In This ArticleView AllIn This ArticleWhat Is “Pyrex”?What Is “pyrex”?What Is “PYREX”?How to Tell the Difference?
In This ArticleView All
View All
In This Article
What Is “Pyrex”?
What Is “pyrex”?
What Is “PYREX”?
How to Tell the Difference?
Close
Photo: Getty Images and Manik Roy/Unsplash
Pyrex containers are a staple in many kitchens. I grew up baking casseroles in the containers and warming up leftovers in the microwave. So, when I found out that there is a difference between the products labeled “PYREX” and “pyrex,” my head immediately started to hurt.
Facebook pages, TikTok and Reddit threads are teaching us that the difference between “PYREX” and “pyrex” is super important to understand in order to keep your food safe and containers in good condition.
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Little-p pyrex is probably what your kitchen’s measuring cups, meal-prep containers and drinkware are made from. It’s crafted fromsoda-lime glass, one of the most common types of glass produced commercially. Soda-lime glass is less expensive because it’s not as heat resistant. In fact, it’s used for products like light bulbs and some beverage bottles because of how easy it is to mold into shape while hot.
Since, pyrex (emphasis on the lowercase letters) is mostly made from soda-lime glass, it is definitely not recommended for use in the oven or microwave. Somesocial media usershave even shown instances of their pyrex containers blowing up in the oven.
PYREX (in all uppercase letters) is made ofborosilicate glass, which is much more heat-resistant and durable than other kinds of glass. That makes this a good material for making cookware and microwaveable containers, plus you can feel safe adding hot liquids to measuring cups made from it or using those measuring cups in the microwave.
Composed of silica and boron oxide, borosilicate glass is much more suited for high-heat cooking. The boron oxide in the glass strengthens and reinforces the chemical structure of the glass, making it especially tough against high temperatures. Borosilicate glass was the original material Pyrex used to make its cookware, and many of the brand’s products are made of the glass today.
The next time you go to cook dinner in a Pyrex pan, take a look at the labeling. Cookware with lowercase logos are usually made of soda-lime glass and should not be heated up in the oven or microwave to minimize risk of them breaking. Cookware with logos in all-caps are typically made of borosilicate glass and can be heated at high temperatures without harm.
The Bottom Line
Pyrex is a household name, and lovers of the classic cookware can rest easy tonight knowing how to avoid glass in their delicious pan of brownies. To help you keep all the different variations and definitions of this cookware lesson, here’s a cheat code:
To ensure that your kitchen stays safe and your cookware stays in one piece, never put pyrex or PYREX under a broiler because the intense heat may fracture the glass. You should also let refrigerated glass sit at room temperature for 30 minutes before putting it in the oven. Pyrex containers of all kinds are best for food storage, and cooking your meals in oven-specific cookware is always a good practice.
So now that you understand the differences between the home cook’s favorite cookware, get cooking everything fromlasagnato ourDeep-Dish Apple Pie. With the right kind of container, of course.
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