... tungsten wire 1.Grade W1, W2.1, WAl1, W-61 2.Purity 99.95$ ~ 99.98% 3.size: min dia 10 ... > material: pure tungsten and tungsten alloy Grade: W-1, W-2, WAL-1, WAL-2, W-613> as finished: black wire, electroytic cleaned wire ... , halogen lamp, auto lamp and hi-color temperature lamps, etc.2> for making supports and electron tubes. Quality and test: test ...