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Is Pyrex Oven Safe? How To Use Your Pyrex Dishes Safely

Pyrex is glass cookware that is designed to be oven safe - but you must preheat the oven before putting Pyrex in.

Is Pyrex oven safe? In short, yes. From casserole dishes to pie plates, Pyrex dishes are made to be oven safe (though there are things that can cause even the trustiest of Pyrex dishes to fail!) I have several Pyrex dishes in my kitchen today that have served me well for many years! 

Glass bakeware like Pyrex is easy to clean, heats evenly, and allows you to see exactly how your food is cooking, and those qualities have made glass cookware and bakeware a popular choice for the past several decades. But what is Pyrex, exactly, and how can you be sure you’re using it safely?

That’s exactly what we’ll explore in this post!

What Is Pyrex?

Pyrex is a brand name (like “Kleenex” for tissues) for borosilicate glass, a special type of heat-safe glass developed by Corning Glassware Company all the way back in 1915. Corning has since stopped using borosilicate glass in favor of soda lime glass that’s cheaper to produce, but the original name lives on.

Whether you have a big collection of vintage Pyrex or a few newer pieces of glass cookware, you may have wondered at some point whether Pyrex is really oven safe. The answer is a bit complicated, so I thought we’d explore the question and answer thoroughly in this post.

Pyrex is oven safe at temperatures normally called for in recipes, according to the company.

Is Pyrex Oven Safe?

The short answer to this question is “yes!” Regardless of age, Pyrex bakeware is safe to use in your oven (and microwave) as long as you avoid sudden and dramatic temperature changes. But as with almost anything else that’s made of glass, there are few finer details worth knowing in order to use it safely and effectively.

Glass can't handle sudden changes in temperature, so Pyrex cannot go from freezer to oven or vice versa.

Can Pyrex Go From Freezer To Oven? 

As I mentioned earlier, modern Pyrex is made of soda lime glass that can tolerate both hot and cold conditions well. However, soda lime glass isn’t quite as resistant to thermal shock as the old borosilicate glass. (“Thermal shock” occurs when a material cannot tolerate sudden exposure to a dramatically different temperature.)

Sudden temperature changes are the enemy of glass, including Pyrex glass. There are plenty of anecdotes and horror stories you can read online about Pyrex glassware cracking, shattering, or even exploding, and many of those instances were likely the result of thermal shock having compromised the integrity of the glass.

So no, you can’t take Pyrex out of your freezer and put it right in the oven. 

Other temperature change scenarios can be problematic too. For example, it can also be unsafe to take hot glassware out of your oven and set it on a wet countertop. A thin layer of water on a countertop can be cool enough to result in the type of thermal shock that can shatter Pyrex.

If your Pyrex has been in the fridge, allow it to come to room temperature before putting it in the oven.

Can Pyrex Go From Fridge To Oven?

That would be a “no”. Rather than taking a Pyrex baking dish out of the fridge and putting it into a hot oven, take it out of the fridge and set it on your countertop for 30 minutes or so to warm up. (Your fridge keeps things at around 40 degrees, and putting glass that cold in a hot oven is just asking for trouble!)

Other Pyrex FAQs

Most people feel comfortable trusting Pyrex at temperatures up to 400°F.

Can You Bake With Pyrex?

Pyrex is great for baking! I’ve made pies, cakes, rolls, and casseroles in my Pyrex baking dishes for years with great results. According to the manufacturers, Pyrex is safe to use at any temperature called for in baking recipes, assuming your oven is pre-heated and the food and Pyrex dish are at room temperature. (To err on the side of safety, I’d suggest using a different type of bakeware if you’re cooking or baking something above 400°F.)

If your Pyrex dishes have plastic lids, don’t put those in your oven. Silicone and glass lids are often oven-safe though, so be sure to check the small print on your lid to know for sure.

Is Pyrex Microwave Safe?

