We are suppling varieties of inorganic high-purity gases, such as nitrogen, argon, hydrogen, oxygen, carbon monoxide, etc. ... widely used in Electronic industry, and chemical industry. Name MF Purity Impurity content (ppm) Helium He 99.999% O2≤1, H2O ... , CH4≤0.2, N2≤0.5 99.999%-99.9999% High Purity Helium Gas