It is commonly referred to as TEC and is typically used in oil, natural gas and geothermal wells to provide power and communication to down hole gauges. It has a core containing insulated electrical conductors or optical fibers. It is usually supplied as 5000ft to 35000ft. Alloy 316L is chromium - nickel austenitic stainless steel added with molybdenum and reduced carbon content. The addition of molybdenum ensures maximum resistance to pitting and crevice corrosion in environments containing halides including chlorides when compared to so-called conventional 18 chromium 8 nickel austenitic stainless steels such as 304L. The reduced carbon content reduces harmful chromium carbide precipitation during welding hence improves resistance to inter-granular corrosion.