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Hydrolyzed Polymaleic Anhydride (HPMA)

CAS No. 26099-09-2 EINECS No. 607-861-7
Molecular Formula (C4H4O4)n Molecular Weight 400~800
Structural Formula

HPMA Structural Formula

Product Features

HPMA is a low molecular weight polymeride, with average molecular weight 400-800. No toxicity, soluble in water, high chemical and thermal stability, decomposed temperature above 330℃. HPMA has obvious threshold effect under high temperature (350℃) and high pH(8.3)level, suitable to be used in alkaline water system or built with agents. It has good scale inhibition against carbonate and phosphate scales under temperature 300℃ with effective time as long as 100 hours. Due to its good scale inhibition and high temperature tolerance properties, HPMA is widely used in desalination plant of flash vaporization equipment, low pressure boiler, steam locomotive, crude oil evaporation, petroleum pipeline, and industrial circulating cool water systems. In addition, HPMA has good corrosion inhibition effect when used together with zinc salt. HPMA can also used as additives for cement.

Technical Specification

Parameter Standard
Appearance Pale yellow to umber transparent liquid
Solid content, % 48.0 min
Bromine value, mg/g 50.0 max
pH (1% water solution) 2.0-3.0
Density (20℃), g/cm3 1.18 min

Applications & Usage

HPMA is usually used together with organic phosphonate at dosage of 1-15ppm for circulating cool water system, oilfield fill water, crude oil dewatering and low-pressure boilers. HPMA has good scale inhibition (98%) and scale stripping properties. When used together with zinc salts, it can effectively inhibit carbon steel corrosion.

HPMA is also widely used in desalination plant of flash vaporization equipment, steam locomotive and petroleum pipeline. In addition, It can be used in combination with phosphonates to improve performance and reduce phosphonate levels and thus provide a superior alternative to acrylate-based polymers. It can also be used as dispersant and scale inhibitor in cooling water treatment, Reverse Osmosis systems and many other scale control applications.

Scale & Corrosion Inhibition Performance

CaCO3 inhibition CaSO4 inhibition Silicate inhibition Calcium tolerance
Excellent Very good Very good Excellent
Clay/Silt Dispersion Thermal Stability
Very good Excellent

Package & Storage

25L Drum 200L Drum 1000L IBC ISO Tank
Storage for 10 months in shady room and dry place.

Hazard & Safety Precaution

Hazard Information Satety Precaution

Corrosive, Class 8, UN 3265

Once contacted with eye and skin, flush with plenty of clean water

Alternative Name / Synonyms

  1. HPMA;
  2. Hydrolyzed Polymaleic Anhydride; 
  3. poly(maleicacid);
  4. Polymaleic Acid;
  6. Polymaleic Acid