Atomic mass: 4.003
Boiling point: -268.9°C Melting point: -272.2°C Solubility in water, ml/100ml at 20°C: 0.86 Relative vapour density (air = 1): 0.14
EXPOSURE & HEALTH EFFECTS
Routes of exposure The substance can be absorbed into the body by inhalation.
Effects of short-term exposure The liquid may cause frostbite. Asphyxiation.
Inhalation risk On loss of containment this substance can cause suffocation by lowering the oxygen content of the air in confined areas.
Effects of long-term or repeated exposure
OCCUPATIONAL EXPOSURE LIMITS
UN number 1046 is for helium, compressed. High concentrations in the air cause a deficiency of oxygen with the risk of unconsciousness or death. Check oxygen content before entering area.
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