本试验方法提供了在延长的持续时间和发动机相关热条件下，将代表燃气轮机发动机使用的弹性体材料（板状）试样暴露于航空润滑剂的程序。对于AS5780要求，时间至少为1800小时，温度为100℃至160℃。正值体积变化表示试样膨胀，随后的负值体积变化则表示试样劣化，这两种财产在评估润滑剂与燃气轮机结构中使用的弹性体的相容性时都很重要。

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.