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.
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 supported on silica/alumina as finished catalyst
Prepared catalysts with chemical reaction-initiating properties go to 3815.
If blended with sulfuric acid
Acid mixtures for catalysis become preparations under 3824.
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Import Tips & Compliance
• Test for free phosphoric acid content (<15%) to confirm poly form
• Ship in bulk tankers with heating coils to maintain fluidity
• Declare CAS 37267-86-0 or equivalent for polyphosphoric acids
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.
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.