Re: Brand Other Than Pyrex

On Feb 6, 9:51 am, Chemiker <prussianblu...@xxxxxxxxxxx> wrote:
On Fri, 06 Feb 2009 08:57:26 -0600, Melba's Jammin'

<barbschal...@xxxxxxxxxxxxx> wrote:
In article <485-498BC28B-1...@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
Tonya_...@xxxxxxxxx (ms. tonya) wrote:
Pyrex is not supposed to be used on top of the stove and/or over direct
heat.  See this:
<http://www.pyrexware.com/index.asp?pageId=104
Hmmm, I DO still have my Pyrex glass double boiler for use on a
stovetop.  I wonder why that was okay for that use.  Might have to look
into that.

Corningware used to be made of something called "pyroceram,"  and they
used to make a line of stove-top-safe saucepans and skillets, IIRC.  
http://www.epinions.com/content_4704804996

IIRC, Pyrex owes its reputation for durability to its lower level of
expansion under heat. Old glass was so-called soda-lime glass,
and expanded easily under heat, which was self-destructive.
The addition of borosilicate salts to raw glass lowered the coef.
of expansion, which made the glass more resistant to thermal
shock. It still has limits. I think Fire-king and Pyrex are about
equivalent. Kimble glass calls their product Kimax.

Corningware is a different breed of cat. It is fired at ungodly
high temps and acts more like porcelain. It is thermally VERY
stable and can take thermal shocks that would cause Pyrex to
shatter.

HTH

Alex, Chemiker
===================================
What about those top-of-the-stove glass saucepans in the pictures with
the metal pot melting inside? Can't remember the brand - they were
amber or cranberry colored glass.

I have had better luck with Pyrex and Anchor than clear Corningware.
Remember those glass cylinders for baguettes and the glass souflee
dishes? Broke two of each before I gave up on them.
Lynn in Fargo


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