Zinc Phosphate Dihydrate from United States
Zinc phosphate dihydrate (Zn3(PO4)2·2H2O) is a fine white powder used as a corrosion inhibitor in metal primers and as a component of dental cements. It is a chemically defined zinc salt of phosphoric acid, falling under the 'other phosphates' provision of tariff item 2835.29.00. The product is not a polyphosphate or a phosphonate, so it is correctly classified here.
Duty Rate — United States → Canada
Import Tips
• Ensure the product is clearly labelled as chemically defined zinc phosphate dihydrate with the CAS number (7779-90-0) on the commercial invoice to support classification
• Verify the MFN duty rate for tariff item 2835.29.00, as rates can change; check the CBSA tariff browser before shipping
• If the powder is mixed with other substances (e.g
• pigments or fillers), it may no longer qualify as a separate chemically defined compound, so confirm the composition with your supplier