... and electric Vacuum parts, et 1. Tungsten bars Grade: W-1 W-42. Tungsten bars Appearance: Silver gray metallic luster.3. ... the pole, wire drawing, or doing steel-making additive. W-4 is used as the steel- making additive. The impurity content ... molybdenum wire, making glass fiber electrode, making steel-making additive.4. W and Molybdenum bars/ rods and other products:Tungsten electrodes: Molybdenum ...