Ok, so say someone had a Pyrex-type glass casserole dish on the stovetop when the wrong burner was accidentally turned on and this caused the Pyrex dish to be heated on the burner even though it specifically forbids such use. The dish survived the initial trauma. Do I need to watch it for future problems or am I home free? Its in the dishwasher now and I haven’t heard any shattering noises but I would hate for it to blow up in the oven when I am making another lasagna.
I think it will be OK, I’ve actually made gravy in a pyrex baking dish over a burner and gotten away w/ it. I’ve also had one shatter, which is the big danger. (what a mess!)
I would think if any glass dish could take that, it would be a Pyrex. I put a twelve pack of empty beer bottles in a hot camp fire once. They didn’t break in the fire but, after it cooled down, you could barely touch one with your foot and it would implode. It was pretty cool. I screwed up a ceramic dish doing what you did though and it broke the next time I tried to cook with it.
Perhaps this could cause the bottom of the dish to be under tensile stress. That is, it would try to expand relative to the inside surface above it, but at high temperature it would stress relieve itself. Then you take the dish off which makes that surface contract, but at low temperature it can’t relieve its stress. They use a method somewhat like this to form the curved plates of a steel ship’s hull.
If the dish is now configured this way it could shatter when the bottom gets scratched a little bit. But if that doesn’t happen soon I’d guess it’s OK and use it. Say, if it goes through a few dishwasher cycles.