... Polishing,Black,Sintering 1. Grand:W1,W22. Purity :>=99.95%3. Characteristic:Melting Point: 3410 Degrees CelsiusBoiling ... corrosion..6. Chemical composition Main Comp.W≥99.98Other Content≤Fe0.0026Al0.0006Si0.001Ca0.001Ni0.0009O0 ... found ingredient of material, cutter and heads, tungsten wire for lights instruments and conductor of heat, ... artillery, rockets, satellite, airplane and ship. tungsten bars