SPALLLLLLLL!

[Skladfin]

... i want one

[L473ncy]

Wow..... Almost noones heard of the cermaic sparkplug thing?

I've known it all my life (well since gr 9), never tried it.

I bet more people here know about the napalm thing with mogas (hmmm I wanna test some 100LL vs regular/bronze mogas) than the sparkplug thing.

I think the theroy behind it is that since glass is liquid (very viscous and slow moving albeit but still a liquid) that it somehow disturbs equilibrium for a second and causes the glass to shatter. Plus if you think about it (well in my mind it makes sense) glass is just molten silica, so ceramic to silica seems like it would "shatter" it.

[Drake]

I know that ceramic is harder (you can scratch glass with a piece of ceramic), might have something to do with it too.

I tried the ceramic thing because I was incredulous (this was way before the days of YouTube -- and yes, it was done legally on an old car an uncle was junking; he's the one who'd told me about it) and it doesn't require all that much effort. I hurled similar sized chunks of gravel at the window to compare with nowhere near the same results. So it's pretty surprising.

[L473ncy]

Also doesn't it only work on certain types of glass? ie. tempered vs non tempered. Safety glass vs. Tin glass.

[Cushak]

Read this on one of the you tube comments, can anyone confirm it?

"The ceramic from a sparkplug attracts negative electrons A cars side or rear window has positive electrons If one were to throw a peice of sparkplug ceramic at a car window the first part of the ceramic that touches the window creates a miner spark explosion which temporarly weakens the glass to an extreme point than the rest of the weight of the ceramic breaks the glass.

You can shatter a car window with a piece of ceramic from a sparkplug about the size of your pinky finger nail. "