Hydrolyzed Polymaleic Anhydride (CAS 26099-09-2), commonly abbreviated as HPMA, is a low molecular weight polyelectrolyte functioning as a high-efficiency scale inhibitor and dispersant in industrial water treatment systems. This solvent-based polymer, technically identified as polymaleic acid, exhibits exceptional thermal stability and threshold inhibition capabilities, making it the preferred antiscalant for high-temperature environments such as flash desalination plants and low-pressure boilers. PASP is a biodegradable polymeric option for non-phosphorus scale-control programs. We provide bulk supply of this 50% solid content liquid with competitive factory pricing to ensure operational efficiency for desalination and cooling water facilities. Our polymerization technology controls the molecular weight within a tight range (400-800), making MSDS, TDS, COA available alongside customized specifications to meet specific pH tolerance or compatibility needs.
Hydrolyzed Polymaleic Anhydride (HPMA) CAS 26099-09-2
- 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
Product Description
Product Overview
Hydrolyzed Polymaleic Anhydride (HPMA) is a low-molecular-weight polymer based on maleic anhydride, specially designed as a high-efficiency scale inhibitor and dispersant for industrial water treatment. It offers excellent performance under high temperature and alkaline conditions and is widely used in circulating cooling water, boiler water, desalination, and oilfield water systems.
📧 Email: info@industrochem.com – Contact our technical sales team for detailed COA, sample support, and bulk pricing.
Key Identification
- CAS: 26099-09-2
- Einecs (EC No.): 607-861-7
- Molecular Formula (repeat unit): (C₄H₄O₄)ₓ
- Grade: Industrial grade, 50% aqueous solution (water treatment grade)
- Package: 25 kg / 250 kg HDPE drums / 1,000 L IBC tanks, or customized packing as required
HPMA is phosphorus-free, readily soluble in water, and shows strong threshold inhibition and dispersion toward carbonate and phosphate scales, making it suitable for modern, environmentally conscious water treatment formulations.
Physicochemical Properties
| Item | Typical Data |
|---|---|
| Chemical name | Hydrolyzed Polymaleic Anhydride (HPMA) |
| CAS No. | 26099-09-2 |
| EC / Einecs No. | 607-861-7 |
| Molecular formula (repeat unit) | (C₄H₄O₄)ₓ |
| Chemical nature | Low-molecular-weight polycarboxylic polymer |
| Appearance | Light yellow to brownish red transparent liquid |
| Solid content | 48–50 wt.% |
| Average molecular weight | 400–800 |
| pH (1% aqueous solution, 25 °C) | 2.0–3.0 |
| Density (20–25 °C) | 1.18–1.24 g/cm³ |
| Viscosity (25 °C) | Typically 50–300 mPa·s |
| Solubility | Completely soluble in water |
| Thermal stability | Chemically stable; decomposition above ~330 °C |
| Effective temperature range | Up to ~300 °C in scale-inhibition service |
| Effective pH range | Effective under alkaline conditions, up to pH ~8–10 |
| Toxicological profile | Low-toxicity industrial chemical; non-volatile |
*The above values are typical data from industrial-grade HPMA supplied by Chinese manufacturers and are not to be taken as product specifications for any specific lot.
Applications
1. Industrial circulating cooling water & boiler water
- Acts as a threshold scale inhibitor and dispersant for calcium carbonate, calcium phosphate and other inorganic scales.
- Used alone or in combination with organic phosphonates to reduce scale deposition and improve heat-exchange efficiency in recirculating cooling systems, low-pressure boilers and closed-loop water systems.
2. Desalination & evaporator systems
- Suitable for high-temperature, high-salinity conditions such as multi-stage flash (MSF) and other desalination units, helping to control carbonate/phosphate scale and extend online operation time.
3. Oilfield water treatment
- Applied in injection water, crude oil dewatering systems, and low-pressure boilers in oilfields to control scale, maintain pipeline cleanliness, and protect equipment surfaces.
4. Detergents & daily chemicals
- Used as a dispersant in detergents to prevent inorganic salts and soil particles from redepositing on textiles, especially under hard-water conditions.
5. Cement additive & soil conditioner
- Serves as a dispersing/water-reducing component in cement formulations and as a soil improver in saline or alkaline soils, leveraging its polyelectrolyte nature.
For detailed formulation advice and dosage recommendations in your specific system, please contact:
📧 Email: info@industrochem.com
For related water-treatment scale-control raw materials, see PASP and HEDP.
Storage Conditions
- Store in a cool, dry, and well-ventilated warehouse.
- Keep container tightly closed; protect from direct sunlight and high temperatures.
- Recommended storage temperature: 0–40 °C; avoid freezing (precipitation or stratification may occur at low temperatures).
- Shelf life: typically 12 months in original, unopened packaging under recommended conditions.
- If long-term storage leads to slight stratification or turbidity, mix or stir thoroughly before use; performance is usually not affected.
Safety Precautions
- HPMA solutions are acidic; avoid direct contact with skin, eyes, and clothing.
- Wear appropriate personal protective equipment (PPE): chemical-resistant gloves, safety goggles/face shield, and protective clothing when handling.
- In case of skin contact: immediately wash with plenty of water and soap. Remove contaminated clothing.
- In case of eye contact: rinse cautiously with clean water for at least 15 minutes and seek medical attention if irritation persists.
- If swallowed: rinse mouth with water, do not induce vomiting; seek medical advice.
- Ensure good ventilation in working areas; avoid aerosol generation and splashing.
- Spillage: contain and absorb with inert material (sand/earth), collect into suitable containers for disposal according to local regulations.
For the latest SDS and regulatory documentation, please request it from:
📧 Email: info@industrochem.com
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.
Ordering & Documentation
Key information for document requests, quotations, and supply planning.
Documents
COA, TDS, SDS/MSDS and packing details are available on request.
Quotation
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Sample & Supply
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Storage & Shipping
Product-specific conditions are confirmed before order.
