Name:helium gas Purity:99.9-99.999% Packing:200bar or 150bar cylinder pakage or packed according to ... demand Name: helium gasPurity: 99.9~99.999%Property: colourless, odourless, non-flammable, non-reactive, inert gas Application ... ,CH4 ≤10,H2 O≤30 GB/T 7445-1995 99.999% O2 +Ar≤1,N2 ≤5,CO≤1,CO2 ≤1,CH4 ...