Medical Oxygen is produced in Cryogen & PSA Oxygen Plant. For Medical Oxygen, the gaseous purity requirement is a minimum of 90%, whereas for industrial Oxygen gas it’s 99%. However, in Medical Oxygen production, it has to be ensured that there is no other contamination in the gas, such as oil traces, Carbon monoxide & other impurities. While filling Medical Oxygen in cylinders, extra care is taken to purge the cylinder before filling.