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Oxygen (O2) Gas Safety Information


Key Characteristics. These are guidelines only – refer to published documents. OX-AN® cannot be held responsible in any way for the use of this data. Please contact us for more details

Technical Characteristics of Oxygen (O2)

Description:Oxygen is essential to support life. Whilst not explosive, it does support and accelerate combustion. Normal air contains 20.94% Oxygen – anything below this is known as Oxygen Deficient.
Properties:Colourless Odourless Tasteless Non-Explosive Supports Combustion Heavier than Air – Relative Density 1.105

Easily displaced by other gases introduced into the atmosphere

Risks:Depletion of oxygen gives rise to a risk of asphyxiation, brain damage and death.An increase in oxygen level increases flammability and combustion
Above 21%:Increase of flammability of materials which will burn
20.9%:Normal level
18-21%:No discernible symptoms can be detected by the individual. A risk assessment must be undertaken to understand the causes and determine whether it is safe to continue working.
11-18%Reduction of physical and intellectual performance without the sufferer being aware. Impaired judgement. Blurred vision.
8-11%Possibility of fainting within a few minutes without prior warning. Risk of death below 11%. The risk of death due to asphyxia is almost certain at oxygen levels below 10%
6-8%Inability to move. Fainting almost immediate. Resuscitation possible if carried out immediately. Brain damage, even if rescued.
Below 6%Immediate loss of consciousness occurs. Convulsive movements, gasping respiration, breathing ceases, cardiac arrest.



Further information about oxygen can be found here

See oxygen monitoring requirements.

Find information about about carbon monoxide here

Oxygen Hazards