High Purity P4S3 for Organic Synthesis from Mexico
99% pure phosphorus trisulfide crystals employed as a thionating agent converting carbonyls to thiocarbonyls in pharmaceutical intermediates. HTS 2813.90.50.00 classifies it as commercial 'other' nonmetal sulfide. Excluded from Chapter 29 as purely inorganic per legal notes.
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
• Provide HPLC purity certificate (>98%); use Schlenk line handling instructions in docs; segregate from oxidizers per DOT 49 CFR