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.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If dispersed in paint/varnish medium
Paints and varnishes containing pigments are classified by preparation, not components (Chapter note d).
If doped for semiconductor use and wafer-formed
Doped elements in disc/wafer form shift to prepared additives in 3818 per Chapter note.
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Import Tips & Compliance
• Include TEM/SEM analysis showing primary particle size <100nm for technical verification
• Comply with emerging nanomaterial reporting requirements in destination country
• Agglomeration state affects handling; declare both primary and bulk density
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.
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.
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 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.