HS Code 79.03 – Zinc; dust, powders and flakes

HS code 7903 is a 4-digit heading in the Harmonized System that covers: Zinc; dust, powders and flakes. Heading 7903 covers zinc in the form of dust, powders, and flakes, representing fine particulate forms of elemental zinc. This classification is crucial for industries requiring zinc in a high surface area form for various chemical and metallurgical applications. Zinc dust typically refers to very fine particles obtained by condensation of zinc vapor, while powders are usually produced by atomization or electrolysis, and flakes by specialized milling processes. The scope includes both pure zinc and zinc alloy powders/flakes where zinc predominates by weight. These forms are distinct from solid, unwrought zinc (7901) or waste/scrap (7902) due to their physical state and specialized manufacturing methods. The classification matters significantly for trade compliance because the fineness, purity, and specific form (dust, powder, or flake) can influence tariff rates, safety regulations (due to flammability), and end-use restrictions. Historically, zinc dust has been used as a reducing agent and in anti-corrosion paints, while modern applications have expanded to include advanced materials, batteries, and chemical synthesis. This heading is integral to Chapter 79 by providing processed, high-value forms of zinc essential for diverse industrial sectors, bridging the gap between raw zinc and complex manufactured articles.

Zinc dust for paints, zinc powder for chemical synthesis, zinc flakes for anti-corrosion coatings, atomized zinc powder, electrolytic zinc powder for batteries, zinc powder for friction materials, zinc powder for metallurgical applications, zinc dust for galvanizing, zinc powder for pharmaceutical precursors, zinc powder for pyrotechnics, zinc powder for sacrificial anodes, zinc powder for catalysts, zinc powder for rubber vulcanization, spherical zinc powder, dendritic zinc powder, ultra-fine zinc powder, zinc powder for additive manufacturing, zinc powder for brazing, zinc powder for thermal spraying, zinc powder for cementation, zinc powder for pigment production, zinc powder for lubricants, zinc powder for dental amalgams (historic), zinc powder for anti-fouling paints.

A common mistake is confusing zinc dust, powders, or flakes (7903) with zinc pigments (3206) if the material has been treated or compounded to function specifically as a pigment, or with zinc compounds (e.e., 2830 for zinc sulfides, 2835 for zinc phosphides) if it's not elemental zinc. Another error involves misclassifying very coarse granular zinc as powder instead of unwrought zinc (7901), which applies to more rudimentary forms. The key distinction lies in the elemental nature of the zinc and its physical form (dust, powder, or flake) without significant chemical modification or formulation for specific pigmentary uses.

In 2025, the top exporters of HS code 7903 in UN Comtrade data were Belgium ($99M, 20% of world exports), Germany ($55M) and South Korea ($45M). World exports came to about $498M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.

In 2025, the top importers of HS code 7903 in UN Comtrade data were the United States ($55M, 11% of world imports), Poland ($38M) and France ($33M). World imports came to about $483M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.

HS code 7903 is a 4-digit heading under Chapter 79 of the Harmonized System. The first 2 digits (79) identify the chapter, and digits 3-4 (03) specify the heading. This code contains multiple 6-digit subheadings for precise product classification.