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Hydrolyzed Polymaleic Anhydride (HPMA)

Name of the Commodity: Hydrolyzed Polymaleic Anhydride (HPMA) Hydrolyzed Polymaleic  Anhydride (HPMA)
Appearance: light yellow to brownish liquid
CAS NO.: 26099-09-02

Physical Properties:
Density: 1.18 (48% aq.)
HPMA Homopolymer of maleic acid 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. Polymaleic acid has good scale inhibition against carbonate and phosphate scales under temperature 300 with effective time as long as 100 hours.HPMA can also used as additives for cement. HPMA's relative molecular weight is 400-800. It is non-poisonous and easily soluble in water. HPMA will decompose when the temperature is higher than 330℃.




 light yellow to brownish liquid

Solid content % ≥


Bromine value mg/g ≤


pH(1% aqueous solution)


Density(20℃)g/cm3   ≥


Homopolymer of maleic acid is applicable in alkaline environment. Because of the good scale inhibition and resist to high temperature, HPMA is widely used in braising device and low-pressure boiler of sea water desalinization and industrial circulating cooling water. HPMA is erosive. Its erosion effectiveness will be better if compounded with zinc salts. 
Packing: in 250kg drums, 20MT/FCL
Storage: store in dry place