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www.reference.com/vehicles/spark-plug-porcelain-break-glass-1cef09016e3d3e5e

They can also be used to break the side window of vehicles. Spark plug porcelain fragments are sometimes referred to as ninja rocks because of their ability to break glass with ease. Spark plugs are made of aluminum oxide ceramic, which is exceptionally hard.

www.reddit.com/.../comments/1nmeu7/why_will_a_piece_of_ceramic_break_safety_glass

Because of the 'negative charge' of the ceramic - when it meets the window with the 'positive charge' it causes a reaction that dramatically weakens the window, allowing for the ceramic to shatter the window. The hardness of the material helps a little bit, but it is this initial reaction that makes all the difference.

lifehacker.com/shatter-a-car-window-with-a-sparkplug-in-an-emergency-1540780900

Shatter a Car Window with a Sparkplug in an Emergency. Alan Henry ... Brian Brushwood explains in this video that if you break off a chunk of ceramic from around the sparkplug and use it against ...

en.wikipedia.org/wiki/Ninja_rocks

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. 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.

www.backdoorsurvival.com/best-emergency-window-breakers-for-the-unexpected

Question, so these window breakers work on the newer regulated side windows that won’t break, as was the case of the woman in Spokane that almost burned to death when her car stalled, electric caught fire, and law enforcement couldn’t even break the window?

fox4kc.com/2015/07/21/local-glass-shop-gives-tips-on-breaking-windows-to-save...

Local police have responded to incidents of three different children being left in hot cars over the past few days, so Baldi invited FOX 4 out Tuesday for tips on how to break a car window to save ...

axleaddict.com/safety/My-5-favorite-emergency-window-breakers-for-cars

2019's Top 3 Best Emergency Window Breakers for Cars. Updated on June 3, 2019. Paul Goodman. ... Does require some force to break a car window. I know, I've tried it. ... These guys take the pieces of Ceramic and throw them gently against a car window and shatter it the first time and every time. Cheap, easy and safe!

www.amazon.com/AmazonBasics-Emergency-Cutter-Window-Hammer/dp/B073J92G1J

Easily break side car windows with the window hammer’s sharp dual pointed heads. Made of harder-than-steel tungsten metal, the two hammer heads offer reliable strength and fast results. Read more. Seat-Belt Cutter No need to worry about being trapped under the straps of a jammed seat belt. The tool’s sharp blade will cut through a seat belt ...