... various other specifications.Applications:1) Pure tungsten rods: used for producing twisted tungsten wire and tungsten heater, electron tube ... saving lamp wires, etc.3) Tungsten-thorium rods: pothook spring cathodes for electron tubes, cathode gas discharge lamp houses, etc.4 ... ) Tungsten-cerium rods: pothook spring cathodes for electron tubes, cathode gas discharge lamp houses, etc. ...