NJRVer wrote:
Being tempered glass, if it has even the slightest scratch on it that can lead to it blowing out at any unexpected time. Also, if it was not set into the metal frame properly, as in the frame wasn't square when the glass was inserted, that can also stress the glass and cause it to break.
You can smack the front of a piece of tempered glass with a hammer and it won't break. But if you tap the thin edge it will very easily shatter.
X2,
Wow tow pages before someone explained about tempered glass. It is normally very tough, but can shatter from the slightest tweak in the wrong place.
Glass needs to be cut to size then tempered, once tempered, you can't cut it again as it will shatter. The tempering process places a lot of surface tension in the glass.