Why Does a Car Windshield Crack Spontaneously?

[MacLouis]

Here are the reasons why a car windshield may crack spontaneously: 1. Spontaneous cracking of car windshields usually occurs at the edges of the glass, mainly due to the internal tensile stress and surface compressive stress generated during the heating and cooling process of laminated glass manufacturing. These forces remain stable when balanced, otherwise spontaneous cracking may occur. 2. If a car windshield is exposed to intense sunlight and then comes into contact with cold water, the excessive temperature variation may also cause the glass to crack. If the windshield cracks spontaneously, you should immediately pull over and stop driving. 3. Other possible causes of windshield cracking include improper installation of the car glass, the use of substandard adhesives, or poor-quality explosion-proof film applied to the glass, which may absorb heat instead of insulating it, leading to excessive temperature differences when the air conditioning is on inside the car.