Phosphonous Acid Bis(2,4-di-tert-butylphenyl) Ester Derivative from Mexico
Technical-grade phosphonous acid derivative matching 4,4'-diphenylbisphosphonous acid di(2',2",4',4"-di-tert-butyl)phenyl ester specification, used in nylon and engineering plastics stabilization. HTS 2931.90.10.00 covers this exact aromatic organo-inorganic structure with direct P-C bonds.
Duty Rate — Mexico → United States
16.5%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
Import Tips
• Label with GHS hazard pictograms and UN numbers for proper hazmat declaration
• Verify >99% assay via HPLC; lower purity risks 2931.90.90.00 or 3824 classification