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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If containing siliceous fossil earths
Specific exclusion for kieselguhr-based refractories shifts from 'other' category
If used as decorative lab porcelain ware
Porcelain lab articles with <0.5% water absorption move to tableware/laboratory chapter
If imported as assembled furnace component
Refractory parts integral to machinery classified with the complete article in Chapter 84
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Import Tips & Compliance
• Include thermal shock resistance test data proving >800°C firing; declare exact zirconia content to avoid porcelain misclassification; check for anti-dumping duties on Chinese-origin refractories
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.
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.
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.