Tungsten|HTS Code

Tungsten harmonized system code

Product Overview Tungsten (wolfram) classified under HTSUS 8101.94 refers to primarily elemental tungsten in forms not elsewhere specified within heading 8101 — principally powders, granules and certain prepared forms used as feedstock or intermediate articles. Key characteristics include elemental composition (W) with typical purities of 99.5–99.95% for metal powders, bulk density ~19.25 g/cm3, melting point 3,422 °C, and particle-size distributions commonly specified from <1 µm up to 100 µm depending on atomization or reduction process. Processing levels range from ammonium paratungstate (APT) conversion to reduced metal powder, hydrogen-reduced sponge, atomized or spheroidized powders, and sintered blanks or preforms; quality attributes include chemical assay (W%, O, C, N, H in ppm), particle-size distribution (D10/D50/D90), specific surface area (m2/g) and tap/bulk density. Product classifications within 8101.94 are typically declared by physical form and processing — e.g., metal powders (atomized, milled), granules, spheroidized powders, and certain sintered intermediates — and commercial applications include tungsten carbide manufacture, heavy alloy parts, electrical contacts, radiation targets, and high-temperature tooling and aerospace components. HTS Code Classification & Trade Specifications Full 6‑digit HTS structure for this material is: Chapter 81 (Other base metals), Heading 8101 (Tungsten and articles thereof), Subheading 8101.94 (elemental tungsten in specified forms not covered elsewhere). Classification rationale: goods qualify under 8101.94 when chemical composition is predominantly tungsten and the form corresponds to powders, granules or prepared metal intermediates as described in the Harmonized System notes; alternate subheadings apply for unwrought tungsten bars/rods or scrap. Trade considerations for US customs duty calculation and logistics include typical packaging (sealed steel or fiber drums, inner liners, moisture-barrier bags, labelled palletized units), preservation (desiccants, inert-gas flush or vacuum-seal for high‑purity grades), and transport requirements (generally non‑dangerous goods unless alloying additives or contaminants create hazards — verify MSDS/UN classification). Quality standards for customs and compliance documentation should state measurable attributes (purity %, particle-size D50, oxygen ppm, density), applicable ASTM/ISO test methods, and any export control classifications or licensing requirements relevant to alloy content or military end‑use.

Tungsten Chapter Note