Aqua-Quench Inhibitor 211

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Unit Price: $367.50
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Synthetic water dilutable quenchants such as Aqua-Quench 251 have built-in rust inhibition that usually provides ample protection for work and internal steel parts of quenching systems.  But, as good as this inhibition is, it can deplete over a period of time depending on the amount of work put through.  At low use concentrations and high production levels, this can occur more rapidly.


However, there is no reason to dump the solution and install fresh quenchant.  This would be uneconomical and add to plant effluent.  Instead, Aqua-Quench Inhibitor 211 can be added to the system to refresh rust inhibiting properties without affecting quenching speed.  It also protects work against rust after work is removed from the quenchant.


If the aqueous quenching bath is operated at a low concentration, Aqua-Quench Inhibitor 211 is ideal to supplement protection.  Another reason to add extra rust inhibition may be found in the system.  If it was designed for oil, fittings may not be sufficiently rust protected, or they may be in poor condition.


Aqua-Quench Inhibitor 211 doesn't affect fire resistance.  It contains no mineral oil, so aqueous quenching solutions remain less hazardous, without oil smoke or pollution.  Aqua-Quench Inhibitor 211 is also used in plain water quenchants to add ferrous corrosion inhibition.


To maintain rust inhibition without disturbing quenching characteristics, Aqua-Quench Inhibitor 211 concentrations must be properly controlled; this is easily accomplished by the "Nail Rust Test" which is a simple check any plant can easily perform.




·         Inhibits rust on quench tank and ferrous accessories

·         Protects work after quench

·         Fire resistant - no mineral oil

·         Work is easy to clean

·         Ideal to supplement protection in low concentration Aqua-Quench 251 solutions




Add 1% Aqua-Quench Inhibitor 211 to the total volume of the system. 


CAUTION:  Do not contaminate Aqua-Quench Inhibitor 211 solutions with any product containing amines.




A simple in-plant test quickly shows whether or not steel equipment is protected against corrosion.  The "nail rust test" is easy to conduct and will tell you if your system needs replenishment with Aqua-Quench Inhibitor 211.




The "nail rust test" shows if the inhibitor concentration is at the correct level to give the longest possible protection.  Rust occurs faster when the inhibitor is diluted or consumed.




          Three ten penny nails (clean with emery cloth or shot blasting)

          Three 4-ounce jars and covers (washed and rinsed)

          One 8-ounce container of used solution from tank

          Tap water



Prepare three solutions in the 4-ounce jars as follows.  Partially immerse the nail, cover and shake to thoroughly wet the nail.


Test Jar No. 




Used quenching solution

3 oz.


2 parts used solution

1 part water

2 oz.


1 part used solution

2 parts water

1 oz.


A clean, ten penny nail, partially immersed in water, will show some rust within four hours, and must rust in 24 hours.  Thus, if no rust appears, there is obviously rust inhibition in the aqueous quenching solution.




If no rust appears within 24 hours on nails in all three jars, then the system is protected.  If rust appears on the nail in any jar within 24 hours, adjust as follows:


Result of Test 

Aqua-Quench Inhibitor 211

All three nails rusted

1% to system

Rusted nails in Test Jars

2 and 3 (2:1 and 1:2)

.66% to system

(2/3 gal./100 gal.)

Only one rusty nail.33%

to system in jar (1:2)


(1/3 gal./100 gal.)               

No rusty nails

No addition needed


After adding Aqua-Quench Inhibitor 211 if needed, prepare new nails.  Take another fresh sample of solution from the quench tank and repeat the test for another 24 hours.

If no rust shows up in the solutions after this 24 hour period, dispose of the three test solutions and start three new test solutions.  Continuing tests of fresh solutions will show any change in the inhibitor concentration as it is consumed or diluted during operations.

No additional inhibitor is required as long as the three solutions show no rust on the nails and there is no rust on the equipment.


How to Clean


Aqua-Quench Inhibitor 211 in an uncontaminated Aqua-Quench 251 solution is completely water soluble and can be cleaned easily with a water rinse.  But, these solutions may become oil contaminated with use.  Then, if there is a delay between the quench and the wash, the solution will dry and leave a slight oil film on work that is more difficult to clean.


Where there is no delay, or if no contaminants are present in the quench, a water rinse is enough to remove the quenchants residue.  Where there is only one washer serving a department, a detergent such as Cerfa-Kleen will provide better general cleaning, and is necessary to remove oil films.  Select a cleaning compound that will remove the most difficult soil, which is usually a marquenching oil, or a quenching oil.  This will easily clean Aqua-Quench Inhibitor 211 and glycol type quenching solutions.




Kinematic Viscosity @ 100°F

1.63 cSt


Clear yellow fluid

Freeze Range begins


Weight, Lbs./Gal.


pH Value (Neat)

11.0 ± 0.5 



Aqua-Quench Inhibitor 211 is shipped in 5 (U.S.) gallon pails and in 55 (U.S.) gallon drums.




Compound Industrial Process, Water Treating Chemical




Under normal conditions, the recommended shelf life for Aqua-Quench Inhibitor 211 is one (1) year.




No health or safety hazards exist when Aqua-Quench Inhibitor 211 is stored, used and disposed of in accordance with instructions given on the Material Safety Data Sheet for this product.




The information given here is considered to be correct, and is offered for your consideration, investigation and verification.  No warranties are expressed or implied since the use of our products is beyond our control.  Statements concerning the use of Houghton products are not to be construed as recommending the infringement of any patent.




This commodity and its technology are subject to the export control laws and regulations of the United States Government.  Buyer agrees that it shall not make any disposition, by way of export, diversion, transshipment, re-export or otherwise, except as expressly permitted under United States law.


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