long life filament for lamp 1.Material: tungsten 2,Purity: >= 99.95% 3.Density: 19.20g/cm3 ... Good corrosion resistance .3, short delivery time.Specification:1.Material: tungsten filament2,Purity: >= 99.95%3.Density: 19.20g/cm34.Grade ... coiled incandescent lamp, fluorescent lamp, halogen lamp, auto lamp and hi-color temperature lamps,etc. For making supports and electron tubes Stranded tungsten wire is ...