M21ArC20 (M21ArC20) weld process mixture is classified in group M21 according to ISO14175. Contains 20% Carbon Dioxide in Argon. Generally suitable for MAG welding of carbon / carbon manganese steel with all types of wires and stainless steel with flux cored wire. 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.