Boric Acid and Sodium Tetraborate Hardening Agent from China
Dry blend of boric acid and sodium tetraborate (borax) used as a chemical hardener for inorganic foundry binders to accelerate setting time and improve mold strength. Classified in HTS 3824.99.39.90 for multi-inorganic compound preparations. Essential for no-bake foundry systems requiring rapid mold production.
Duty Rate — China → United States
37.5%
Rate breakdown
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)
9903.05.3112.5%Section 301 (forced labor) — additional 12.5% ad valorem on products of China
Import Tips
• Include boron content analysis for DOT hazardous material shipping; verify compatibility with specific silicate binders; maintain dry storage conditions to prevent premature reaction