What is Hydrolyzed Polymaleic Anhydride CAS 26099-09-2?

Hydrolyzed polymaleic anhydride, or HPMA, is a carboxylic-acid polymer supplied as a 50% aqueous solution. It is used as an antiscalant and dispersant in water-treatment systems, especially where high temperature and alkalinity are present.

How does HPMA compare with polyacrylic acid antiscalants?

HPMA contains a high density of carboxylic-acid groups on a polymaleic backbone. It often retains scale-inhibition and dispersion performance at higher temperatures and alkalinity than many conventional polyacrylates, making it suitable for demanding cooling and boiler systems.

Which scale types does HPMA control?

It is used to inhibit calcium carbonate, calcium sulfate, barium sulfate and calcium phosphate scale, and it can also disperse suspended solids, iron oxides and other deposits in circulating water.

What are the main applications?

Typical applications include open and closed cooling-water treatment, boiler-water treatment, reverse-osmosis scale control, oilfield produced-water treatment, seawater desalination and industrial process-water systems.

Why is high-temperature tolerance important?

In boilers and high-heat-flux systems, antiscalants can degrade or lose performance. HPMA is selected because its polymaleic structure helps maintain efficacy under elevated temperature and alkalinity, reducing deposition on heat-transfer surfaces.

Which grade and packaging does this listing cover?

The listing is industrial-grade 50% aqueous solution for water treatment. It is available in 25 kg or 250 kg HDPE drums and 1,000 L IBC tanks, with bulk packaging on request.

What specifications should be confirmed before ordering?

Confirm solids or active-polymer content, pH, viscosity, density, residual monomer, iron and any application-specific performance data. Request the batch analysis, technical data and safety information before purchase.

How should HPMA solution be stored and handled?

Store in closed HDPE or compatible containers in a cool, dry, ventilated area away from strong oxidizers and incompatible materials. Avoid freezing and excessive heat, use chemical-resistant gloves and eye protection, and follow the safety information.

Hydrolyzed Polymaleic Anhydride (HPMA) CAS 26099-09-2

Hydrolyzed Polymaleic Anhydride (HPMA), CAS 26099-09-2, is a phosphorus-free, low-molecular-weight polycarboxylic polymer supplied as a 50% aqueous solution for scale inhibition and dispersion in cooling water, boiler water, desalination and oilfield water systems. Confirm the required grade, then request a quotation with COA/TDS/SDS for bulk supply.

CAS: 26099-09-2
Synonyms: HPMA, Polymaleic acid, Maleic acid homopolymer, PMA, Poly(maleic anhydride) hydrolyzed
Einecs: 607-861-7
Molecular Formula: (C₄H₄O₄)ₙ
Grade: Industrial grade, 50% aqueous solution for water treatment
Package: 25 kg / 250 kg HDPE drums 1,000 L IBC tanks Bulk packaging available on request

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Product Description

Hydrolyzed Polymaleic Anhydride, CAS 26099-09-2, also known as polymaleic acid or HPMA, is a low-molecular-weight polycarboxylic polymer based on maleic anhydride; the EC/EINECS number is 607-861-7.

Synonyms: HPMA; polymaleic acid; maleic acid homopolymer; PMA; hydrolyzed poly(maleic anhydride).

CAS: 26099-09-2.

Molecular formula (repeat unit): (C₄H₄O₄)ₙ.

Average molecular weight: 400–800.

EC number: 607-861-7.

It is a light-yellow to brownish-red transparent liquid, supplied as an approximately 50% aqueous solution.

It is phosphorus-free, readily water-soluble, and effective under alkaline conditions up to about pH 8–10.

A 1% aqueous solution has a pH of about 2.0–3.0; density is about 1.18–1.24 g/cm³.

It acts as a threshold scale inhibitor and dispersant for calcium carbonate, calcium sulfate, barium sulfate and calcium phosphate.

It is used in circulating cooling water, low-pressure boilers and closed-loop water systems.

It is used in desalination and evaporator systems under high-temperature, high-salinity conditions.

It is used in oilfield injection water, produced-water treatment, detergents and cement or soil-conditioning formulations.

Confirm solids content, pH, viscosity, density, residual monomer, iron and application-specific performance data.

Store in closed HDPE or compatible containers in a cool, dry, ventilated area away from strong oxidizers; avoid freezing and excessive heat.

Confirm packaging with the requested quantity and destination requirements.

Document requirements should be confirmed from the current specification, SDS, COA or other product-specific files.

The page is an RFQ entry point and does not state stock, price, MOQ or fixed lead time.

For an RFQ, state the intended use, required grade, quantity, packaging, destination and document needs.

FAQ - Technical & Supply Chain

Q:
What is Hydrolyzed Polymaleic Anhydride CAS 26099-09-2?

A: Hydrolyzed polymaleic anhydride, or HPMA, is a carboxylic-acid polymer supplied as a 50% aqueous solution. It is used as an antiscalant and dispersant in water-treatment systems, especially where high temperature and alkalinity are present.
Q:
How does HPMA compare with polyacrylic acid antiscalants?

A: HPMA contains a high density of carboxylic-acid groups on a polymaleic backbone. It often retains scale-inhibition and dispersion performance at higher temperatures and alkalinity than many conventional polyacrylates, making it suitable for demanding cooling and boiler systems.
Q:
Which scale types does HPMA control?

A: It is used to inhibit calcium carbonate, calcium sulfate, barium sulfate and calcium phosphate scale, and it can also disperse suspended solids, iron oxides and other deposits in circulating water.
Q:
What are the main applications?

A: Typical applications include open and closed cooling-water treatment, boiler-water treatment, reverse-osmosis scale control, oilfield produced-water treatment, seawater desalination and industrial process-water systems.
Q:
Why is high-temperature tolerance important?

A: In boilers and high-heat-flux systems, antiscalants can degrade or lose performance. HPMA is selected because its polymaleic structure helps maintain efficacy under elevated temperature and alkalinity, reducing deposition on heat-transfer surfaces.
Q:
Which grade and packaging does this listing cover?

A: The listing is industrial-grade 50% aqueous solution for water treatment. It is available in 25 kg or 250 kg HDPE drums and 1,000 L IBC tanks, with bulk packaging on request.
Q:
What specifications should be confirmed before ordering?

A: Confirm solids or active-polymer content, pH, viscosity, density, residual monomer, iron and any application-specific performance data. Request the batch analysis, technical data and safety information before purchase.
Q:
How should HPMA solution be stored and handled?

A: Store in closed HDPE or compatible containers in a cool, dry, ventilated area away from strong oxidizers and incompatible materials. Avoid freezing and excessive heat, use chemical-resistant gloves and eye protection, and follow the safety information.

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