Oxygen has two important properties: it supports combustion and it supports life. Oxygen has been used in welding and medicine for over a hundred years and in other industries since the 1960ís. Oxygen is used by many other industries in a variety of oxidation processes. Mixed with fuel gases, oxygen provides a heat source for many welding, cutting and metal making processes. Oxygen-enhanced combustion increases productivity and helps to reduce harmful combustion by-products.



Physical Properties

Oxygen, symbol O, is a slightly magnetic gaseous element. Oxygen is more abundant than any other element on earth.

Three structural forms of oxygen are known. These are:

Gas Oxygen
Chemical formula O2
Molecular weight 32.0
Gas density 1.429 Kg/m3
SG vapour 1.326
Boiling point -183°C
Critical temperature -118.5°C
Critical pressure 50.4 bar


Oxygen is produced by the fractional distillation of liquid air. Air is liquefied and allowed to evaporate. The nitrogen in the liquid air boils off first, leaving the oxygen.


Oxygen strongly supports combustion and will aid any fire. It is an oxidant and therefore can react with materials to form an oxide producing a violent reaction. There is also a danger of cylinder rupture. For more detail on the hazards associated with oxygen check the Safety Data sheet.

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