Silicon Carbide Thermocouple Tube
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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If using siliceous earth binders
Kieselguhr or similar earth composition requires 6903.20, not general 'other'
If functioning as electrical insulator
Chapter exclusion sends ceramic electrical insulators to Chapter 85
If supplied as shaped refractory blocks
Basic refractory shapes like blocks go to 6902, mixed goods to 6903
Not sure which classification is right?
Our AI classifier can analyze your specific product and recommend the correct HTS code with confidence.
Import Tips & Compliance
• Certify SiC composition >90% with firing certificates; distinguish from graphite tubes via material specs; bundle with furnace documentation to prevent parts classification
Related Products under HTS 6903.90.00.50
Alumina Crucible
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
Zirconium oxide ceramic nozzle for continuous casting in steel mills, resisting molten metal erosion. Falls under HTS 6903.90.00.50 as other refractory ceramic goods, fired after shaping for high-temperature industrial use. Excludes non-fired or low-temp processed items per chapter notes.
Refractory Ceramic Slide Gate
High-alumina slide gate plates controlling molten steel flow in ladle casting. Classified in HTS 6903.90.00.50 as other refractory ceramic goods (slide gates specifically mentioned), fired after room-temp shaping from oxide materials.
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.
Refractory Kiln Plug
Cordierite ceramic plug sealing peepholes in pottery kilns, withstands thermal cycling. HTS 6903.90.00.50 for other refractory plugs, fired from clay-silica mixes.