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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

Find information about about carbon monoxide here

Oxygen Hazards