Sodium Tungstate Borate Flux Mixture from Japan
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 — Japan → United States
12.5%
Rate breakdown
9903.05.4912.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of Japan, with an ad valorem (or ad valorem equivalent) rate of duty under column 1 less than 12.5 percent, 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