Question: is 5 hydrogen in argon flammable?
Answer: In 2010, gas mixtures that contain >5.5 mol% hydrogen in nitrogen were classified as flammable. (The previous flammable ntration was >5.7 mol% H2 in N2. (Airgas MSDS)) Similarly, gas mixtures that contain >2.94 mol% hydrogen in argon and >3.9 mol% hydrogen in helium are classified as flammable (Airgas MSDSs).