An article on the american ceramic society s website explains the hard ceramic fragments of broken spark plugs are great at breaking tempered glass.
Ceramic spark plug break window.
The ceramic stones are actually ceramic shards that come from spark plugs.
While i have seen other people using the whole plug you only need the spark plug insulator the ceramic part.
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.
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.
In part 1 we learned porcelain from a spark plug can break glass but what about other porcelain like a toilet.
They have no traditional association with the ninja or ninjutsu only being named.
Does this only work on auto glass.
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.
I wouldn t say breaking the car window with a plug is quiet.
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We had to give it a shot.
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.