Uncalcined Borax Ore (Tincal) from Mexico
Tincal, or natural crude borax, is a sodium borate mineral concentrate extracted from evaporated lake deposits and used in metallurgy. It qualifies for HTS 2528.00.0005 as an uncalcined natural sodium borate concentrate from non-brine sources. This form is valued for its fluxing properties in welding.
Duty Rate — Mexico → United States
10%
Rate breakdown
9903.05.5510%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.94, articles the product of Mexico, as provided for in U.S. note 52 to this subchapter
Import Tips
• Require supplier certificates of analysis for B2O3 content; ensure proper ventilation during shipping due to fine dust hazards
• Avoid classification disputes by documenting lack of chemical purification