Check the inside edge of the frame for a screw or burr that may have
stressed it on the small edge.
Tempered glass is more sensitive to strikes/stress from the edge than
I replaced a pane in a commercial window one time, the screws that
held the frame together were so close to the glass that the second the
screw thread touched the edge as I put it back together, it
shattered. I probably could have thrown a baseball at this glass head-
on and not broken it, but the smallest concentrated inward pressure at
the edge will shatter the whole pane.
I've seen it happen with pinball machine playfield glasses. They can
take a heck of a smack of the steel ball hitting them from the inside,
people smacking their beer down on the outside, etc, but lean one
standing on edge against the wall and a grain of sand on the floor can
cause it to shatter into tiny shards.
The grain of sand comment it true; based on lessons taught to me. Any
little nick on the edge of tempered glass may cause the glass to
A good reason why glass companies use rubber pads during transport to
The windshield on my older car broke twice from a very small point of
rust on the frame. This
occurred, beginning with a crack that slowly extended, twice within a
year. On the second
repair, the installer found the cause and corrected it.
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