Ethylene Oxide Sterilization is a chemical process consisting of a number of variables to control to achieve desired level of sterilization like:
•    Concentration of Gas

•    Relative Humidity

•    Duration of Exposure

•    Temperature

•    Pressure &

•    Nature of the Load
EtO is a powerful alkylating agent that disrupts the DNA of microorganisms, which prevents them from reproducing. EtO gas infiltrates packages as well as products themselves to kill micro organisms that are left during production or packaging processes. Normally an exposure device like a small dispenser or a large chamber which is specifically designed & built for EtO sterilization is used.

The ethylene oxide sterilization process may consist of three processing phases:
•   Pre-conditioning: Used to preheat and humidify product loads to predefined conditions. This will assure a repeatable EO sterilization process regardless of pre-processing load storage conditions

•   Sterilization: Performed using process phases specifically designed to provide the required level of ethylene oxide exposure to assure sterility for a device or family of devices

•   Aeration: Used to accelerate out gassing of exposed product loads and to contain and eliminate residual ethylene oxide emissions

Modern automatic machine has made this process easy to execute and highly effective. Size and scale of these sterilizers can vary based on the intended purpose. A hospital may use small dispenser where EtO cartridge (quantity in certain ml) is used whereas in an industrial scale operation large chamber (more than 1000 kg) may be used.



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