FED-STD-791D
Method 3432.1
September 30, 1986
COMPATIBILITY OF ELASTOMERS WITH AIRCRAFT TURBINE LUBRICANTS
1. SCOPE
1.1 This method is used for determining effects of aircraft turbine lubricants on
elastomers.
2. SUMMARY
2.1 It consists of determining the swelling effect, change in elongation, change in tensile
strength and change in hardness of standard fluorocarbon and fluorosilicone elastomer specimens
after being immersed in the sample for 72 h, at temperatures of 175C (347F) for fluorocarbon
specimens and 150C (302F) for fluorosilicone specimens.
3. SAMPLE SIZE
3.1 Approximately 1000 mL of the lubricant to be tested.
4. APPARATUS
4.1 Bath; aluminum block or oil bath capable of maintaining sample temperature within
1C (1.8F) of required test temperature. Aluminum block baths will have 5.0 mm 1 cm in
thickness of insulation. Oil baths will have a cover with openings for immersion of test tubes.
4.2 Test tubes, heat-resistant, 30 cm length and 3.9 cm outside diameter.
4.3 Hanger, specimen, made of stainless steel or nichrome wire.
4.4 Corks, standard size number 19.
4.5 ASTM Die C as described in ASTM D 412.
4.6 Bench Marker as described in ASTM D 412.
4.7 Micrometer as described in ASTM D 412.
4.8 Testing Machine for elongation and tensile strength measurements as described in
ASTM D 412.
4.9 Grips as described in ASTM D 412.
4.10 Durometer, Type A Shore as described in ASTM D 2240.
4.11 Stamp Pad and Ink as described in ASTM D 412.
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