Phosphorus Pentoxide-Derived Polyphosphoric Acid from Mexico
Polyphosphoric acid produced by dissolving diphosphorus pentoxide (P2O5) in phosphoric acid, forming chains of (HPO3)n. It is used in cyclization reactions and as a dehydrating agent, classified in HTS 2809.20.00.40 as polyphosphoric acids.
Duty Rate — Mexico → United States
10%
Rate breakdown
9903.05.5510%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.94, articles the product of Mexico, as provided for in U.S. note 52 to this subchapter
Import Tips
• Provide manufacturing process details or NMR spectra confirming polyphosphoric structure
• Store and ship in moisture-proof containers to prevent hydrolysis to orthophosphoric acid
• Label with exact H3PO4 equivalent percentage for CBP verification