M21ArC20 weld process gas meeting the requirements of ISO14175:M21, contains 20% 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 20 litre steel cylinder at 200 bar.