Boron Trioxide (Boric Oxide) from Mexico
Boron trioxide (B₂O₃) is a pure inorganic oxygen compound of the nonmetal boron, used in glass manufacturing and as a flux. Classified in HTS 2811.29.5000 as an 'other' inorganic oxygen compound of nonmetals per Chapter 28 notes. It appears as a colorless glassy solid.
Duty Rate — Mexico → United States
13.7%
Rate breakdown
9903.03.0110%Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Import Tips
• Submit assay certificates proving >99% purity to distinguish from boric acid salts
• Include SDS for handling as irritant; DOT classification often matches UN 1560
• Avoid retail packaging that could reclassify under 2830 for borates