Phosphorus Pentoxide-Derived Polyphosphoric Acid from Canada
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 — Canada → United States
10%
Rate breakdown
9903.03.0110%Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 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