FED-STD-791D
5.3.1 Steel metal square 0.081 cm thick by 2.5 cm square with holding wire
(figure 1.). This specimen has been used in Federal Standard Test Method 791C Method
5308.7.
(Note: Paper clips have been successfully used for holding metal square)
5.4 Timer
5.5 Thermometer, having a range of 50 C.
6. MATERIALS
6.1 Toluene, CP, at least 99 % (Caution- Flammable, vapor harmful)
7. PROCEDURE
7.1 Wash the test assembly with toluene until free from any soil or oil film. Dry
the test assembly using laboratory air system. Weight the test assembly to the nearest 0.1
g. Approximately 0.4 g of MIL-PRF-10924 grease is uniformly applied to both sides of
the metal coupon. The test assembly is placed in a beaker using a holder. Add the test
solvent into the beaker until the test assembly is completely immersed.
7.2 Place the beaker in the ultrasonic cleaner that is maintained water
temperatures of 50 C. Start the test using a timer. Observe the test assembly until all
grease is removed from metal coupon. Record the time in minutes. If the portion of
grease still remains on the metal coupon after 100 minutes, the test is immediately
terminated with the testing time being recorded as 100 minutes.
7.3 Repeat two more tests in accordance with 7.1 and 7.2.
8. CALCULATION
8.1 Calculate the cleaning power as follows:
Solvent cleaning power, % = ((100-A)/100) * 100
Where A is average time of three runs obtained from the tests
(Note 2. The cleaning power of water is found as zero % while toluene is 92-
96 %)
396
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business