Technical Grade Dibutyltin Oxide from Mexico
Technical grade dibutyltin oxide (95-98% purity) for industrial silicone curing applications. HTS 2931.90.90.21 classification applies to this organo-inorganic tin compound despite minor impurities, as it remains a separate chemically defined compound under Chapter 29 note (a).
Duty Rate — Mexico → United States
110%
Rate breakdown
9903.04.6096.3%Except as provided in heading 9903.04.61, patented pharmaceutical articles as provided for in subdivisions (c) and (d) of U.S. note 40 to this subchapter
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
• Document impurity profile; levels must not render it a mixture under Chapter 29 exclusion notes
• Obtain end-user statements if transshipping to confirm non-consumer direct use (TSCA requirements)
• Use anti-caking stabilized packaging only if necessary for transport per Chapter 29 note (f)