... -3.0×L≥800Use as the electrode of high temperature, tungsten and heat young, heats component, electron tube negative pole, bar ... -18×L≥250Use as the electrode, electron tube part, draw line, support,etc.Tungsten piece,board(0.3-10)×(30-200)×L ... in the electric stove, insulate against heat to reject etc.Tungsten(electrode)Φ18-80×L≤700The body, fire law smelt tombarthite ...