99.999% Helium gas Refill gas cylinder Purity : Ne <4,H2<1,N2<2,CH4<0.5,H2O<3,CO2<0.5,O2<1 ( Unit:ppm) HeliumHelium (He) is a colorless, odorless, nonflammable gas.ApplicationsUsed in various analytical instrument applications, most commonly as a carrier gas in gas chromatography. Used as a heat transfer material; used in the manufacturing of calibration mixtures; component in laser gas mixtures. ...