Perfluoroisobutene (PFIB) from China
Perfluoroisobutene used as chemical intermediate despite high toxicity requiring special handling. HTS 2903.59.90.00 classification as branched unsaturated fluorinated acyclic hydrocarbon. Chapter 29 note (g) permits safety identification additives.
Duty Rate — China → United States
16.2%
Rate breakdown
9903.05.3112.5%Section 301 (forced labor) — additional 12.5% ad valorem on products of China
Import Tips
• Require DEA Schedule 1 chemical controls and end-user verification
• Use specialized PFIB-rated regulators with fluoropolymer diaphragms
• Include LC50 mammalian inhalation toxicity data (<0.02 ppm/4h)