... Filament used as Incandescent filament,GLS filament, is uniformity in pitch,shape,color,luster and piece weight. We can supply a variety of tungsten filament of ... tungsten industry chain (mine - powder - ingot - wire - filament)2) Advanced equipment imported from Switzerland FALMA, South Korea & Japan3 ... weight: ±3%mg5) Cold resistance: ±3%ohm Tungsten Filament,Incandescent filament,GLS filament