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
13.7%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
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