HS Code for Synthetic corundum

Synthetic corundum is classified under HS code 2818.10. This code falls within Chapter 28, which covers inorganic chemicals and precious metal compounds. Synthetic corundum, also known as artificial corundum, is a form of aluminum oxide (Al2O3) produced through industrial processes such as the fusion of bauxite in an electric arc furnace or the Verneuil process. It is characterized by its extreme hardness and high melting point, making it valuable for abrasive applications, refractories, and technical ceramics. The classification under 2818.10 is specific to artificial corundum, whether or not it is chemically defined. This distinguishes it from other forms of aluminum oxide or aluminum hydroxide found in subheading 2818.20 and 2818.30. The Harmonized System provides this specific code to track the trade of this industrially significant material, which is often traded in the form of grains, powders, or larger fused blocks. The classification is determined by GRI 1 and the specific chemical notes of Chapter 28, which include artificial corundum even if it contains impurities from the manufacturing process.

Products Included

• White fused alumina (synthetic corundum)
• Brown fused alumina
• Synthetic ruby or sapphire in bulk, unworked form
• Artificial corundum grains for abrasives
• Fused aluminum oxide for refractory bricks

Common Misclassification

A common misclassification occurs with HS code 7104.91 or 7104.99, which cover synthetic precious or semi-precious stones. If the synthetic corundum is cut, polished, or intended for jewelry, it moves to Chapter 71. Another error is using 2818.20, which is for aluminum oxide other than artificial corundum. Importers must distinguish between the fused crystalline structure of corundum and the standard calcined alumina.

FAQ

What is the HS code for synthetic corundum?

The HS code for synthetic (artificial) corundum is 2818.10.

Is synthetic corundum the same as aluminum oxide?

Yes, it is a specific crystalline form of aluminum oxide, but for HS purposes, artificial corundum (2818.10) is distinguished from other aluminum oxides (2818.20).