Tributylphosphine Sulfide from Mexico
Tributylphosphine sulfide ((C4H9)3P=S) contains phosphorus-sulfur with organic groups, classified as organo-sulfur compound in 2930.90.92. Used as ligand in catalysis and polymer chemistry.
Duty Rate — Mexico → United States
3.7%
Rate breakdown
9903.03.030%Articles the product of any country, as provided for in subdivision (aa)(ii) of U.S. note 2 to this subchapter
Import Tips
• Molecular structure diagram essential to document P=S classification under heading 2930
• Air-sensitive; inert atmosphere packaging documentation required
• Distinguish from pure phosphines (2931.00) via sulfur content analysis