WAL1 WAL2 Tungsten Products Tungsten Wire Surface Black / Cleaned For Lightening Tungsten with high melting point, high resistance, good intensity and low evaporation pressure, suitable for making heating element. Placing film material (aluminum, chrome, indium etc.) in vacuum metalizing machine, with high vacuum, the heating element (tungsten heater) will evaporate the film turn into shiny and beautiful film. Description of Tungsten Wire: 1. Purity: 99.95%-99.98%; 2. Grade: W1, WAL1,W-4 3. Density:19.2g/cm3 4. Package:wooden case or on request; 5. The tungsten wire features excellent formability, long life and super lighting efficiency. Mainly used for making various electron tube, H series auto lamp,halogen lamp and other special lamp.