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Stated very simply, the pressure inside an aerosol can is typically around 3 to 5 times atmospheric pressure. In theory, a typical can should be designed to contain roughly 2-1/2 to 3 times its normal pressure before bursting.
From the related link below:
"An aerosol can is typically safety accredited to around 12 bar internal pressure and, allowing for use at high ambient temperature and for storage in the hold of an aircraft at low ambient pressure, safety margins limit the internal can pressure to typically 4.5 to 5 bar at STP for the surrounding environment."
A "bar" is approximately 1 atmosphere as measured at sea level. "STP" means "Standard Temperature and Pressure, which usually means 0 degrees C and 1 bar.
If a vessel is heated beyond the critical temperature of its contents, pressure increases dramatically. The critical temperature is the temperature at which a liquid must become a gas, regardless of pressure. For instance, a can of "dust remover" usually contains liquefied 1,1-Difluoroethane, the critical temperature of which is 114 °C (236F). At that temperature, the pressure of a full container of that liquid must increase to about 45 bar, which would certainly burst the can. In practice, it would burst sometime before reaching that temperature.
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