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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

100%

Rate breakdown

9903.04.6096.3%Pharmaceuticals Annex IV: patented pharma articles — 100% floor rate
9903.05.900%Articles already subject to Section 232 (steel/aluminum/copper + derivatives, autos + parts, wood, medium/heavy vehicles + parts, semiconductors, patented pharma) — U.S. note 52(f)

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)