Oxygen Industrial grade 2.5 (99.5%). It is typically used with a fuel gas for cutting, brazing, welding and heating. It can also be used as a laser assist gas and has a multitude of applications across different industries. Supplied in a 30 litre Integra® cylinder at 300 bar. Integra® cylinders are safer, smaller and lighter. Featuring an Integrated flow optimiser (IFO) with a quick connector to save you time.