Fact Sheet

CorTrol* OS7785
Oxygen Scavenger
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Controls oxygen corrosion

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Provides superior metal conditioning for feedwater and condensate systems

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Improves boiler reliability

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Contains no hydrazine or derivatives of hydrazine

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(>1000 psig) [70 kg/cm2] applications where boiler
water solids are a major concern.

Contributes no inorganic solids to feedwater

CorTrol OS7785 contributes no inorganic dissolved
solids to the system, which may result in a reduction in boiler blowdown with corresponding energy
savings.

Description and Use
CorTrol OS7785

CorTrol* OS7785 is an aqueous blend of an organic
oxygen scavenging compound and a neutralizing
amine. This product is a rapid and highly effective
oxygen scavenger, and does not contribute to inorganic boiler water solids. In addition, it is safer to
handle than hydrazine.
CorTrol OS7785 is designed for the control of corrosion caused by dissolved oxygen in makeup, condensate, and feedwater systems. It is not suitable
for use where the steam directly contacts food per
FDA 21 CFR 173.310 or USDA Section G6. It is approved for use where steam contacts paper or paperboard used in food packaging per FDA
21CFR176.170 and 176.180.

Typical Applications
Even with good deaerating heater operation, sufficient dissolved oxygen can remain in the feedwater
to damage the boiler system. Even low levels of dissolved oxygen are critical to high-pressure (high
temperature) systems. Oxygen in water produces
pitting which is particularly severe because of its
localized nature. Economizers and feedwater heaters are particularly susceptible to oxygen attack.
While it can effectively be used in low-pressure
boiler systems, CorTrol OS7785 was specially developed as an oxygen scavenger for higher pressure

Figure 1:

Comparison of CorTrol OS7785 and hydrazine for
removing dissolved oxygen.

The oxygen scavenging efficiency of CorTrol
OS7785 is better than hydrazine (see Figure 1).
Because it is such a strong reducing agent, CorTrol
OS7785 has also demonstrated the ability to reduce
certain forms of metallic oxides, thereby conditioning metal surfaces (see Figure 2).
Because CorTrol OS7785 is an excellent oxygen
scavenger and provides superior metal conditioning
at typical condensate temperatures, the product is
highly desirable for condensate system protection.
Find a contact near you by visiting www.ge.com/water and clicking on “Contact Us”.
* Trademark of General Electric Company; may be registered in one or more countries.
©2009, General Electric Company. All rights reserved.
AM-FSbCorTrolOS7785_EN.doc Sep-09