Potassium Tungstate Crystals from Canada
Potassium tungstate (K2WO4) consists of large colorless crystals used in X-ray fluorescence standards and glass manufacturing. It is classified in HTS 2841.80.00 as a tungstate salt of an alkali metal base.
Duty Rate — Canada → United States
5.5%
Rate breakdown
9903.05.860%Universal product exemption (U.S. note 52(b))
Import Tips
• Include crystallographic data or XRD reports to prove chemically defined structure against mixture claims
• Package in moisture-proof containers; declare hygroscopic nature to prevent inspection damage
• For lab standards, attach NIST traceability certificates to expedite customs clearance