We are suppling varieties of inorganic high-purity gases, such as nitrogen, helium, argon, oxygen, carbon monoxide, etc. ... gas Nature: colorless, odorless and tasteless Name MF Purity Impurity content (ppm) Hydrogen H2 99.999% O2≤1, N2≤5, CO≤1, CO2 ... 99.9999% H2O≤1ppm, O2≤0.2ppm, N2≤0.4ppm, CO2≤0.1ppm, CO≤0.1ppm, CH4≤0.2ppm High purity hydrogen gas 99.999%~99 ...