HYDROGEN, REFRIGERATED LIQUID
Flammability | 4 | |
Toxicity | 0 | |
Body Contact | 0 | |
Reactivity | 0 | |
Chronic | 0 | |
SCALE: Min/Nil=0 Low=1 Moderate=2 High=3 Extreme=4 |
Liquefied hydrogen gas has been used in bubble chambers to study subatomic particles. It
is also used as a refrigerant, and is a major component in thermo- nuclear reaction. Has
been used as rocket fuel.
hydrogen, protium, "Gas code 135", "Gas code 140", "Gas code 240", "hydrogen, liquefied
gas", "liquid hydrogen", "hydrogen, cryogenic liquid", "para hydrogen", H2, H
Extremely flammable.
Risk of explosion if heated under confinement.
Although ingestion is not thought to produce harmful effects, the material may still be damaging to the health of the individual following ingestion, especially where pre- existing organ (e.g. liver, kidney) damage is evident. Present definitions of harmful or toxic substances are generally based on doses producing mortality (death) rather than those producing morbidity (disease, ill-health). Gastrointestinal tract discomfort may produce nausea and vomiting. In an occupational setting however, ingestion of insignificant quantities is not thought to be cause for concern. Considered an unlikely route of entry in commercial/industrial environments.
Although the material is not thought to be an irritant, direct contact with the eye may produce transient discomfort characterized by tearing or conjunctival redness (as with windburn).
The material is not thought to produce adverse health effects or skin irritation following contact (as classified using animal models). Nevertheless, good hygiene practice requires that exposure be kept to a minimum and that suitable gloves be used in an occupational setting.
The material is not thought to produce adverse health effects or irritation of the respiratory tract (as classified using animal models). Nevertheless, good hygiene practice requires that exposure be kept to a minimum and that suitable control measures be used in an occupational setting.
The primary routes of exposure are usually via inhalation of the gas or skin contact with the liquid. Overexposure can cause asphyxiation. Symptoms include headaches, drowsiness, excitation, excess salivation, vomiting, unconsciousness and may be fatal. Removal of contact lenses after an eye injury should only be undertaken by skilled personnel.