Vacuum pumps are constantly evolving towards high speeds

Vacuum pump continues to develop to high speed, due to the high-speed friction of the sliding vane and the pump body to increase the oil temperature, the oil is easy to oxidize and decompose, especially the diffusion pump is often in a very high temperature environment to work, so that the system vapor pressure increases, vacuum degree decreases, so the vacuum pump oil is required to have good thermal oxidation stability.
If the vacuum pump inhales corrosive gas, it will react chemically with the oil and corrode the parts in the pump; The inhaled air often contains water vapor condensate, which causes the emulsification of vacuum pump oil and corrodes the metal, so it is required to have good corrosion resistance and demulsibility.
The main requirement is that the vacuum pump does not carry light components, so as not to affect the saturated vapor pressure of the oil.
Ultimate pressure is an important performance indicator of vacuum pump oil to understand the ultimate pressure of vacuum pump at the lowest vacuum ultimate pressure.