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Watch Out! You Could Be Making This Dangerous Mistake with Your Pyrex Dish

Reuben Bread Pudding

Pyrex was made to withstand high heat and won't ever shatter—right?

I started using Pyrex glassware before 1998, so I consider the products to be almost miraculously heat-resistant. Back then, you could safely take a dish from one temperature extreme to another—refrigerator to freezer to oven—without having to worry about glassware shattering from the change in temperature. (It’s a phenomenon known as “thermal shock.”) It was a thing of beauty for any home cook who likes to prepare a family-favorite 13×9 casserole on Sunday night, and pop it right in the refrigerator for a weeknight meal.

But what many folks don’t know is that somewhere along the line, things changed, and Pyrex glassware is no longer thermal shock-resistant. If used improperly, the dish can shatter into hundreds of tiny pieces inside your oven—leaving you with a potentially harmful mess. Here’s what you need to know:



The original Pyrex is thermal shock-proof

When Corning started manufacturing Pyrex in 1908, they were using borosilicate glass. That’s what made Pyrex thermal shock-resistant. Until 1998, all Pyrex glassware was made with borosilicate glass. That means that if you have Pyrex glassware made before 1998 (like this gorgeous vintage design), you can safely use it like you always have—making a baked mac n’ cheese casserole and leaving the dish on your cold granite countertop or immediately transferring it to the fridge for tomorrow’s dinner.

The classic Pyrex is one thing you should never pass up at Goodwill—here’s what else you should grab.



Why things changed

In 1998, Corning sold the Pyrex brand to World Kitchen LLC, which stopped using borosilicate glass and started using soda-lime glass, according to Consumer Reports. Soda-lime glass is just ordinary glass. It’s not resistant to thermal-shock, and it could shatter when going from one temperature extreme to another. So if you’ve bought new Pyrex glassware since 1998, it’s important to keep in mind that what you have is ordinary glassware and it needs to be handled with care. Here’s what Consumer Reports recommends:

In other words, easy casseroles can still be your go-to as long as you’re careful with the temperature extremes!

Make these easy casseroles for dinner

Chicken Noodle Casserole

Baked Chops and Cottage Fries

Contest-Winning Broccoli Chicken Casserole

Reuben Bread Pudding

Stuffing & Turkey Casserole

Southwest Vegetarian Bake

Contest-Winning Chicken Wild Rice Casserole

Seafood Casserole

Taco Salad Casserole

Chicken Amandine

Rice-Stuffed Peppers

Chili Mac Casserole

Chicken and Swiss Stuffing Bake

Chicken Tortilla Bake

Sauerkraut Casserole

Artichoke Ratatouille Chicken

Potluck Taco Casserole

Penne and Smoked Sausage

Chicken Enchilada Bake

Tomato, Sausage & Cheddar Bread Pudding

Crunchy Almond Turkey Casserole

Grandma's Rice Dish

Meatballs Sausage Dinner

Corn Bread Chicken Bake

Golden Pork Chops

Chili Tortilla Bake

Mexicali Casserole

Chicken Casserole

Creamy Turkey Casserole

Black Beans with Bell Peppers & Rice

Ham & Cheese Potato Casserole

Turkey & Spinach Stuffing Casserole

Ham 'n' Tater Bake

Taste of Home

TLC (Thanksgiving Leftover Casserole)

Church Supper Spaghetti

Pineapple Ham Casserole

Chicken Zucchini Casserole

Turkey Spaghetti Casserole

Mushroom Chicken with Wild Rice

Creamy Ham & Cheese Casserole

Lauren Cahn
Lauren Cahn is a New York-based writer whose work has appeared regularly in The Huffington Post as well as a variety of other publications since 2008 on such topics as life and style, popular culture, law, religion, health, fitness, yoga, entertaining and entertainment. She is also a writer of crime fiction; her first full-length manuscript, The Trust Game, was short-listed for the 2017 CLUE Award for emerging talent in the genre of suspense fiction.