You're using your Pyrex wrong—here's how to cook with it the right way
There are reports of the glass dishes exploding in the oven.
Recommendations are independently chosen by Reviewed’s editors. Purchases you make through our links may earn us a commission.
There's nothing more comforting than my mom's chicken divan casserole, baked to crispy golden perfection and full of creamy, cheesy deliciousness. And I've recreated it many times (although it never tastes quite as good as hers) in the same 13x9 Pyrex dish she always used.
But according to some experts, that trusty glass casserole dish might not be the best—or safest—option for baking in the oven. In fact, there have been a few reports of Pyrex exploding in customers' ovens (yikes!). Here's what you need to know about the popular glass cookware and how to use it smartly and safely.
What happens when Pyrex goes in the oven
Pyrex is made of glass, which can experience thermal shock when it's exposed to sudden temperature swings. And that thermal shock can make the glass expand and contract, making the dish shatter or explode if the change in temperature is extreme enough. On its website, Pyrex cautions, "Uneven heating, direct contact with heating elements, and sudden temperature changes (hot glassware coming in contact with something cool or wet, or cold glassware coming in contact with something very hot) can cause glass to shatter or break."
Here's a fun fact, though: How likely your dish is to break all depends on when it was produced. If your Pyrex was manufactured before 1998, it was made with borosilicate glass, which is specifically designed to be thermal shock-resistant. However, after 1998, Pyrex began being produced with regular soda-lime glass which is not thermal shock-proof. A.k.a. it's much more sensitive to changes in temperature.
How to safely use your Pyrex glass dishes
Even if you have the original borosilicate glass Pyrex, all glass can be affected by extreme temperature changes to some degree. Avoid rapidly moving your Pyrex from hot to cold temperatures (like taking it directly out of the oven and putting it in the refrigerator) or placing it on your stovetop.
Pyrex also recommends preheating your oven before placing the glass dish inside so that it isn't exposed to a big change in temperature and to always let Pyrex come to room temperature before placing it in an oven, freezer, or refrigerator.
What's the best oven-safe alternative to Pyrex?
If you're worried about putting any glass in the oven, consider using cast iron instead, which is a no-fail option. Our kitchen and cooking writer, Valerie Li, says her personal favorite is the Le Creuset Dutch Oven (it's also on our list of the top Dutch ovens of the year). "I love the Le Creuset Dutch oven because of how versatile it is," she says. "I can slow cook meats, make soup, and even bake bread in it. My sourdough bread came out great in the Dutch oven!"