... -L,WAL1-T,WAL2-L,WAL2-T 3.Black wire and electronic W-series weld tungsten wire Specifications:1) Size: ... minimum dia. 10 micron2) Material:pure tungsten and tungsten alloy3) As finished: black wire, electrolytic cleaned wire, hydrogen ... , fluorescent lamp, halogen lamp, auto lamp and hi-color temperature lamps,etc.2) For making supports and electron tubes W-series weld tungsten ...