Phosphorus Pentoxide-Derived Polyphosphoric Acid
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.
Import Duty Rates by Country of Origin
| Origin Country | MFN Rate | Ch.99 Surcharges | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | Free | +35.0% | 35% |
| 🇲🇽Mexico | Free | +10.0% | 10% |
| 🇨🇦Canada | Free | +10.0% | 10% |
| 🇩🇪Germany | Free | +10.0% | 10% |
| 🇯🇵Japan | Free | +10.0% | 10% |
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If pure P2O5 without hydration to polyacid
Diphosphorus pentaoxide (anhydride form) is classified separately from its hydrated polyacids.
If diluted below purity threshold for chemically defined
Less pure forms may be seen as mixtures or preparations under 3824.
If for linear polyphosphates as salts
Sodium or potassium polyphosphates (e.g., for water treatment) are in 2835.
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Import Tips & Compliance
• 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
Related Products under HTS 2809.20.00.40
Polyphosphoric Acid 115%
Polyphosphoric acid with approximately 115% H3PO4 equivalent, a viscous, colorless to yellow liquid used primarily as a phosphorylating agent in organic synthesis. It falls under HTS 2809.20.00.40 as a chemically defined polyphosphoric acid, distinguished from monophosphoric acid by its polymeric structure and higher phosphorus oxide content.
Polyphosphoric Acid 83-85% P2O5
A superphosphoric acid containing 83-85% P2O5, used in the production of phosphate esters and as a catalyst in polymerization reactions. Classified under HTS 2809.20.00.40 due to its polyphosphoric composition exceeding standard orthophosphoric acid.
High-Purity Polyphosphoric Acid for Semiconductor Etching
Ultra-pure polyphosphoric acid (99%+), free of metallic impurities, used in microelectronics for wafer etching and doping. Falls under HTS 2809.20.00.40 as a chemically defined polyphosphoric acid per Chapter 28 notes.
Polyphosphoric Acid 105% for Flame Retardant Synthesis
Polyphosphoric acid at 105% H3PO4 strength, employed in manufacturing ammonium polyphosphate flame retardants. Classified under HTS 2809.20.00.40 for its polymeric phosphoric acid structure.
Industrial Polyphosphoric Acid for Polymer Catalysts
Viscous polyphosphoric acid used as a catalyst in alkylation and polyester production, with extended phosphate chains. It is a chemically defined compound under HTS 2809.20.00.40.