Tungsten Trioxide Powder
Tungsten trioxide (WO3) is a yellow-green powder used in gas sensors, smart windows, and catalysts. Classified in HTS 2825.90.90.00 as an other metal oxide of tungsten. It qualifies as a chemically defined inorganic compound per Chapter 28 Note 1.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If in unwrought metal form rather than oxide
Pure tungsten metal falls in Chapter 81; only oxides stay in Chapter 28.
If for tungsten carbide, not trioxide
Carbides specifically classified in 2849 per chapter notes, excluding other carbon compounds.
If doped for electronic applications in wafer form
Doped elements cut into discs/wafers move to 3818 per chapter note on electronic forms.
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Import Tips & Compliance
• Provide certificates of analysis confirming WO3 content >99% to avoid reclassification as alloy or waste
• Comply with TSCA regulations; include end-use declaration to prevent diversion to defense applications
Related Products under HTS 2825.90.90.00
Niobium Pentoxide
Niobium pentoxide (Nb2O5) is a white powder used in capacitors, superconductors, and optical glass. Imported under HTS 2825.90.90.00 as other metal oxides of niobium (columbium). Chemically defined per Chapter 28.
Tantalum Pentoxide
Tantalum pentoxide (Ta2O5) powder used in electronic capacitors and high-K dielectrics. Classifies in HTS 2825.90.90.00 as other metal oxide. Inorganic compound of rare metal tantalum.
Vanadium Pentoxide
Vanadium pentoxide (V2O5) is a yellow-orange powder used as a catalyst in sulfuric acid production. Falls under HTS 2825.90.90.00 as other metal oxides. Catalytically active metal oxide.
Antimony Trioxide
Antimony trioxide (Sb2O3) is a white crystalline powder used as a flame retardant in plastics and textiles. It falls under HTS 2825.90.90.00 as an 'other' metal oxide not specifically provided for elsewhere in heading 2825. This inorganic compound of the metal antimony is chemically defined and meets Chapter 28 criteria.
Zinc Peroxide
Zinc peroxide (ZnO2) is a white powder used as an antiseptic, bleaching agent, and in rubber vulcanization. It is imported under HTS 2825.90.90.00 as other metal peroxides not elsewhere specified. This fits as a chemically defined peroxide of the metal zinc.
Molybdenum Trioxide
Molybdenum trioxide (MoO3) is a white to violet powder used in alloy production and as a catalyst. Falls under HTS 2825.90.90.00 as other metal oxides. Chemically defined inorganic base metal oxide per Chapter 28.