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2-Hydroxy Phosphonoacetic Acid (HPAA)


Synonyms: HPAA, HPA, 2-Hydroxy Phosphonoacetic Acid
CAS No.: 23783-26-8
EC No.: 405-710-8
Molecular Weight: 156
Molecular Formula: C2H5O6P
Structural Formula: 2-Hydroxy Phosphonoacetic Acid (HPAA)
Physical & Chemical properties: HPAA is a pale yellow acidic liquid, easily chelating with di- and trivalent ion such as Fe2-, Mg2-, Ca2-, Ba2-, etc.


2-Hydroxy Phosphonoacetic Acid (HPAA) can be obtained by reaction between glyoxylic acid and phosphorus trichloride: C2H2O3+PCl3+3H2O→C2H5O6P+3HCl


2-Hydroxy Phosphonoacetic Acid (HPAA) is primarily used as scale inhibitor in water treatment, pipeline. It a) has the best corrosion inhibiting ability among phosphonates, suitable for high-corrosion water; b) is compatible with zinc salt; c) has good heat-stability, high temperature resistance is 200 deg.C d) contents lower phosphorus, lower impact on environment.


Items Specification
Appearance Dark brown liquid
Solid Content 50% min.
Phosphorous Acid (as PO3) 3.0% max.
pH Value (1% aqueous) 2.0 max.
Color, APHA 80 max.
Density( 20°C), g/cm3 1.30 min.

Standard Packaging

250kgs net/200L plastic drum; 1250kgs net/IBC; ISO Tank
Store in plastic, glass-lined container. Expiry: 12 month

200L drums for HPA

Risks and Safety Information

2-Hydroxy Phosphonoacetic Acid (HPAA) is regulated by UN as hazardous substance.
Danger! Corrosive Liquid, Organic, N.O.S.
UN 3265, Class 8, PG III
For more information, please see MSDS

Warning, Corrosive Liquid

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