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Hydrolyzed Polymaleic Anhydride

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Hydrolyzed Polymaleic Anhydride(HPMA) is a low molecular weight polymeride, with average molecular weight 400-800.
  • Hydrolyzed Polymaleic Anhydride
  • ThFine
  • CAS No. 26099-09-2
  • Hydrolyzed Polymaleic Anhydride

Hydrolyzed Polymaleic Anhydride (HPMA)

CAS No.  26099-09-2 

Molecular Weight:  400-800

Structural Formula:



Hydrolyzed Polymaleic Anhydride is a low molecular weight polymeride, with average molecular weight 400-800, non-toxic, soluble in water, high chemical and thermal stability, decomposed temperature above 330℃. 

Hydrolyzed Polymaleic Anhydride has obvious threshold effect under high temperature (350℃) and high pH8.3level, suitable to be used in alkaline water systems. 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, 

Hydrolyzed Polymaleic Anhydride is widely used in desalination plant of flash vaporization equipment, low pressure boiler, steam locomotive, crude oil evaporation, petroleum pipeline, and industrial circulating cooling water systems.

In addition, Hydrolyzed Polymaleic Anhydride has good corrosion inhibition effect when used together with zinc salt. It can also used as additives for cement and saline soil improver.





Pale yellow to umber transparent liquid

Solid content %

50.0 min

Bromine value mg/g

50.0 max

pH(1% water solution)


Density (20℃) g/cm3



Hydrolyzed Polymaleic Anhydride is usually used together with organic phosphonate for circulating cooling water system, oilfield fill water, crude oil dewatering and low-pressure boilers. 

Hydrolyzed Polymaleic Anhydride has good scale inhibition (98%) and scale stripping properties. When EDTMPS ratio of HPMA is 1:3, it can be used for low-pressure boiler furnace water treatment. When used together with zinc salts, it can effectively inhibit carbon steel corrosion.

Package and Storage:

Normally in 200L HDPE drum, 1000L IBC, or 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, PMA, Maleic acid polymer, Poly(maleicacid), Hydrolyzed Polymaleic Anhydride, Polymaleic Acid


   Polycarboxylic Antiscalant and Dispersant

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