M21ArC18 weld process gas meeting the requirements of ISO14175:M21, contains 18% Carbon dioxide in Argon. Ideal for MAG welding of carbon, carbon manganese and low-alloy steels. It can also be used to weld stainless steels materials but only with flux-cored filler wire due to its excellent penetration. Recommended for Spray transfer modes. 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.