Tungsten Blue Oxide (W20O58)
Tungsten blue oxide, a mixed-valence WO2.9 equivalent (W20O58), used as APT reduction intermediate for tungsten carbide production. Classified in HTS 2825.90.30.00 as it qualifies as chemically defined tungsten oxides per subheading note. Widely traded form in the tungsten supply chain.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If processed into tungsten carbide powder
Carbides are specifically classified in 2849; the chemical transformation from oxide changes heading.
If selenites/tungstates rather than oxides
Complex salts containing tungsten fall under 2833; only pure oxides stay in 2825.
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Import Tips & Compliance
• Specify exact stoichiometry (W20O58) and reduction equivalent on invoice to match statistical reporting
• Monitor tungsten quota restrictions; obtain import licenses if applicable for strategic materials
• Test for moisture content as it affects weight declaration and duty calculation
Related Products under HTS 2825.90.30.00
Tungsten Trioxide Powder (WO3)
Tungsten trioxide (WO3) is a yellow-green powder used primarily in the production of tungsten metal and as a catalyst in chemical processes. It falls under HTS 2825.90.30.00 as a chemically defined tungsten oxide, distinct from other metal oxides. This pure inorganic compound meets Chapter 28 criteria for classification as a metal oxide.
Tungsten(VI) Oxide Granules
Granular form of WO3 used in gas sensor manufacturing and electrochromic devices. Classified under HTS 2825.90.30.00 as it is a specific tungsten oxide meeting inorganic base oxide definitions. The granular physical form does not change its chemical classification.
Ditungsten Trioxide (W2O3) Technical Grade
Technical grade ditungsten trioxide used in alloy production and high-temperature ceramics. Falls under HTS 2825.90.30.00 as a defined tungsten oxide compound per Chapter 28 specifications. Excluded from other chapters due to its inorganic metal oxide nature.
Monoclinic Tungsten Trioxide Crystals
Synthetic monoclinic WO3 crystals grown for research and thin-film deposition in photochromic applications. HTS 2825.90.30.00 applies as cultured inorganic crystals of metal oxides, excluded from optical elements unless finished. Meets 'chemically defined' criteria.
Tungsten Dioxide (WO2) Nanopowder
WO2 nanoparticles used in infrared shielding coatings and gas sensing elements. Classified under HTS 2825.90.30.00 as tungsten oxides regardless of particle size, per chemical definition. Nanotechnology form doesn't alter inorganic compound classification.
Tungsten Trioxide Hydrate (Yellow Tungstic Acid)
Hydrated WO3, known as yellow tungstic acid (5WO3·H2O), used in catalyst impregnation. Falls under HTS 2825.90.30.00 as tungsten oxides; hydrates of metal oxides remain classified as oxides, not acids unless specified otherwise. Common intermediate in refining.