HS Code for Zinc dust

Zinc dust is classified under HS code 790310. This code is part of heading 7903, which covers zinc dust, powders, and flakes. The Harmonized System makes a technical distinction between 'dust' and 'powders/flakes.' According to the Explanatory Notes to Chapter 79, zinc dust (also known as blue powder) is obtained by the condensation of zinc vapor. This process results in very fine, spherical particles that are distinct from the particles found in zinc powders. The spherical nature of the dust particles is a key identifying characteristic for customs authorities. Zinc dust is primarily used in the manufacture of zinc-rich paints, as a reducing agent in chemical manufacturing, and in the purification of solutions for hydrometallurgy. Because of its high surface area and reactivity, it is treated differently than larger zinc particles or unwrought ingots. The classification 790310 is specific to this condensed form, whereas other forms of finely divided zinc fall under 790390.

Products Included

• Blue powder (condensed zinc vapor)
• Ultra-fine spherical zinc dust
• Zinc dust for protective coatings
• Zinc dust used in gold recovery (cyanidation)

Common Misclassification

Zinc dust is most commonly misclassified under HS code 790390, which covers zinc powders and flakes. The difference is the production method: 790390 is for powders produced by atomization or milling, which results in irregular or lamellar (flake-like) shapes, whereas 790310 is strictly for the spherical dust produced by condensation. Another misclassification occurs with 320649 (other coloring matter), where zinc-based pigments are sometimes placed. However, if the product is pure metallic zinc in dust form, Chapter 79 takes precedence over Chapter 32. Finally, it should not be confused with zinc oxide (281700), which is a white chemical compound rather than a metallic dust.

FAQ

What is the HS code for zinc dust?

The HS code for zinc dust is 790310.

What is the difference between zinc dust and zinc powder?

In the HS system, zinc dust (790310) is specifically produced by condensation and has spherical particles, while zinc powder (790390) is produced by other means like atomization and has different particle shapes.