... 4 times that of stainless steel, 2 times that of carbon steel and 100 times that of most nonmetal materials. ... electrical industry, graphite is used for production of electrode, brush, carbon rod, carbon tube, positive pole of mercury rectifier, washer, telephone component ... in heat insulation, base support, high temperature furnace tube, rod, panel and grate in process of vacuum metallurgy.6. Used ...