Comments

SECTION 2: Hazards identification

Emergency Overview: Gas, at an absolute pressure less than 2.7 atmospheres and saturated with water vapour. None if pure. As supplied has a distinctive slight "rusty"odour. Prior to scrubbing has a chlorine type odour

Principle Routes of Exposure

Inhalation: Hydrogen gas is not toxic at normal temperature and pressure, but is an extremely flammable gas, posing a very serious fire hazard. When hydrogen is present in high concentrations in air it acts as a simple asphyxiant. Simple asphyxiants displace oxygen in the air and can cause symptoms of oxygen deprivation (asphyxiation) when present in high enough concentrations to lower the oxygen concentration. The available oxygen should be a minimum of 18% or harmful effects will result.(5) Effects of oxygen deficiency are 12-16% breathing and pulse rate are increased, with slight muscular incoordination; 10-14%: emotional upsets, abnormal fatigue from exertion, disturbed respiration; 6-10%: nausea and vomiting, inability to move freely, collapse, possible lack of consciousness; below 6%: convulsive movements, gasping, possible respiratory collapse and death. Since exercise increases the body's need for oxygen, symptoms will occur more quickly during exertion in an oxygen-deficient environment.(6,7) In survivors of oxygen deprivation, some or all organs, including the central nervous system and the brain, may have damage from low oxygen. These effects may or may not be reversible with time, depending on the degree and duration of the low oxygen and the amount of tissue injury. Skin Contact: Hydrogen gas is not irritating. Eye Contact: Hydrogen gas is not irritating. Ingestion: Ingestion exposure is not applicable to gases. Symptoms of Exposure: See above.