this post was submitted on 20 Oct 2024
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They are amazing. I can see what's happening without removing the lid. They are shock resistant so you can take it out of the freezer and put on the stove.
The actual material is called pyroceram and it has been used in the defense and aerospace industry. It van take a massive beating and is very resistant to shattering.
I believe it's also the same type of glass that's used on a lot of electric stoves, so it can definitely withstand extreme heat shock.
Though, even knowing that, I'd still be (irrationally) afraid to use these, only because of some bad experiences with some "shatter-proof" Pyrex glassware in the past.
Pyrex is fraud!
I bought two Pyrex bowls and went to a glass blower to get them modified. The first one shattered and the glass blower then looked at both of them under polarized light: they both showed strong signs of internal stress. The glass blower was really angry and accused the producer of cheating, because the color was also a slight green, which meant iron was in there, which should not be the case. According to the glass blower in the professional line Pyrex seems to be worth something, but for normal customer? Not really.
There's a cool thing where pyrex, Pyrex, and PYREX are all different kinds of glass, age only one of them is the really good scientific-grade glass.
Oh, that might explain it then. Strange that the glass blower didn't know that.
Only PYREX is the original borosilicate glass. The other two are made with soda lime glass by a different manufacturer.
It isn't glass. It is a composite material
Those two aren't mutually exclusive.
In fact, Pyroceram is according to Wikipedia a glass-ceramic.
It is a glass which has a special composition and was heated so much, that it loses some part of its glass character but retains some other. So calling it a glass is not wrong.