[willglynn]

Corning invented a particular kind of borosilicate glass about a hundred years ago and called it PYREX™. They left the consumer goods market about twenty years ago, divesting the brand. Nowadays that name might refer to either borosilicate glass or to soda lime glass.

[crystaln]

Depending on the capitalization.

The good stuff is PYREX.

[willglynn]

It's not that simple. https://www.snopes.com/fact-check/exploding-pyrex/

> What's Undetermined

> Whether Pyrex switched from using borosilicate glass to tempered soda lime glass only after Corning sold the brand to World Kitchen in 1998.

…

> In a January 2011 article on glass bakeware, Consumer Reports stated that they were unable to determine exactly when major U.S. manufacturers (including Pyrex) switched

[crystaln]

That’s the most amount of word salad garbage I’ve ever seen on snopes.

The government hasn’t determined that soda lime glass is unsafe? Shocking.

I wonder why chemists use borosilicate? Hmm.

[Dan_-]

You can still get it in America from a company called icedteapitcher. It’s the made-in-France true PYREX and is metric.