Steam sterilizers use heat and pressure to kill microorganisms. The hot steam condenses on the material to be sterilized, which kills the microorganisms due to the heat generated. In order to achieve the greatest possible saturation of steam - and thus a sterilization that’s as close to 100% as possible - the sterilization chamber is first evacuated during several vacuum cycles. After sterilization, an additional vacuum cycle is necessary to accelerate the drying process. 
Leybold vacuum pumps are known in this process for their high level of steam compatibility, which is essential for a long pump life. Additionally, Leybold vacuum pumps enable the process at significantly lower operating costs, thus contributing to the highest possible process efficiency.