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Hydrolyzed Polymaleic Anhydride (HPMA)

Hydrolyzed Polymaleic Anhydride

 Hydrolyzed Polymaleic Anhydride (HPMA)

CAS No.: 26099-09-2

HPMA is a polymeride of low molecular weight, with average molecular weight of 400-800. It is non-toxic, soluble in water. HPMA has high chemical and thermal stability, the decomposing temperature is 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 for 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 flash vaporizer of desalination plant, low pressure boiler, steam locomotive, crude oil evaporation, petroleum pipeline, and industrial circulating cooling water systems. In addition, HPMA has a better corrosion inhibition effect when used together with zinc salt.

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% water 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 cooling water, oilfield refill water, crude oil dewatering treatment and boiler water treatment of low-pressure boilers. HPMA has good scale inhibition (98%) and scale stripping properties. When used together with zinc salts, it can effectively inhibit the corrosion of carbon steel.
HPMA can also used as additives for cement.

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

Safety Protection:
HPMA is acid. Avoid contact with eye and skin. In case of contact, rinse with plenty of clean water.

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