The main reasons why perfume explodes are the composition of the perfume and the quality of the bottle. Perfume is mixed for industrial alcohol and industrial essence more come. Alcohol is a flammable and volatile substance. No matter what kind of perfume, the main ingredients include essence and alcohol, and the alcohol content is generally between 40% and 80%. Summer sun for half an hour, airtight parked cars temperature will reach above 65 ℃, and car perfume after volatile will produce a flammable substance, its critical point for 49 ℃, is very easy to caused an explosion of the perfume. And when the temperature in the car is too high, the air pressure in the perfume bottle increases, which may break the perfume bottle.