... :W1,W2,WAL1,WAL2 Purity : 99.95%min ISO9001:2000 Tungsten rods and barsTechnique: Forged Surface:polished standard:GB4187-84 material:W1 ... , wire drawing , or doing steel-making additive used for drawing tungsten wires, electrodes, heaters in high temperature vacuum furnace and so on ...