Hydrolyzed Polymaleic Anhydride, Polymaleic Acid 2019-01-04T03:37:33+00:00

Project Description



High-quality hydrolyzed polymaleic anhydride at the best price.

Hot Sale

CAS No.: 26099-09-2

Structural Formula:


Hydrolyzed polymaleic anhydride 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℃. Hydrolyzed polymaleic anhydride has an obvious threshold effect under high temperature (350℃) and high pH(8.3) level, suitable to be used in the 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, polymaleic acid 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, hydrolyzed polymaleic anhydride has good corrosion inhibition effect when used together with the zinc salt. Hydrolyzed polymaleic anhydride can also be used as additives for cement.


AppearancePale yellow to umber transparent liquid
Solid content %48.0 min
Bromine value mg/g80.0 max
Average molecular weight450 min
Density (20℃)g/cm31.18 min
pH(1% solution)2.0-3.0


Hydrolyzed polymaleic anhydride is usually used together with organic phosphonate at a 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 scales 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 a shady room and dry place.

Safety Protection:

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


AA/HPA copolymer (IR-225)
Acrylic acid maleic acid copolymer