Ammonium Silicotungstate from Germany
Ammonium silicotungstate ((NH4)4SiW12O40) is a complex tungstate salt used in ion-exchange resins, analytical chemistry, and as a catalyst. As a complex salt containing both silicon and tungsten, it is classified as a tungstate under this tariff item, consistent with the chapter note on double or complex salts.
Duty Rate — Germany → Canada
0%
Import Tips
• Clearly document the chemical structure to show it is a complex tungstate rather than a silicate, as this affects classification
• If the product is used in ion-exchange applications, provide end-use documentation to support the tariff classification
• Consider requesting an advance ruling from the CBSA if there is any ambiguity about the complex salt classification