... service life, resistance to corrosion..6. Chemical composition Main Comp.W≥99.98Other Content≤Fe0.0026Al0.0006Si0.001Ca0.001Ni0.0009O0.0018Cu0 ... : Mainly used to found ingredient of material, cutter and heads, tungsten wire for lights instruments and conductor of heat, crankshaft and ... guns, artillery, rockets, satellite, airplane and ship. 99.95% Round Tungsten Bar