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Hydrolyzed Polymaleic Anhydride (HPMA) CAS No. 26099-09-2CAS: 26099-09-2

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Synonyms: 2-Butenedioicacid (Z)-, homopolymer;Maleic acid, polymers (8CI);Acumer 4200;Belclene 200;Belclene 200LA;DP 3328;Maleic acid homopolymer;Nonpol PMA 50W;2-Butenedioic acid(2Z)-, homopolymer;SH 150; Classification: Water Treatment Chemicals
EINECS: Molecular Formula: (C4H4O4)n
Melting Point: Boiling Point:
Stability: Water Solubility:
Refractive index: Flash Point:
Purity: 48.0% min Appearance: Pale yellow to umber transparent liquid
HazardClass: Brand Name:
worldwide: America UAE: Asia
Packaging & Delivery
Packaging Detail: 200L plastic drum,IBC(1000L),customers’ requirement
Delivery Detail:
Detailed Description


Hydrolyzed Polymaleic Anhydride (HPMA)

CAS No.  26099-09-2 

Structural Formula:

Hydrolyzed Polymaleic Anhydride (HPMA)


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℃. HPMAhas 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.


Items Index
Appearance Pale yellow to umber transparent liquid
Solid content % 48.0 min
Bromine value mg/g 80.0 max
Average molecular weight 450 min
pH(1%  solution) 2.0-3.0
Density (20℃)g/cm3 1.18 min


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.

Package and Storage:

200L plastic drum,IBC(1000L),customers’ requirement. storage for one year in shady room and dry place.

Safety Protection:

Acidity, Avoid contact with eye and skin, once contacted, flush with water.


HPMA; Hydrolyzed Polymaleic Anhydride; poly(maleicacid);

Polymaleic Acid; MALEIC ACID POLYMER;maleic acid homopolymer



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