Oxygen Industrial grade 2.5 (99.5%) has a higher concentration of Oxygen compared to the 21% in the air we breathe. The high oxidation potential of this product makes it ideal for combustion. It is typically used with a fuel gas for cutting, welding and other combustion applications. Supplied in a 30 litre Integra® cylinder at 300 bar. Integra® cylinders are safer, smaller and lighter. The Integra® cylinder is designed to be used with a choice of Integra® flow optimisers (available separately) which ensure optimum weld results whilst reducing excessive gas usage too.