Boric Acid and Sodium Tetraborate Hardening Agent from Japan
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 — Japan → United States
12.5%
Rate breakdown
9903.05.4912.5%Section 301 (forced labor) — Japan (col1 rate < 12.5 percent): MFN < 12.5% → total duty capped at 12.5%
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