Does this only work on auto glass.
Ceramic spark plug break window.
Although effective spark plug fragments will not work all the time.
In part 1 we learned porcelain from a spark plug can break glass but what about other porcelain like a toilet.
These broken pieces are what you get when you smash the ceramic part of the spark plug.
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.
An article on the american ceramic society s website explains the hard ceramic fragments of broken spark plugs are great at breaking tempered glass.
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They have no traditional association with the ninja or ninjutsu only being named.
Spark plugs are made of aluminum oxide ceramic which is exceptionally hard.
I wouldn t say breaking the car window with a plug is quiet.
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.
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.
When done right the spark plug shutters the glass immediately and since the tempered glass is designed to break with little noise not much noise is produced.