Is Pyrex Oven-Safe?

And what you should never do while heating it.

August 31, 2022

Related To:

Homemade freshness beef lasagna in a casserole

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Homemade freshness beef lasagna in a casserole

Photo by: Elizabeth Fernandez/Getty Images

Elizabeth Fernandez/Getty Images

By Layla Khoury-Hanold for Food Network Kitchen

Layla Khoury-Hanold is a contributor at Food Network.

You may recognize the name brand Pyrex from the cookware aisle or perhaps you’ve snagged vintage versions of the glassware at a garage sale and wondered—is Pyrex oven-safe? We consulted an expert at Pyrex, Raul Ruiz, SVP, Global Housewares and Modern Design Business Unit, Pyrex, Corelle, CorningWare, Snapware, to bring you the answer – plus proper usage and safety guidelines for using Pyrex in the oven and microwave.

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Photo by: Sinan Kocaslan/Getty Images

Sinan Kocaslan/Getty Images

What Is Pyrex?

Pyrex is a brand of glass cookware that has been manufactured since 1915. It was first manufactured by Corning and made using borosilicate glass, which made Pyrex thermal shock resistant.

As the origin story goes, in 1908, Corning Glass Works started making its own proprietary type of borosilicate glass known as Nonex. The thermally resistant “non-expansion glass” was used for railroad signal lanterns and other industrial applications. This clear glass found its way into the kitchen through Corning employee Jesse Littleton. He brought a sawed-off battery jar home to his wife Bessie, and she used the shallow mold to bake a cake. Corning capitalized on the idea that the domestic sector could benefit from the glass’s durability, and by 1915, it was selling Pyrex, a line of pie plates, casserole dishes and bakeware.

Throughout the years since, Pyrex has been produced in both soda lime and borosilicate glass. Today, Instant Brands continue to produce Pyrex branded glass kitchenware products using both materials.

This photo shows a Christmas ham that is sliced and put on a serving dish. The cooked ham is in a pyrex serving dish and has bowls of berries and a plate of cheese in the background. The table is brightly lit and covered with a festive Christmas tablecloth with a holly and berry design. A nice and healthy eating food shot with holiday motives. - A great shot for preparation cookbooks, ingredient, catalogs, chef, diet and cooking websites or magazines.

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This photo shows a Christmas ham that is sliced and put on a serving dish. The cooked ham is in a pyrex serving dish and has bowls of berries and a plate of cheese in the background. The table is brightly lit and covered with a festive Christmas tablecloth with a holly and berry design. A nice and healthy eating food shot with holiday motives. - A great shot for preparation cookbooks, ingredient, catalogs, chef, diet and cooking websites or magazines.

Photo by: OKRAD/Getty Images

OKRAD/Getty Images

Can Pyrex Go In the Oven?

Yes, Pyrex can go in the oven. You can use Pyrex glass cookware to cook, bake, warm or reheat food in pre-heated conventional and convection ovens.

To What temperature Is Pyrex Oven-Safe?

Pyrex is oven-safe up to 425 degrees. However, direct contact with heating elements can cause the glass to shatter or break. Pyrex is not oven-safe when used under the broiler or in a toaster oven.

Rules for Using Pyrex In the Oven

Uneven heating, direct contact with heating elements and sudden temperature changes can cause glass to shatter or break.

Always Preheat Your Oven Before Putting Your Pyrex Dish Inside

While the glass is designed for temperatures typically used in baking, it can break when exposed to the direct heat element while the oven is preheating.

Don’t Subject Glass to Direct Heat

Shattering can also occur if you use Pyrex with direct heat sources. Do not use Pyrex glassware on the stovetop (either an open flame or electric burner), under the broiler, in a toaster oven or on a grill.

If Cooking Items that May Release Liquids…

Before cooking items that might release liquid, such as fat, food juices or moisture from frozen foods, add a small amount of liquid to cover the bottom of the Pyrex dish before putting it in the oven. This helps minimize any sudden temperature change that may occur as the food releases liquid.

Don’t Add Liquid to a Hot Pyrex Dish

Once a Pyrex dish is hot, don’t add liquid to it, such as basting with liquid that’s not already in the dish. Adding liquid to hot glass can compromise the product’s strength and potentially cause it to break.

Avoid Placing a Hot Pyrex Dish Directly On a Countertop or Wet, Cool or Metal Surfaces

Place hot Pyrex cookware on a dry cloth or potholder, or on a wooden trivet or cooling rack.

Allow Pyrex to Come to Room Temperature Before Changing Its Temperature

This goes for transferring Pyrex from the fridge or freezer to the oven, or vice versa. Allow Pyrex to come to room temperature before immersing in water or placing in the freezer, refrigerator, microwave or pre-heated oven.

Vegetable Lasagne in a casserole dish.

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Vegetable Lasagne in a casserole dish.

Photo by: Alphotographic/Getty Images

Alphotographic/Getty Images

Is Pyrex Microwave Safe?

Yes, Pyrex is microwave safe. But be sure to check the manufacturer guidelines for your particular product.

Don’t use Pyrex to Microwave Popcorn or Heat Foods In Browning Wrappers

Microwavable popcorn bags and browning wrappers are specially designed to concentrate heat in targeted spots and may damage the glass.

Don’t Overheat Oil or Butter

When heating oil or butter in the microwave, heat only for the minimal time required.

Don’t Heat Empty or Nearly Empty Glass Containers In the Microwave

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