Can you microwave glass Pyrex?

  • By: Emma
  • Date: December 2, 2022
  • Time to read: 3 min.

I’m sure you’ve all been there. You’re in the middle of cooking a delicious meal when you realize you’re out of one of the key ingredients. So, you improvise.

Can you microwave glass Pyrex? I’m going to investigate whether this is a safe cooking method so that next time, you know what to do when you’re in a pinch.

Can you microwave glass Pyrex?

Pyrex can be placed in a microwave because Pyrex uses borosilicate to make its glassware. Borosilicate glass consists of 70-80% of Silica and 8-12% of Boric acid, making this glass heat and shock-resistant. Pyrex can be heated up to 5500F. This makes it even more rigid and durable than other oven-safe glassware brands.

Types Of glasswarePyrexGlassPorcelain
Temperature range (oF)450-914300-380500-572
Active compoundSiO2/ H3BO3Soda ash/ limestoneKaolin/feldspar/Clay
Thermal shock resistanceYesNoNo
Chance of ExplodingNoYesYes
Table 1: Comparison of properties and shock resistance of different glassware.

Can you microwave pyrex out of the fridge?

The answer is yes, but you should keep a few things in mind. First, ensure the Pyrex dish is completely cool before putting it in the microwave. If it’s even slightly warm, it could shatter.

Secondly, don’t put the Pyrex dish on full power. Microwave it on a lower setting for a minute or two first, then check to see if it’s warmed enough. If not, give it another minute or two on lower power.

If you follow these simple guidelines, you’ll be able to safely reheat your food in a Pyrex dish without any problems.

What is Pyrex?

Pyrex is a special type of glass that is used for a variety of purposes. It is made from borosilicate, a kind of glass containing Boron. Pyrex is known for its strength, durability, and ability to withstand extreme temperatures.

Pyrex was first created in 1915 by Corning Glass Works. It was initially designed for laboratory equipment and later adapted for cookware and bakeware. Today, Pyrex is one of the most popular brands of cookware and bakeware in the world.

There are many benefits to using Pyrex cookware and bakeware. One advantage is that it can withstand high temperatures without breaking or shattering. This makes it ideal for cooking and baking food at high temperatures.

Does pyrex contain any toxic substances?

In recent years, there has been some concern over whether microwaving glass Pyrex dishes could release toxic substances into food. While it is true that Pyrex is made of silica and other materials that can be harmful if ingested, there is no evidence to suggest that these substances are released during microwave cooking.

I searched eight databases of scientific research papers, including Google Scholar, ScienceDirect, and Springer Journals, to see if an authentic study was published on this subject. Still, none could indicate if pyrex had toxic substances in it.  

So, what does this mean for you? If you are concerned about the safety of microwaving Pyrex, avoid using it for foods that will be in contact with the glass for extended periods. Otherwise, feel free to use your Pyrex dish as usual – knowing that it won’t leach any harmful toxins into your food.


To conclude, yes, you can use pyrex in a microwave. Pyrex can be heated up to 5500F. Pyrex is a type of glass that is often used in cooking. It is heat resistant and can be used in the oven or microwave. Pyrex is safe to use in the microwave if placed on a microwave-safe plate or trivet. If you are unsure if your Pyrex is microwave safe, you can check the bottom of the dish for a symbol indicating it is safe to use.


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