What Causes the Rear Windshield to Shatter Spontaneously?

1 Answers
NadiaLynn
07/30/25 9:28am
The spontaneous shattering of the rear windshield is primarily due to poor tempering treatment of the glass itself, indicating a quality issue. Below is an introduction to automotive glass: 1. Overview: The production of automotive glass involves heating the glass in a furnace to near its softening temperature, then rapidly transferring it to air grids with varying cooling intensities for uneven cooling. 2. Function: This process creates different stress levels between the main viewing area and the peripheral areas of the glass. Typically, glass produced this way is zone-tempered glass. 3. Application: The peripheral areas, located in the strong wind positions of the air grids, undergo full tempering, resulting in well-fragmented pieces and high tempering strength. The main viewing area, situated in the weak cooling positions of the air grids, has larger fragments and lower tempering strength.
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