The ceramic stones are actually ceramic shards that come from spark plugs.
Ceramic spark plug break window.
Ninja rocks are broken shards of spark plugs that are formed by smashing the ceramic portion of the spark plug with a hammer or other large object.
Although effective spark plug fragments will not work all the time.
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I wouldn t say breaking the car window with a plug is quiet.
While i have seen other people using the whole plug you only need the spark plug insulator the ceramic part.
We had to give it a shot.
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These broken pieces are what you get when you smash the ceramic part of the spark plug.
In part 1 we learned porcelain from a spark plug can break glass but what about other porcelain like a toilet.
Since they can quickly and quietly fracture the glass side windows on most cars ninja rocks have been used in smash and grab auto burglaries since at least 1995.
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.
Does this only work on auto glass.
An article on the american ceramic society s website explains the hard ceramic fragments of broken spark plugs are great at breaking tempered glass.