Ceramic Bushing Support
Recrystallized alumina supports holding heating element bushings in high-temp electric furnaces. Refractory ceramic goods (supports named) in HTS 6903.90.00.50.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If kieselguhr insulation grade
Siliceous earth supports specifically to 6903.20
If insulating fitting function
Chapter exclusion for ceramic electrical insulators/fittings
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Import Tips & Compliance
• Electrical isolation test data despite exclusion note; OEM specifications; volume-based duty savings
Related Products under HTS 6903.90.00.50
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High-purity alumina ceramic crucible used for melting and holding metals or chemicals at high temperatures in laboratory furnaces. Classified under HTS 6903.90.00.50 as a refractory ceramic good designed for extreme heat resistance, fired after shaping from inorganic nonmetallic materials. Meets chapter requirements for refractory applications beyond basic bricks.
Zirconia Nozzle
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Hexagonal silicon carbide tube sheathing thermocouples in kilns and furnaces up to 1600°C. HTS 6903.90.00.50 covers this refractory ceramic tube, fired from nonmetallic carbides, excluding electrical insulators. Essential for industrial heat measurement protection.
Refractory Ceramic Slide Gate
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Magnesium Oxide Crucible
MgO ceramic crucible for rare earth metal melting, offering superior corrosion resistance. HTS 6903.90.00.50 applies to this fired refractory oxide vessel, distinct from basic brick forms.
Ceramic Retort Tube
Fired mullite ceramic retort tube for gas purification processes at elevated temperatures. Specifically listed under HTS 6903.90.00.50 as refractory ceramic goods for chemical reactions.