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Posted by norminn@earthlink.net on November 15, 2009, 2:37 pm
terry wrote:
show/hide quoted text
> Excuse somewhat OT. But knowledgeable group here may be able to help/
> comment.
>
> We have a very shallow ex microwave tray/dish just over 12 inches
> square. Doesn't fit any other m.waves we have.
>
> Moulded into the glass (Which we assume is some sort of Pyrex, heat
> resistant glass?) is "For microwave use only".
>
> Before trying it in a conventional electric oven, anyone have any idea
> why this would not be suitable?
>
> BTW tray does have a slight 'spall' (chip) which might be the point of
> weakness if it does shatter and send burst glass all over the
> conventional oven!
>
> Have never tried it before and after running a small catering/
> cafeteria company for some 30+ years we never did shatter anything in
> a microwave oven.
>
> Thanks for any insight.
In addition to the chip, uneven heating would more likely affect
something that large. You've gotten good tips from others, but my two
cents: Last thanksgiving, hurrying to get the meal on the table, I
moved an empty pyrex pie plate and set it on a burner I thought was
turned off (glass cooktop). Just after we sat down to our meal in the
dining room, the pie plate exploded...there were long, narrow shards of
glass all over the kitchen. Had I not been in a hurry, chances are it
would have exploded in my face.
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Posted by Frank on November 15, 2009, 6:12 pm
show/hide quoted text
> Excuse somewhat OT. But knowledgeable group here may be able to help/
> comment.
> We have a very shallow ex microwave tray/dish just over 12 inches
> square. Doesn't fit any other m.waves we have.
> Moulded into the glass (Which we assume is some sort of Pyrex, heat
> resistant glass?) is "For microwave use only".
> Before trying it in a conventional electric oven, anyone have any idea
> why this would not be suitable?
> BTW tray does have a slight 'spall' (chip) which might be the point of
> weakness if it does shatter and send burst glass all over the
> conventional oven!
> Have never tried it before and after running a small catering/
> cafeteria company for some 30+ years we never did shatter anything in
> a microwave oven.
> Thanks for any insight.
If it takes the stresses of microwave heating it should be suitable in
a conventional oven. Interesting that Pyrex can be conventional glass
which is tempered while the original Pyrex and Pyrex lab glass is
borosilicate glass.
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Posted by Jon Danniken on November 15, 2009, 9:49 pm
Frank wrote:
show/hide quoted text
> If it takes the stresses of microwave heating it should be suitable in
> a conventional oven. Interesting that Pyrex can be conventional glass
> which is tempered while the original Pyrex and Pyrex lab glass is
> borosilicate glass.
Pyrex is a brand name, and they make a number of products, not all of which
are borosilicate. Same deal with Vibram, or Nalgene.
Jon
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Posted by Jim Elbrecht on November 16, 2009, 8:20 am
-snip-
show/hide quoted text
>If it takes the stresses of microwave heating it should be suitable in
>a conventional oven.
I *strongly* disagree with that. Microwave safe is not oven safe.
I doubt the glass would ever reach 200 degrees in the microwave.
Definitely not 350. It is the last thing to heat up and by 250 meats
& veggies would be reduced to un-chewable cardboard & water is vapor.
Have you ever seen an exploding plate? Could happen in the oven, as
you're taking it out, or while sitting on the counter cooling. If you
use it- especially with a chip- please have the digi-cam on at all
times. The video will be as cool as the windmill one.
show/hide quoted text
>Interesting that Pyrex can be conventional glass
>which is tempered while the original Pyrex and Pyrex lab glass is
>borosilicate glass.
Not exactly-
http://en.wikipedia.org/wiki/Borosilicate_glass
Jim
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Posted by Frank on November 17, 2009, 7:08 am
show/hide quoted text
> -snip-
> >If it takes the stresses of microwave heating it should be suitable in
> >a conventional oven. =A0
> I *strongly* disagree with that. =A0 =A0Microwave safe is not oven safe. =
=A0
show/hide quoted text
> I doubt the glass would ever reach 200 degrees in the microwave.
> Definitely not 350. =A0It is the last thing to heat up and by 250 meats
> & veggies would be reduced to un-chewable cardboard & water is vapor.
> Have you ever seen an exploding plate? =A0 =A0Could happen in the oven, a=
> you're taking it out, or while sitting on the counter cooling. If you
> use it- especially with a chip- please have the digi-cam on at all
> times. =A0 The video will be as cool as the windmill one.
> >Interesting that Pyrex can be conventional glass
> >which is tempered while the original Pyrex and Pyrex lab glass is
> >borosilicate glass.
> Not exactly-http://en.wikipedia.org/wiki/Borosilicate_glass
> Jim
Its the uneven heat that stresses the glass - not the temperature.
Borosilicate glass has lower expansion coefficient which makes it more
suitable to take stress. Also there are built in stresses that must
be annealed out of any glass. Don't think it's worth my researching.
OP can do what ever he wants.
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> comment.
>
> We have a very shallow ex microwave tray/dish just over 12 inches
> square. Doesn't fit any other m.waves we have.
>
> Moulded into the glass (Which we assume is some sort of Pyrex, heat
> resistant glass?) is "For microwave use only".
>
> Before trying it in a conventional electric oven, anyone have any idea
> why this would not be suitable?
>
> BTW tray does have a slight 'spall' (chip) which might be the point of
> weakness if it does shatter and send burst glass all over the
> conventional oven!
>
> Have never tried it before and after running a small catering/
> cafeteria company for some 30+ years we never did shatter anything in
> a microwave oven.
>
> Thanks for any insight.