Boron Trioxide (Boric Oxide) from China
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 — China → United States
38.7%
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
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
• 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