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 ... Saturn Vbooster used in the Apollo program needed about 370,000 m3(13 million cubic feet) of helium to launch. ... CH4 ≤10,H2 O≤30 GB/T 7445-1995 99.999% O2 +Ar≤1,N2 ≤5,CO≤1,CO2 ≤1 ...