MEASURING EVAPORATION QUALITY OF A LOW SATURATED VAPOR PRESSURE LUBRICATING GREASE IN VACUUM

The mass loss caused by evaporation of a low saturated vapor pressure lubricating grease is described.The grease is imported to lubricating space movable assemblies.A method is designed to measure its evaporation rate.It can evaluate the mass loss caused by evaporation in vacuum,obtain a saturated vapor pressure-temperat-ure equation,and provide a means to verify saturated vapor pressure at normal temperature.