I have this habit where every morning I cook two fillets of tilapia for breakfast. I've been doing it every morning for over a year now.
I do the cooking directly on the plate I'm eating on. I'll rub some avocado oil on a plate, put the two fillets on it, season it, and put it in the oven just like that. When it's ready I put the plate on the table (with a wooden shim below the plate so the heat won't damage the table) and I eat directly from the plate. Not having to wash an extra dish every day means a lot to me.
I've been using plates made from porcelain and ceramics. Slowly over this time they've been breaking. So I ordered some plates from Amazon:
These are made from an advanced material called Vitrelle, a complex glass-like material. They're completely white with no markings, and they're marketed as oven-safe. I cooked my tilapia in them a couple of times and they didn't break, so that's good. But then I thought to call Corelle and ask them to what temperature these plates are oven-safe. I spoke to the Corelle representative and he said the plates are oven-safe up to 176 degrees Celsius. (That's 350 Fahrenheit.) But I cook my fillets at 250 degrees Celsius (which is 480 Fahrenheit.) I could cook them at a lower heat but then they'd take longer to cook and I don't have much spare time in the mornings.
Now of course, just because he said they're only safe up to 176 degrees doesn't necessarily mean they're not safe at 250 degrees. Maybe they are but the company doesn't want to take responsibility for that since most people won't check that when buying the product, so maybe it's just a cover-your-ass policy.
My question is: Do you think it's safe to cook in Corelle plates on 250 degrees Celsius? I'm only concerned regarding health issues, I'm not concerned about the plates breaking at all, because if they break it's something I can see and deal with, while if the plates are releasing toxins into my food and damaging my health, that's something I can't detect. I'd appreciate responses from people who have professional knowledge of these issues, not laymen like me who use common sense.