PETROX - gasous mixture of ethylene oxide and carbon dioxide

The mixture, when released from the application cylinder to the atmosphere, is a colourless, toxic and flammable gas of a pleasant, etheric odour. Its toxicity is utilised in the process of sterilisation of medical utensils just after their production. The mixture is produced at our Olefins Expedition unit. The production process involves saturation of liquid ethylene oxide with gaseous carbon dioxide directly in the cylinder supplied by the customer. The process is carried out on a special automatic balance which guarantees achieving the desired composition of the mixture. 

The mixture is used for low-temperature sterilisation (at room temperature) of syringes, needles, plastic tubes and similar items made, in part or in whole, of plastics, at the manufacturer's premises. 


Molar mass: 44.05
State of matter at 20°C: gas
Colour: colourless
Odour: pleasant, etheric
Melting point (at 1013 hPa): –112.5 °C
Boiling point (at 1013 hPa): 10.73 °C
Critical temperature: 195.8 °C
Flash point: n/a – gas
Autoignition temperature: 430°C
Explosive limits of mixture with air:
- lower
- upper

2.6% by volume
100% by volume
Stoichiometric concentration: 7.75% by volume
Heat of vaporisation (10,7°C; 1013 hPa): 579.9 J/g
Heat of combustion: 29.7 kJ/g
Minimum energy of ignition in air: 0.06 mJ
Gas density (10.7°C; 1013 hPa): 1.9 g/dm3
Gas density relative to air: 1.52
Liquid density (6°C): 0.89 g/cm3
Vapour pressure at 20°C: 0.15 Mpa
Solubility in water: Soluble without limitations
Solubility in other solvents: Soluble without limitations in acetone, benzene, ethyl ether, methanol, carbon tetrachloride
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