Alumina for Sapphire Crystal Growth
High-purity powder for Verneuil process sapphire (artificial corundum) growth, supplied as raw material. HTS 2818.20.00.00 before crystal formation.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If after grown into synthetic corundum gemstones
Synthetic precious stones in Chapter 71.
If optical elements from sapphire
Finished optical elements precedence.
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Import Tips & Compliance
• Classify powder form only; grown crystals become 7104
• 99.999% purity certificates essential
• Declare non-jewel end-uses like optics if applicable
Related Products under HTS 2818.20.00.00
Calcined Alumina Powder
High-purity calcined aluminum oxide (Al2O3) powder used in ceramic production and refractories. It is chemically defined as aluminum oxide but not processed into artificial corundum, distinguishing it from synthetic gem materials under HTS 2818.20.00.00.
Activated Alumina Desiccant
Porous aluminum oxide beads activated for moisture adsorption in gas drying and water purification. Classified under HTS 2818.20.00.00 as chemically defined aluminum oxide, excluding artificial corundum used for abrasives.
High-Purity Alumina for LEDs
Ultra-fine 99.99% pure aluminum oxide powder for LED substrate manufacturing and electronics ceramics. Falls under HTS 2818.20.00.00 as chemically defined Al2O3 other than artificial corundum.
Tabular Alumina for Refractories
Dense, tabular-shaped aluminum oxide grains produced by sintering for high-temperature refractory bricks. Classified in HTS 2818.20.00.00 as aluminum oxide distinct from artificial corundum abrasives.
Alpha Alumina Catalyst Support
Alpha-phase aluminum oxide spheres used as inert support for petroleum refining catalysts. HTS 2818.20.00.00 applies to this chemically defined compound other than artificial corundum.
Reactive Alumina for Ceramics
Fine reactive aluminum oxide powder with high sintering reactivity for technical ceramics. Falls under HTS 2818.20.00.00 as pure aluminum oxide, not artificial corundum.