00.