Aurubis Cu-ETP (electrolytic tough pitch copper) is an electrolytically refined, high conductivity copper that contains a minimum of 99.90% Cu and a controlled amount of oxygen (generally 0.02–0.04%). It has a minimum electrical conductivity of 100% IACS. Special precautions are necessary when heat treating, welding, or brazing Aurubis Cu-ETP in atmospheres containing hydrogen so as to avoid hydrogen embrittlement. Cu-ETP is the most widely used grade of copper in electrical applications and represents over half of global copper use. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming and heat treating. Filing Code: Cu-922. Producer or source: Aurubis AG.