Spark plugs are made of aluminum oxide ceramic which is exceptionally hard.
Ceramic break window.
Does this only work on auto glass.
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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.
The ceramic could leave a scratch but that is all that would happen.
Although effective spark plug fragments will not work all the time.
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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.
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.
Once the crack gets started it quickly spreads ceramic stones can easily be concealed by thieves.
The reason is that the small sharp and hard ceramic fragments induce scratches that pierce through the residual stresses of the glass.