Application These products have been used in contact with air and a wide variety of fuels@ lubricants@ specific hydraulic fluids@ and a variety of gas turbine engine lubricants@ including higher thermo-oxidative stability (HTS) lubricants@ including those conforming to MIL-PRF-23699 Class HTS@ MIL-PRF-7808 Grade 4@ and AS5780 Class HPC; however@ usage is not limited to such applications. This material type has a typical service temperature range of -20 to +400 ??(-28 to +204 ??. These products are not suitable for use in phosphate ester based hydraulic fluids. Each application should be considered individually.