Calcined Colemanite Borate Ore from China
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 — China → United States
37.5%
Rate breakdown
9903.05.3112.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of China, as provided for in U.S. note 52 to this subchapter
9903.88.0325%Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
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