Technical Grade Potassium Stannate from Japan
Technical grade potassium stannate is a commercial powder (typically 40-60% K2SnO3) for immersion tin plating in electronics manufacturing. It qualifies for HTS 2841.90.30.00 as the designated potassium salt of stannic acid, despite minor impurities allowed in technical grades. Used to create uniform tin layers on copper for solderability.
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
• Specify minimum stannate content (e.g
• 40%) in commercial invoice; test for heavy metals per REACH/TSCA
• Avoid: classifying as 'mixtures' without predominance proof