1.Grade W1, W2.1, WAl1, W-61 2.Purity 99.95% ~ 99.98% ... SpecificationsTungsten Filament/Tungsten Wire Grade W1, W2.1, WAl1, W-61 Purity 99.95% ~ 99.98% ISO 9001:2000 ... .1 ~ 3.0 mmGrade: W1, W2.1, WAL1,W-61MOQ:1KG Certificate: ISO 9001:2000, SGSAvaiable:30 MT/MApplication ... : tungsten bar is used as heater for high-temperature furnace , heating electrodes in rare eath industry ...