The reason is that the small sharp and hard ceramic fragments induce scratches that pierce through the residual stresses of the glass.
Ceramic break window.
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The ceramic could leave a scratch but that is all that would happen.
Several people have suggested that the charge of the glass and the ceramic from the spark plug create a spark that breaks the glass in an explosive way.
Although effective spark plug fragments will not work all the time.
This is a myth.
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Spark plugs are made of aluminum oxide ceramic which is exceptionally hard.
The only charge of any significance here is the one you ll pay to replace your window.
The hard ceramic fragments of broken spark plugs are great at breaking tempered glass.
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The impact of the shard against the glass creates a tiny structural failing which rapidly spreads the tension through the rest of the screen causing it to break.