Gas for inhalation
Medicinal Oxygen is used either
(1) in the undiluted form,
(2) as mixtures of Oxygen 99.5% or other oxygen products, or
(3) in the undiluted form or as mixtures in combination with ambient or compressed air of a suitable quality or other medicines.
OXYGEN 99.5% Definition
Oxygen 99.5% contains not less than 99.5% (v/v) of O2.
Production. Oxygen 99.5% is produced from ambient air by cryogenic distillation.​
The production method is validated to demonstrate that Oxygen 99.5% complies with the following limits:
carbon dioxide: maximum 300 ppm (v/v),
carbon monoxide: maximum 5 ppm (v/v),
water: maximum 67 ppm (v/v).
Gas medical oxygen is supplied to hospitals by cylinders. Also LOX tanks with vaporisers are incorporated in hospital premises with piping system layout connections to the wards directly, all controlled automatically.