Oxygen Performance 3.5 (99.95%) is a high purity product. (H2O <5 ppm, CO + CO2 <2 ppm, THC <10 ppm). The air we breathe consists of only 21% of Oxygen compared to this product. Its high oxidation potential makes it ideal for accelerating combustion. This product is used with a fuel gas for improved quality of cutting, welding and other combustion applications. Supplied in a 50 litre steel cylinder at 200 bar.