Diphenylphosphinic Acid from China
Diphenylphosphinic acid (Ph2P(O)OH) features phosphorus bound to two phenyl carbons and oxygen functions. Falls under HTS 2931.49.00 as non-halogenated organo-phosphorus among other organo-inorganic compounds. Used in polymer flame retardants and coordination chemistry.
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
• Submit NMR spectra or GC-MS analysis confirming P-C bonding and non-halogenation
• For flame retardant use, prepare FIFRA statements if destined for pesticide production
• Watch for reclassification if salts formed—classified with acid per Chapter 29 note 3(C)(1)