this post was submitted on 03 Jun 2024
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Also has led to a vibrant market for old Pyrex, made with borosilicate before they switched to soda-lime. Borosilicate is generally much more resistant to thermal shock (though there are some advantages to soda lime, but the big reason is that it's cheaper)
I discovered the difference the hard way in college when I shattered a pyrex measuring cup by pouring boiling water into it. Four cups of boiling water and glass shards everywhere!
Look for PYREX, not pyrex. They switched over in the 1990s, but sometimes you can get lucky at thrift stores.