Anhydrous Boric Oxide Powder from Mexico
Anhydrous boric oxide (B2O3) is a white, glassy powder used in the production of borosilicate glass and as a flux in metallurgy. It falls under HTS 2810.00.00.00 as an oxide of boron, chemically defined as a pure inorganic compound of boron and oxygen. This high-purity form is essential for optical glass manufacturing.
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
• Verify purity levels exceed 99% to confirm classification as chemically defined oxide under Chapter 28 notes
• Provide chemical analysis certificates to avoid misclassification as boric acid or industrial mixtures
• Ensure packaging prevents moisture absorption, as hydration could reclassify it as boric acid