Helium gas is not flammable and safe for use, cause it is noble gas not like hydrogen. Hydrogen is much more and cheaper than helium on this planet however it is not safe and most countries forbid use. The price of helium is expensive but now the price keeps rising, but the need still has too big in the market. The bad news is most helium gases are used for Only One time – the wastage of helium gas is very uneconomical, it is very popular for Helium Balloons and Blimps.