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Gas Direct Helimix SS38 Gas Cylinders SS38 contains 2% Carbon Dioxide, 38% Helium & 60% Argon making it a three part active shielding gas designed for MAG welding a wide variety of stainless steels. The gas performs best with materials of a thickness of 6mm to 15mm, particularly in spray and pulse transfer modes. The addition of Helium provides a fluid weld pool which is easy to work with for an experienced welder, allowing a low porosity weld with high fusion, eliminating the need for re-work. Supplied to your business in our 50 litre industrial cylinder, fitted with BS3 valves for maximum compatibility with existing machinery. Generally, SS38 is best suited for use in a welding bay setting, though can fit comfortably in larger welding trolleys to allow manoeuvrability around the workshop. Should you require a higher content of Helium, have a browse of our other SS mixtures – SS55 and SS85.