Eto Gas Ethylene Oxide Processing. Ethylene oxide (also known as EO or EtO) processing is widely used for the sterilization of healthcare devices and instruments. The process involves exposing products to ethylene oxide gas under vacuum in a sealed chamber. we are leading Ethylene Oxide (EtO) supplier in India. Ethylene Oxide (EtO) supplier in Vadodara, Gujarat. Ethylene Oxide (EtO) supplier in Gujarat.