Triphenyl Phosphine Sulfide from Canada
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 — Canada → United States
110%
Rate breakdown
9903.04.6093.5%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
9903.05.2910%Except for products described in headings 9903.05.85–9903.05.93, articles the product of Canada, as provided for in U.S. note 52 to this subchapter
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