Why auto glass breaks?

Although the composition of the glass for cars is stronger than that of a normal glass panel, in the windshield chips and cracks are inevitably formed. The windshield of an automobile is composed of two thick pieces of glass separated by a thin layer of plastic, which is designed to prevent the windshield shatter in accident. While a crack usually starts with the stroke of a stone, there are certain factors that contribute to its spread.


Hard waste materials are a constant hazard to drivers on busy streets or highways. Even the smallest stone represents a serious threat to the windshield. A stone or piece of gravel pushed by another car can create a visible damage to the glass of the car. Sometimes the damage is not visible. A small dent created by these wastes can be enough to ruin the integrity of a windshield. The result is weak and prone to larger cracks on visible glass.


Once there is an indentation, water vapor can cause cracks in the windshield. Water enters in smaller chips and cracks on the glass. This moisture causes large cracks in the glass. As the water temperature varies due to external weather conditions, their properties also vary. The expansion of water helps to break through the glass, resulting in a damaged windshield. This factor is difficult to block once there are indentations on the windshield because water vapor is constantly present in the air.

Low temperature

A windshield in cold weather tends to become concave, leading to the appearance of cracks extending horizontally. Existing nicks and cracks are subjected to more stress in this temperature. Furthermore, the two glass sheets comprising a windshield often have different temperatures because the temperature inside the car is different from the outside. On a cold day, the outer blade windshield contracts; while warmer temperatures expand the inner pane. This leads to the appearance and propagation of cracks in the glass. Conversely, the same principle is true on a hot day. The heat from outside, combined with the indoor air cold air conditioning work done to change shape glass. You may have heard of someone who threw hot water on a frozen windshield and the result was a crack in it. In this case, the hot water expanded windshield glass, while cold temperatures contracted the inner layer.

Bad roads

A trip on a bad road increases the likelihood of a sizable crack. Potholes, unpaved roads and other obstacles on the road contribute to separate the glass. Existing small chips and cracks extend on your car while driving on uneven ground.