Triphenyl Phosphine Sulfide from Mexico
Triphenyl phosphine sulfide ((C6H5)3P=S) contains three aromatic phenyl groups with phosphorus-sulfur functionality, qualifying as aromatic organo-sulfur under HTS 2930.90.2900. Used as ligand in catalysis and polymer synthesis. Chapter notes confirm organo-sulfur with nonmetal directly linked to carbon.
Duty Rate — Mexico → United States
16.5%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
Import Tips
• Molecular structure verification critical due to potential phosphine (not sulfur) classification debate
• Air-stable but provide P/S ratio analysis to confirm sulfide vs oxide forms
• Not for Chapter 28 phosphorus compounds per chapter exclusion notes