Chapter - 1
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Fluorine
Silicon tetrafluoride
Hydrogen bromide
Tungsten hexafluoride
1.10.3
Flammable and Pyrophoric Gas Hazards
Flammable and pyrophoric gases could cause
fire, explosions, personal injury or death.
Pyrophoric gases will spontaneously ignite in air
Pyrophoric gases do not need a source of ignition to burn. However, low
concentrations may accumulate without pyrophoric ignition (i.e. silane can
accumulate up to a concentration of 2 molar percent [number of moles of silane
per fixed volume of air] before spontaneous ignition occurs). Pyrophoric gases
will ignite in the presence of oxygen.
Flammable mixtures can burn or explode
Fire and explosion hazards can be controlled by preventing the formation of
combustible fuel-oxidant mixtures and by eliminating sources of ignition such as
sparks, open flames or other heat sources.
Flammable mixtures will burn when ignited and can explode when the
concentration is above the lower explosive limit (LEL) and below the upper
explosive limit (UEL) for that specific gas. Some flammable gases may
accumulate as pockets in enclosed areas and subsequently explode if an ignition