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.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If unwrought molybdenum metal
Base metals and their unwrought forms classified in Section XV (Chapter 81).
If as molybdate salts like ammonium paramolybdate
Salts of molybdic acid specifically in 2841, not oxides.
If in catalyst preparations with binders
Prepared catalysts or mixtures fall outside pure Chapter 28 compounds.
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Import Tips & Compliance
• Sintered or alloyed forms go to Chapter 81; import as pure powder with assay certificate
• Check Section VI notes for alloy exclusions; provide melting point data confirming oxide purity
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.
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.
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.