Metaboric Acid Powder from Mexico
Metaboric acid (HBO2), a dehydrated form of boric acid, used in flame retardants and catalysts. Included under HTS 2810.00.00.00 as a boric acid isomer, chemically defined. Less stable than orthoboric acid, requiring dry storage.
Duty Rate — Mexico → United States
11.5%
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
• Specify polymorphic form (alpha/beta/gamma) in documentation
• Monitor for reconversion to orthoboric acid during storage