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.
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 equivalent to 85% or less H3PO4 and not highly polymerized
Simpler phosphoric acid (orthophosphoric) without significant polyphosphate chains falls under the phosphoric acid subheading.
If formulated as a salt like sodium hexametaphosphate
Phosphates and polyphosphates of metals or ammonium are classified in heading 2835, not free acids.
If mixed with organic solvents or sold as reaction mixture
Mixtures of inorganic acids with organic substances may be treated as chemical preparations rather than pure compounds.
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Import Tips & Compliance
• Verify purity and P2O5 content via certificate of analysis to confirm classification under polyphosphoric acids, not simple phosphoric acid
• Ensure UN-approved packaging (e.g
• IBCs with corrosion-resistant liners) and proper Hazmat documentation (UN1805, Class 8)
• Avoid misclassification as fertilizer-grade phosphoric acid; provide lab specs showing polymeric structure
Related Products under HTS 2809.20.00.40
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.
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.
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.