It is understood that high purity oxygen generally only requires oxygen purity， no special requirements for other health conditions， etc. At the same time， it also contains overspending carbon monoxide， methane and other harmful gases， moisture， bacteria and dust content is also very high， the industrial oxygen is mainly used for welding， gas welding， gas cutting and so on.

1、Chemical industry: In the production of synthetic ammonia， high-purity oxygen is mainly used for the oxidation of the quality gas to strengthen the process and improve the output value of fertiliser. And then， for example， the high temperature cracking of heavy oil， and the gasification of coal powder.

2、Defence industry: high purity oxygen， liquid oxygen is a very good modern rocket accelerant， in the supersonic aircraft also need liquid oxygen as an oxidant， combustible substances impregnated with liquid oxygen has a fierce explosive， can be made of liquid oxygen explosives.

3、Medical treatment: supply respiration， used for hypoxia， low oxygen or oxygen-free environment， such as: diving operations， mountaineering， high-altitude flight， world navigation， medical rescue， and so on.

4、Other aspects: high-purity oxygen itself as a flux with acetylene， propane and other combustible gases with the use of welding and cutting metal effect， in all walks of life， especially in the mechanical enterprises are widely used as a cutting is also very convenient， is the first choice of a cutting method.