Arri London wrote:
>
> "Jean B." wrote:
>> Arri London wrote:
>>> Goomba wrote:
>>>> Chemiker wrote:
>>>>
>>>>> Some posters said that certain manufacturers had stopped producing
>>>>> their wares in Borosilicate Glass and went back the the cheaper Soda
>>>>> Lime glass, which does not tolerate temperature changes as well.
>>>>> Worthy of note is that the Anchor Hocking company is named among the
>>>>> guilty, as well as World Glass, who apparently bought some of
>>>>> Corning's Pyrex plants (if I understood the article properly).
>>>> FYI-
>>>> One of the best places around here to get the old classic borosilicate
>>>> glass cookware are the antique/junk type shops. Often at a remarkably
>>>> low price! If anyone wants to find some, that's the place to go!
>>> Just be cautious and inspect the items carefully. There's no way of
>>> knowing the history of any piece. Certain stresses/types of damage can
>>> cause the cookware to fail unexpectedly. Might be wise to stay away from
>>> any piece with nicks or scratches.
>> Also, there is no way of knowing how old much of the stuff in such
>> stores is. Sure, I assume such cookware with certain designs stem
>> from before this was an issue, but the plain things?
>>
>
> Sometimes it's obvious from the design...the overall shape, especially
> the handles. Some of our older Pyrex is thicker/heavier than the same
> diameter pieces now available. And our Corningware is all 'cornflower'
> design. The all-white styles are a bit more recent.

Yes, the cornflower design and some others stand out and are old.
So ALL of the white Corelle was produced after the change? I
obviously need to look into Pyrex (especially). I have quite a
lot of it, old mixed with newer, and I have NO idea what vintage
much of it is!

--
Jean B.