High purity stranded tungsten m coating Purity: 99.95% tungsten Strands: 1-4 Â bright and polished Single diameter: 0.75mm-0.81mm Application: aluminum vacuum metallizing We have our patent to electro-polish the surface of tungsten clean and bright, no pollution to the coating material. Durmetals' tungsten quality and longer lifetime,which makes us a good reputation in the vacuum coating market. We have the R&D capability to manufacture the tungsten esign and specifications.