Hydroxyphosphonoacetic acid solution (50% aqueous)

CAS No.

23783-26-8

Synonyms

HPAA; 2-Hydroxyphosphonoacetic acid; also listed as Hydroxyphosphonoacetic Acid (HPAA)

Molecular formula

C2H5O6P (HPAA)

Molecular weight

156.03 g/mol (HPAA)

Grade

Industrial grade

Packaging

HDPE bottle / HDPE drum
SKU FM-237 Category

Chemical Product Description & Applications

Hydroxyphosphonoacetic acid combines phosphonic-acid, hydroxyl and carboxylic-acid functionality in one molecule. It is used in industrial-water formulations for corrosion inhibition and metal-ion complexation. Interaction with metal-containing surfaces and compatible inhibitor components supports protective-film development in suitable cooling-water programs.

The selected material is an approximately 50% aqueous concentrate for further formulation. HPAA is particularly associated with corrosion-control packages and is often used with zinc salts or other complementary ingredients. This emphasis distinguishes it from additives selected mainly as stand-alone scale inhibitors. Its contribution depends on the balance of water chemistry, pH and the other treatment components, with dispersants or scale-control ingredients added for those separate tasks.

Typical Applications

  • Cooling-water corrosion-inhibitor packages: Used as an organic component in formulated programs intended to protect water-contact metal equipment from corrosion.
  • Zinc-containing treatment blends: Used in compatible formulations where HPAA and zinc-based components work together in the corrosion-control system.

Specifications

Parameter Specification Test Method
Appearance Colorless to pale yellow liquid Visual inspection
Identification Active-component fingerprint matches reference Chromatographic or spectroscopic reference comparison
Active acid 48.0-52.0% w/w Calibrated 31P NMR with internal standard
pH, 1% aqueous dilution at 25 C 2.0-3.0 Calibrated pH meter
Phosphorous acid ≤2.0% w/w Ion chromatography
Iron ≤10 mg/kg ICP-OES

Specifications describe the standard grade. Tolerance, test method and documentation package are confirmed per order.

Documents & Handling

Packaging

HDPE bottle / HDPE drum

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TDS

Technical Data Sheet

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SDS

Safety Data Sheet

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