Evaluation of Gas Turbine Engine Lubricant Compatibility with Elastomer Slabs - Long Duration Test
This test method provides procedures for exposing specimens of elastomer material (slab form) representative to those used in gas turbine engines to aviation lubricants under extended duration and engine relevant thermal conditions. For AS5780 requirements the time is at least 1800 hours and temperatures are 100 °C to 160 °C. Positive volume change is an indication of specimen swell and subsequent negative volume change is an indication of specimen deterioration, both properties are important in the evaluation of the compatibility of the lubricant with elastomers used in the construction of the gas turbine.
This SAE Aerospace Recommended Practice is intended to determine the compatibility of aviation propulsion system grade elastomers with the aviation lubricants that they may be exposed to during service, such as AS5780 Gas Turbine Engine Lubricants. Properties of such elastomeric materials may deteriorate during exposure to aviation lubricants, thereby affecting their performance capabilities and potentially result in part failure. This test was initially developed as a Safran Aircraft Engine test used to approve new synthetic turbine oils.