Tributylphosphine Sulfide from Mexico
Tributylphosphine sulfide is an organo-sulfur-phosphorus compound used as a ligand precursor and polymer stabilizer. Classifies under HTS 2930.90.92.51 as other organo-sulfur with P-S-C connectivity. Stable white solid for catalysis applications.
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
• 31P NMR spectrum verifies structure (δ ~50 ppm)
• Air-stable unlike parent phosphine; simplified shipping
• Phosphorus content declaration required for waste treatment compliance