Wikipedia
Helamin is a boiler feedwater treatment based on amines and polyamines. The name is a registered trademark of Filtro, SA, Geneva, Switzerland. Chemically, most of the Helamin types are stated by the manufacturer to be a "mixture of polyamines and polycarboxylates in aqueous solution", but some also utilize volatile amines, ammonia, polyelectrolytes, organic polymers, and scavengers of dissolved oxygen.
Helamin is one of the commercial fouling and corrosion inhibitors. It uses the characteristics of aliphatic polyamine. In contrast to the conventional method of the water treatment, its action is based on a preventive protection of the surfaces. Helamin forms a film (i.e., is one of numerous available "filming amines"), which prevents corrosion and fouling on the water-side walls in steam boilers and piping systems. It happens because Helamin has an affinity to metal and oxide surfaces. Crystals which do form in the presence of Helamine are isolated, so that they do not tend to group themselves. Thus deposit consolidation is inhibited. Already existing oxide surface deposits are gradually removed. Boiler develops a fine, liquid mud, which is easier to remove from the boiler.
Helamin does not significantly decompose even at high temperature and pressure employed in the modern sub-critical -water power-plant boilers. Helamin treatment can be successfully employed in steam generators, warm and hot water piping systems, superheaters, as well as cooling circuits to mitigate some of the difficult problems of the corrosion and fouling. However, cation conductivity of water tends to increase with the use of Helamin.