You can use Pyrex in the microwave, but don’t use it to microwave popcorn or heat foods in browning wrappers. (Those bags and envelopes are designed to concentrate heat in a small area, which is bad for Pyrex.) Also, avoid microwaving empty or mostly empty Pyrex dishes. If you’re melting butter in a Pyrex dish, don’t microwave it any longer than you absolutely have to.

Is Pyrex Dishwasher Safe?

Yes, virtually all Pyrex is dishwasher safe. You can load it into the top or bottom rack — anywhere where it won’t come in contact with a heating element. If you accidentally burn or scorch something in one of your dishes, be sure to check out my advice on removing stains and burnt foods from pots and pans!

Below, I’ve included a few other guidelines that will help you use your Pyrex dishes safely.

When you take Pyrex out of the oven, place it on something dry, and not on metal or right on the countertop.

5 Tips For Using Pyrex Glassware Safely

1. Always Preheat Your Oven First

Ever wondered why some Pyrex dishes say “preheated oven only”? That’s because Pyrex is oven safe as long as you preheat the oven before putting it in. (This might sound counterintuitive, but according to the Pyrex website, the direct heat during preheating can lead to breakage.)

2. Avoid Your Stovetop

Pyrex may be oven safe and microwave safe, but it isn’t designed for for use on direct heat sources. Do not use Pyrex on your stovetop (gas or electric), under the broiler, in a toaster oven, or on a grill.

3. Be Careful With Liquid

When cooking foods that may release liquid (ex. fat, juices, moisture from frozen foods), add a small amount of liquid to cover the bottom of the Pyrex dish putting it in your oven. This will help minimize temperature changes from the liquid as it releases during cooking.

Also, don’t add liquid to hot Pyrex dishes, and don’t handle hot glassware with wet oven mitts or potholders. Make sure your oven mitts, cloths, and trivets are completely dry to avoid any potential issues with cracking or breaking.

4. Set It On Cloth Or Wood

When you take a hot Pyrex dish out of your oven, be sure to set it down on something safe, like a dry kitchen towel, a dry cloth potholder, a wooden trivet, or a cooling rack. Don’t place hot Pyrex directly on wet, metal, or cool surfaces of any kind.

5. Let It Come To Room Temperature

Whether you want to store leftovers in the fridge or bake something that has been chilling, always allow time for a glass pan come to room temperature before exposing it to a hotter or colder environment. It may take more time, but that’s the point — a slow temperature change is a safe one, and one that won’t involve cleaning up shards of glass!

Be careful not to hit Pyrex too hard with metal utensils or the kitchen counter. If your Pyrex has a chip or crack, retire it immediately.

The Takeaway

In case you haven’t heard it enough, the main takeaway here is to be gentle when it comes to heating and cooling Pyrex. Shocking the glass with rapid changes in temperature can lead to cracking or breaking, and no one wants that!

Another thing to watch out for is hard bumps. Pyrex is glass, after all, and it can break if it’s dropped or knocked against a hard surface. And if your Pyrex does develop a chip or a crack, be sure to retire that particular dish ASAP, as any defect can lead to breakage down the road.

Do you use Pyrex dishes in your oven at home?

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  • Several years ago I had a pyrex baking dish that once belonged to my grandmother. It had seen LOTS of use and was crusted with burnt on bits. I accidentally left it in the back of the oven when I turned on the self-cleaning feature and realized this mid way through the oven cleaning cycle. I fully expected that I had ruined the oven and the dish would now be a blob of glass stuck to the oven floor. I got the surprise of my life when I was finally able to open the oven and the dish came out looking brand new – no more baked on bits, they had burnt off along with the rest of the gunk in the oven. I don’t recomend this as a cleaning strategy but I was happy with the outcome.

  • Hi-
    I LOVE Pyrex. I even have Pyrex pots. I have never had a problem with them.
    You can see how your recipe is cooking and your can throw them into the dishwasher. And they are reasonably priced. EBAY!
    They got a bad rap in the 70’s because drug users were using them to process drugs and to stop it the gov put a cabach on Pyrex. Weird, but that’s gov for you.
    It’s truly a wonderful product!

    Joan

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