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The electric match, which consists of an electrical conductor wrapped
in a combustible material, activates with a current pulse between 1 to 3 amperes in less than 2
milliseconds. When the conductor becomes hot enough, it ignites the combustible material, which
initiates the gas generator. In a seat belt pre-tensioner, this hot gas is used to drive a piston that pulls
the slack out of the seat belt. In an airbag, the initiator is used to ignite solid propellant inside the
airbag inflater. The burning propellant generates inert gas which rapidly inflates the airbag in
approximately 20 to 30 milliseconds. An airbag must inflate quickly in order to be fully inflated by
the time the forward-traveling occupant reaches its outer surface. Typically, the decision to deploy
an airbag in a frontal crash is made within 15 to 30 milliseconds after the onset of the crash, and
both the driver and passenger airbags are fully inflated within approximately 60-80 milliseconds
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