What are the causes of automatic glass shattering?
2 Answers
Spontaneous breakage of tempered glass without direct mechanical force is known as tempered glass self-explosion, which is one of the inherent characteristics of tempered glass. There are many reasons for tempered glass to self-explode, which can be simply summarized as follows: 1. Stones, impurities, or bubbles in the glass. 2. Defects such as scratches, cracks, or deep chipped edges caused by improper operation during the glass processing, which can easily lead to stress concentration and result in tempered glass self-explosion. 3. Uneven or offset stress distribution in tempered glass: Uneven or asymmetric temperature gradients along the thickness of the glass during heating or cooling can cause tempered products to have a tendency to self-explode.
I have personal experience with a car window suddenly shattering while driving, and later learned it was due to temperature changes. Parking under the scorching sun in summer causes the glass surface to heat up quickly while the interior remains cool. The uneven thermal expansion and contraction build up pressure, which releases and cracks the glass. Manufacturing defects are also a major cause, such as improper edge treatment or tiny internal bubbles, leading to uneven material strength that becomes fragile when heated. Sometimes, installation issues like poorly fitted gaps can develop cracks after prolonged exposure to wind and sunlight. If you notice minor scratches or chips on the glass, address them promptly—they can expand into large cracks, threatening safety. Always park in shaded areas when possible and regularly inspect your car’s glass, especially the windshield. Safety comes first.
