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It depends on the mixture and the propellant in the can. Old style cans with CFCs and modern nitrogen pressurized cans have nonflammable propellants. Cans which have water based contents have nonflammable contents. Cans containing propane or similar propellants and or hydrocarbon contents would of course be flammable.

The biggest problem is not however their flammability.

In a fire situation the can and its contents over pressure as the can heats up until the can ruptures (not explode). The contents vaporize instantly due to the sudden drop in pressure. If the contents and or propellant are flammable this mass of vaporized flammable gas detonates or deflagrates in a process known as a BLEVE (Boiling Liquid Expanding Vapour Explosion) which either sends a ball of burning gas through the area and or sends shreds of ruptured can through the area (both cases are unpleasant)

If the contents and propellant are not flammable the can can still be projected by the rupture either as shrapnel or as a rocket powered can, and the gas can blow the initial fire all over the place

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Q: Are aerosol cans flammable
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