Figure 1. Many aerosol cleaners and furniture polishes contain warnings not to use the products near fire, flames or pilot lights, but only a couple of the products actually ignited during our testing.

Figure 2. When sprayed onto a surface, we could not ignite this insecticide, but when we sprayed it into an open flame, it was a different story. If the can ruptures during a fire, for instance, quite a flash would likely occur as the flammable contents burn off suddenly.