What is Hydroxyphosphonoacetic Acid HPAA CAS 23783-26-8?

Hydroxyphosphonoacetic Acid, commonly called HPAA or 2-hydroxyphosphonoacetic acid, is a phosphonate-based water treatment chemical with CAS 23783-26-8 and molecular formula C2H5O6P. It is primarily used as a corrosion inhibitor for mild steel in industrial water systems.

What is HPAA mainly used for?

HPAA is mainly used in circulating cooling water treatment and related industrial water treatment formulations. Its primary role is mild steel corrosion inhibition, and it can also contribute to scale control when used in suitable phosphonate or polymer treatment programs.

What is the common supply form and concentration of HPAA?

Commercial HPAA is commonly supplied as a dark amber to dark umber liquid aqueous solution, often around 50% active content. The exact concentration, color, pH, density, and solids can vary by grade, so these values should be confirmed against the selected specification.

What pH and formulation factors should be checked for HPAA?

HPAA is acidic and water-miscible; a 1% aqueous solution is typically acidic, often specified around pH 2.0-3.0 depending on the source. For cooling-water programs, it is commonly evaluated with other phosphonates, polymers, and zinc salt where compatible, and final dosage should be based on water chemistry and performance testing.

How is HPAA different from HEDP, PBTC, or ATMP?

These are all phosphonate water-treatment chemicals, but HPAA is especially positioned as a mild steel corrosion inhibitor rather than a broad antiscalant. HEDP, PBTC, and ATMP have different structures and performance profiles, so the selection should be based on the target water system, metallurgy, and formulation requirements.

Hydroxyphosphonoacetic Acid HPAA CAS 23783-26-8

Hydroxyphosphonoacetic Acid, commonly known as HPAA, is a phosphonate-based water treatment chemical used in industrial water treatment formulations. It is mainly applied as a corrosion inhibitor for mild steel and is also used in scale control programs for circulating cooling water and related systems. PBTC is a related phosphonate option where high-temperature scale control is required. Commercial supply is commonly available as a 50% aqueous solution for industrial formulation use.

CAS: 23783-26-8
Synonyms: HPAA; HPA; Hydroxyphosphonoacetic Acid; 2-Hydroxy Phosphonoacetic Acid
Molecular Formula: C2H5O6P
Grade: Industrial Grade / Water Treatment Grade
Package: Standard export packaging available according to supply specification and order quantity. Commercial supply is commonly offered in drum or IBC formats depending on concentration and shipment arrangement.

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Product Description

1 Physicochemical Properties

2 Typical Applications

3 Product Function

4 Typical Supply Form

5 Packaging

6 Storage

Physicochemical Properties

Item	Description
Appearance	Dark amber to dark umber transparent liquid
Product Type	Phosphonate-based water treatment chemical
CAS No.	23783-26-8
Molecular Formula	C2H5O6P
Molecular Weight	156.0
Active Form	Commonly supplied as 50% aqueous solution
pH (1% solution)	Acidic; specification-dependent
Density	Specification-dependent for commercial solution grade
Main Functions	Corrosion inhibition, scale control, and formulation support in industrial water treatment systems

Typical Applications

Circulating cooling water treatment systems
Mild steel corrosion inhibition programs
Industrial scale and corrosion control formulations
Water treatment formulations requiring phosphonate-based performance support

Product Function

HPAA is mainly used as a corrosion inhibitor in industrial water treatment systems. It is commonly selected for circulating cooling water formulations and can also contribute to scale control performance in suitable treatment programs.

Typical Supply Form

Hydroxyphosphonoacetic Acid is commonly supplied as a liquid aqueous solution for easier handling and formulation use. The exact concentration and technical specification should be confirmed according to the supplied grade.

For related phosphonate water-treatment pages, review HEDP, PBTC, and ATMP.

Packaging

Standard export packaging can be arranged according to order quantity and supply specification. Regular industrial shipment can be provided in suitable containers for liquid chemical transport.

Storage

Store in a cool, dry, and well-ventilated place in tightly closed original packaging. Keep away from incompatible materials and protect the container from damage during storage and transport. Follow the applicable SDS and handling instructions for the supplied grade.

FAQ - Technical & Supply Chain

Q:
What is Hydroxyphosphonoacetic Acid HPAA CAS 23783-26-8?

A: Hydroxyphosphonoacetic Acid, commonly called HPAA or 2-hydroxyphosphonoacetic acid, is a phosphonate-based water treatment chemical with CAS 23783-26-8 and molecular formula C2H5O6P. It is primarily used as a corrosion inhibitor for mild steel in industrial water systems.
Q:
What is HPAA mainly used for?

A: HPAA is mainly used in circulating cooling water treatment and related industrial water treatment formulations. Its primary role is mild steel corrosion inhibition, and it can also contribute to scale control when used in suitable phosphonate or polymer treatment programs.
Q:
What is the common supply form and concentration of HPAA?

A: Commercial HPAA is commonly supplied as a dark amber to dark umber liquid aqueous solution, often around 50% active content. The exact concentration, color, pH, density, and solids can vary by grade, so these values should be confirmed against the selected specification.
Q:
What pH and formulation factors should be checked for HPAA?

A: HPAA is acidic and water-miscible; a 1% aqueous solution is typically acidic, often specified around pH 2.0-3.0 depending on the source. For cooling-water programs, it is commonly evaluated with other phosphonates, polymers, and zinc salt where compatible, and final dosage should be based on water chemistry and performance testing.
Q:
How is HPAA different from HEDP, PBTC, or ATMP?

A: These are all phosphonate water-treatment chemicals, but HPAA is especially positioned as a mild steel corrosion inhibitor rather than a broad antiscalant. HEDP, PBTC, and ATMP have different structures and performance profiles, so the selection should be based on the target water system, metallurgy, and formulation requirements.

Ordering & Documentation

Key information for document requests, quotations, and supply planning.

Documents

COA, TDS, SDS/MSDS and packing details are available on request.

Quotation

Send the CAS number, grade, quantity, packing preference and destination.

Sample & Supply

Support is available for samples, trial orders, bulk and repeat supply.

Storage & Shipping

Product-specific conditions are confirmed before order.

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