NALCO 4221 is an organic corrosion inhibitor used for scavenging oxygen and passivating metal surfaces.
NALCO 4221 can be used as a direct replacement for hydrazine in boilers without the safety hazards and handling precautions associated with hydrazine.
NALCO 4221 reduces corrosion rates because it passivates feedwater and boiler internal systems.Lower corrosion rates from passivation translate directly into lower maintenance costs and reduced boiler downtime.
NALCO 4221 can be used in boiler systems operating at pressures up to 2500 psig (172 barg).
NALCO 4221 does not contribute dissolved solids, so it can be used ahead of spray attemperator water take-offs. It can also be used for wet lay-up of boilers and nondrainable superheaters.
– Function: Scale and corrosion inhibitor for water treatment.
– Application: Used in industrial boilers and cooling systems.