... .Appearance: Rolling rods: Dark brown, the surface is smooth and straight, no defects (crackle, heavy skin, hole, trough, etc ... rods applications: Used in electric boosting glass kiln electrode and electric Vacuum parts, etc. Tungsten contentTypeDiameter(mm)Dia ... wires, electrodes, heaters in high temperature vacuum furnace and so on. Chemical Composition: GradeTungsten contentContents of Impurity ...