Sodium Tungstate Borate Flux Mixture from Canada
A fused mixture of sodium tungstate and borates used as soldering flux in electronics and metal joining. Enhances wetting and corrosion resistance in high-temperature applications. Under 3824.99.3500 for inorganic tungsten compound mixtures.
Duty Rate — Canada → United States
16.5%
Rate breakdown
9903.05.2910%Except for products described in headings 9903.05.85–9903.05.93, articles the product of Canada, as provided for in U.S. note 52 to this subchapter
Import Tips
• Include flux activation temperature specs to confirm industrial chemical use
• TSCA registration required for new tungsten-borate formulations entering US commerce
• Separate from welding preparations to prevent reclassification under 3810