Boron Trioxide (Boric Oxide) from Canada
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 — Canada → United States
13.7%
Rate breakdown
9903.05.2910%Section 301 (forced labor) — additional 10% ad valorem on products of Canada
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