Alumina Silicate and Borax Flux Mixture from Mexico
Fused mixture of alumina silicate and borax (sodium tetraborate) used as a binder flux in ceramic shell foundry cores. HTS 3824.99.39 covers this inorganic compound blend specifically prepared for high-temperature foundry bonding applications. Enhances thermal shock resistance.
Duty Rate — Mexico → United States
10%
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
• Specify fusion temperature and borax/silicate ratio in technical specs; test boron content for REACH compliance if transshipping through EU; label as 'not for food contact.'