FED-STD-791D
Method 3604.2
September 30, 1986
SWELLING OF SYNTHETIC RUBBER BY AIRCRAFT TURBINE LUBRICANTS
1. SCOPE
1.1 This method is used for determining the swelling effect of aircraft turbine
lubricants on synthetic rubber. Synthetic lubricating fluids for aircraft turbine engines
must be compatible with materials-of-construction, such as elastomers used in the
engines. Elastomers are used in seals, o-rings, and related areas. This method is
designed to reveal lubricating fluid-elastomer compatibility problems relative to volume
swell.
2. SUMMARY
2.1 The volume of three standard test rubber samples is determined by water
displacement. The rubber samples are immersed in the test lubricant for a specified time
(such as 72, 96, or 168 h) at a given temperature. After storage, the average change in
volume is determined.
3. SAMPLE
3.1 Approximately 350 mL of the lubricant to be tested.
4. REFERENCES, STANDARDS AND APPARATUS
4.1 Oven, gravity-convection, 70 1C (158 2F).
4.2 Beakers (2), borosilicate, 400 mL.
4.3 Suspension device, glass or stainless-steel (for holding test rubber-sheets
completely immersed in specimen in 400-mL beaker so that they do not touch each other
or the beaker).
4.4 Hooks, stainless-steel wire (for suspending test rubber sheets from suspension
device and from balance).
4.5 Balance, sensitivity, 0.1 mg.
5. MATERIALS
5.1 CAUTION: SOME MATERIALS ARE TOXIC AND HAZARDOUS. The
materials references and standards listed in this section must be handled carefully.
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