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www.reddit.com/.../comments/2w7ken/why_does_a_piece_of_a_sparkplug_work_so_well_at

Physics Why does a piece of a sparkplug work so well at breaking car glass? Why does a piece of a sparkplug work so well at breaking car glass? (self.askscience) submitted 4 years ago by ... So in the case of the spark plug shard, which is made from a hard ceramic (likely an alumina based material) the impact from the ceramic is enough to form ...

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

Tiny shards of spark plug porcelain have small hard points which allow them to easily find a breaking point in glass. 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.

ask.metafilter.com/12309

How and why do spark plug pieces break car windows so easily? ... I suppose even a rock doesn't have the overall density of a spark plug, unless it happened to be a lead rock, or iridium. Exactly. Ceramics can be HARD. Knifemakers have experimented with ceramic blades that go off the metal hardness scale. ... Glass or ceramic doesn't have much ...

www.ebay.com/sch/i.html?_nkw=glass+spark+plug

8X 1200° Glass Fiber Spark Plug Boot Heat Sleeve Protector Covers Case SBC BBC See more like this. SPONSORED. ... VASELINE URANIUM GLASS SPARK PLUG BARNEY GOOGLES HORSE (( ID133214 )) $9.95. or Best Offer +$6.95 shipping. 2 Watching. Vintage Champion Spark Plug Mug Clear Etched Glass Logo Cup Tankard Automotive.

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

Physics Why will a piece of ceramic break safety glass, ... Why will a piece of ceramic break safety glass, but a similar sized rock just bounces off? (self.askscience) ... 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. This is a myth.

www.reference.com/vehicles/break-window-spark-plug-bf6745278a448dab

In order to break a car window's tempered glass, the porcelain insulator inside of a spark plug can be used. Unglazed porcelain is rated 7 on the Mohs scale of mineral harness, while glass is rated 5.5. To shatter a car window with a spark plug: Obtain the spark plug's insulator; Spark plugs generally use a porcelain insulator.

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.

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

I look at the top 3 best emergency window breakers for cars. ... As well as a built-in a hammer, many glass breakers also incorporate other survival tools. A seat-belt cutter, for example, will enable you free yourself and others quickly. ... Who wants to walk around with spark plug pieces in their pants. phoophan . 2 years ago.