... of hardness, low mechanical abrasion and melting resistance, Tungsten rod/bar is widely applied to electrical contacts ... cathode of transmitting tube, hyperthermia electrode and reaming tungsten wireManufacturing folding heating cord of electron tubeWAL2>=99.92Manufacturing ... tube, grid wire and cathodeW1>=99.95Manufacturing reaming tungsten wire and heating componentsW2>=99.92Manufacturing grid side ...