"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.