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Hydrogen (H2) is the lightest of all gases. Colorless, odorless, tasteless and nontoxic, hydrogen exists as a gas at atmospheric temperatures and pressures. In metal fabrication, hydrogen serves as a protective atmosphere in high temperature operations such as stainless steel manufacturing. Hydrogen is commonly mixed with argon for increased travel speed, improved color match and enhanced weld metal fluidity during welding of austenitic grades of stainless steel (300 series). Hydrogen is used as an addition to argon mixtures to improve performance during plasma welding, gouging and cutting operations.

Chemical Formula H2
Minimum Purity 99.95 %
Cylinder CGA Outlet 350
MSDS P-4604
CAS Number 1333-74-0
UN Number 1049
US DOT Name Hydrogen, Compressed
US DOT Label Flammable Gas
US DOT Class 2.1 Flammable Gas


Cylinder Style Volume (ft3/m3) Pressure at 70 °F (21 °C) (psig/kPa) Part Number
T 261/7.24 2400/16547 HY T
K 196/5.44 2000/13790 HY K