Calcined Colemanite Borate Ore from Japan
Colemanite is a naturally occurring calcium borate mineral mined primarily in Turkey, calcined to remove moisture while preserving its borate content. It falls under HTS 2528.00.00 as a natural borate concentrate, not separated from brine, used mainly in glass and ceramic production. The calcination process is explicitly allowed without changing its classification.
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 borate content via assay certificates to confirm <85% H3BO3 for natural boric acid variants and ensure no brine separation
• Obtain mining origin documentation as many suppliers are from Turkey; check for calcination process records to avoid misclassification