Tungsten Blue Oxide (W20O58) from China
Tungsten blue oxide (W20O58) is a mixed-valence tungsten oxide used as an intermediate in the production of ammonium paratungstate (APT) and tungsten carbide. It is a chemically defined inorganic oxide of tungsten, falling under tariff item 2825.90.00 as 'Other' metal oxides. The product is not excluded by Chapter 28 notes, as it is a separate chemically defined compound of an inorganic base.
Duty Rate — China → Canada
Import Tips
• Ensure the product is clearly labelled as tungsten blue oxide (W20O58) with a certificate of analysis confirming its chemical composition
• Verify the applicable duty rate for tariff item 2825.90.00 with the CBSA, as rates may vary based on origin (e.g
• Most-Favoured-Nation or free trade agreements)
• Keep records of the import transaction for at least six years for CBSA audit purposes