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Materials used in the hydraulic system and surrounding it must be compatible with the hydraulic fluid. The fluid must not degrade their performance; neither should the materials degrade the fluid. Ther materials and components used in and near any aircraft hydraulic system are carefully selected by the airframe manufacturer.
The aircraft industry uses many synthetic materials - many are resistant to Skydrol fluids and some are not. Many that are not totally resistant require long exposure before damage results. Deviations from the recommended materials should not be made without prior consultation with the airframe manufacturer and the materials components suppliers. The Skydrol hydraulic fluid service manual (pub. 7249127) contains listings of the material/component manufacturers and additional compatibility information. The Materials Compatibility Chart contains the general rating of compatibility of various materials with Skydrol fluids.
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