The Pyrex Glass Controversy That Just Won't Die (2019)
gizmodo.com
gizmodo.com
Personally I suspect that they phased out borosilicate glass in pyrex cookware between 2006 and 2009 and the lag in my ancedata is from slow stock turnover at the local supermarket. This would line up with the exploding glass incidents cited in the article.
What may be a more plausible explanation to the exploding pyrex mystery is the proliferation of marble and other cut rock countertops. These countertops have a very high thermal mass and placing a just out of the oven casserole dish on them, even if completely empty, will most likely cause it to shatter from the rapid cooling of the base.
So, as a kitchen safety tip, don't put hot glassware directly on countertops, use a trivet, dry kitchen towel or potholder.
It's hit or miss but the loss of trust and goodwill occurred and hasn't been reversed. It's safer to not buy their new stuff so to not reward them for resting on their brand laurels. There are plenty of old and other borosilicate products to avoid them.
For example, they used to provide these excellent "Ultra" lids for their products to replace the terrible plastic lids that constantly break and crack. But, they have slowly been phasing them out and only have a few sizes remaining: https://corelle.com/products/pyrex-r-ultimate-white-lid-for-...
We have stainless steel containers that we use too but those are obviously more annoying because they can't be microwaved at an office/school/etc.
It is really a head scratcher that it is so hard to find quality food storage in 2025.
Anything that seems basic that we cannot master in <current year>, especially if we already mastered it, can usually be explained by a desire to increase profit margin.
For example: many often lament washers and dryers of yesteryear, but those appliances cost ~$3000 each after inflation in their respective time periods. Even Speed Queen, which is made in the USA and often touted as being high-quality, doesn't cost as much.
Europe/Russia and Nordic countries have more similar bakeware to the US, but since that's not how I normally cook, I'm not as familiar.
I also have friends who are ceramicists, so if you have access to any, you could ask them what they'd charge for some custom glazed earthenware.
We're living in a disposable society. As companies have found out. its better to sell something that lasts for a few years and then (as you have pointed out) force your customers to buy a replacement or a "new and improved" version.
I remember growing up durability and longevity was always a part of the marketing of specific products. I vividly remember in the 70's watching commercials for cookware and the tagline that was used was, "The last mixer you'll ever buy!" or "Commercial grade blender! The blender that your children will use!" that sort of stuff. Nobody really touts the durability or longevity of their products any more.
Consumer-grade stuff is a waste of time for several reasons, but in-particular the lack of standardized sizes. When I do catering and people ask about food storage I recommend those wide-mouth glass jars and 4-inch 1/9th and 6-inch 1/6th pans, and standardized baking sheets (1/2 and 1/4 sizes mostly) with re-usable lids.
About the only negative is that they sweat a lot in hot weather if you keep cold drinks in them, but it'd probably be easy to make some kind of insulated caddy for them.
I like their glass containers but prefer not having to worry about them shattering.
-- The good borosilicate glass is branded with uppercase "pyrex" -- The potentially bad soda glass is branded with lowercase "pyrex"
There are other clues too, like that the borosilicate ones aren't typically sold in the US, ergo typically aren't marked with imperial units, but if you're on the prowl for one or the other, upper/lower case is the surest giveaway
(unless there are some counterfeits I have not knowingly encountered)
After you have handled both kinds of glass it is difficult to confuse them, especially in bigger vessels.
Besides the fact that borosilicate glass has a lower density, the vessels made of borosilicate glass are made typically with thinner walls than those made of normal glass, which makes even greater the weight difference.
I just wasn't savvy to this knowledge when I was shopping for them on the internet until I dove deeper
Protip: Look for all-caps PYREX graphics which can either indicate that is vintage or that it’s from Europe, where a company called Arc International owns the Pyrex brand and still makes its cookware out of borosilicate.Thanks for the correction!
Lab reagents are much less likely to contain sand grains so it won't happen there.
* https://www.allrecipes.com/article/what-is-the-difference-be...
The article gives me some hope, I'll have to check if I've got proper pryex or expensive clear serving trays.
That's when we dug into it. Now we have a bunch of PYREX that we've picked up up second-hand.
And we don't let it touch the sink after the oven. :)
It makes me wonder how glass cooktops avoid this problem. They have enormous uneven heating stresses every time they are used, and somehow manage to avoid flying apart.
* https://www.duralexusa.com/collections/duralex-bakeware
* https://old.reddit.com/r/BuyItForLife/comments/4gxf5w/found_...