CAS No. 7440-59-7 (Helium )
Molecular Formula: HeMolecular Weight: 4.0026
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References of Helium cas 7440-59-7
Vapors may cause dizziness or asphyxiation without warning. Vapors from liquefied gas are initially heavier than air and spread along ground.
A simple asphyxiant. A nonflammable gas. The safety issues for cryogenic helium are similar to those of liquid nitrogen; its extremely low temperatures can result in cold burns and the liquid to gas expansion ratio can cause explosions if no pressure-relief devices are installed. Containers of helium gas at 5 to 10 K should be handled as if they contain liquid helium due to the rapid and significant thermal expansion that occurs when helium gas at less than 10 K is warmed to room temperature.
Safety Statements: 9
S9:Keep container in a well-ventilated place.
RIDADR: UN 1046 2.2
WGK Germany: 3