Abstract: The influence of three kinds of antioxidants and three kinds of extreme-pressure anti-wear additives on the compatibility between aviation lubricants and rubbers was studied by using pentaerythritol ester as base oil which meets MIL-PRF-23699F standard applied in aviation engine oil. The results showed that the most of additives had little effect on the volume change rate of acrylonitrile-butadiene rubbers, while phosphate additive exacerbated the volume change rate. Three kinds of extreme-pressure anti-wear additives had little effect on the volume change rate of fluoro rubber, while three antioxidants slightly reduced the volume change rate of it. Amine additives in ester lubricants had little effect on the tensile properties of fluoro rubber. Acidic phosphate reduced the volume change rate of silicone rubber and fluorosilicone rubber，even shrinked the volume of silicone rubber. Acidic phosphate can react with silicone rubber and fluorosilicone rubber, which caused the loss of the tensile properties.

Key words: rubber compatibility, aviation lubricant, pentaerythritol ester, antioxidant, extreme-pressure anti-wear additive