Hydrogen is the lightest gas known. It is a colorless, odorless and tasteless gas and is flammable and nontoxic at atmospheric temperatures and pressures. The Compressed Gas Association (CGA) specification G-5.3 is the industry standard. Type II, Grade A is considered commercial liquid hydrogen and Type I, Grade B is considered commercial gaseous hydrogen.
Features
- Colorless, odorless, tasteless and flammable gas
- Burns with an invisible flame
- Lighter than air, will collect at ceiling level
- Produces a flame of approximately 2,834°C when used with oxygen
Specifications
Cylinder
- Connection Valve (CGA) : CGA 350
- Cylinder Size : 300
- Cylinder Pressure (psig) : 2400
- Cylinder Volume (lbs, l, or ft3) : 261
- Cylinder Dimensions : 55.5 X 9.28
- Cylinder Material : High Pressure Steel
Technical
- Gas : Hydrogen
- Symbol : H2
- Purity : 99.98
- Chemical Symbol : H2
- Gas Grade : Industrial
- Molecular Mass : 2.02 g/mol
- Specific Volume : 192 ft3/lb (11.9 m3/kg)
- CAS Number : 1333-74-0
Shipping
- Shipping Name : Hydrogen, Compressed
- Hazard Class : 2.1
- UN Number : 1049
- Label : Flammable Gas
Safety
- Physical state : Gas
- Appearance : Colorless gas
- Color : Colorless
- Odor : Odorless
- Melting point : -259.2 °C (-434.56°F)
- Boiling point : -252.9 °C (-422.97°F)
- Critical temperature : -239.9 °C (-399.82°F)
- Auto-ignition temperature : 566 °C (1051°F)
- Density : 0.089 g/l (0.0056 lb/ft3) (at STP = 0°C and 1atm)
- Relative gas density : 0.07
- Solubility : Water: 1.6 mg/l
- Oxidizing properties : None
- Explosion limits : 4 – 77 vol %
