Calcined Colemanite Borate Concentrate from Japan
Calcined colemanite is a naturally occurring calcium borate mineral concentrate processed by heating to remove water, used primarily in glass and ceramic manufacturing. It falls under HTS 2528.00.0050 as a calcined natural borate concentrate with less than 85% H3BO3 content on dry weight, excluding borates from brine. This classification covers unrefined mineral forms not chemically separated.
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
• Verify H3BO3 content via lab analysis to confirm under 85% threshold; obtain mineral origin certificates to distinguish from synthetic borates
• Ensure proper packaging to prevent moisture reabsorption during shipping