How strong are car windows?

Are car windows strong? I read somewhere that they’re stronger than steel, which doesn’t seem true to me.

Depending on the manufacturer of the window, it will take about 20,000 to 24,000 pounds per square inch (PSI) of force to break a car window. For reference, typical glass has a breaking point of 1,000 PSI. That’s because car windows are made from tempered glass, which is stronger, more heat-resistant, and won’t break into sharp, jagged pieces like regular glass.
You could say that car windows and windshields are five times stronger than steel, since a flawless fiber of glass pulled lengthwise will be much stronger than a comparable piece of steel. However, glass is much more brittle than steel, which is why it breaks so easily.
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Liz Jenson
Answered on Nov 25, 2021

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