Is Pyrex Microwave Safe?

Pyrex is a popular kitchenware brand used for cooking, storing, and reheating food. But is Pyrex microwave safe?

This comprehensive guide will answer this question by looking at what Pyrex is made of, the different types available, and how to use it safely in the microwave. We’ll also consider if it’s worth the risk to use Pyrex microwavable products.

See also Air Fryer Pros and Cons: What You Need to Know and Best Biggest Air Fryers 2023.

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What Is Pyrex and Is It Safe for the Microwave?

Pyrex is an American brand of kitchenware that was originally created in 1915 by The Corning Glass Works.

It is made from borosilicate glass, which allows it to withstand extreme temperatures without breaking or shattering.

Pyrex products are made from borosilicate glass, which is a type of glass made from silica and boric oxide.

This type of glass is highly resistant to thermal shock (i.e., sudden temperature changes), making it more suitable than other types of glass for baking dishes and other kitchen items that are exposed to extreme temperatures. As such, it can withstand temperatures up to 500 °F (260 °C). 

As for the question about whether or not Pyrex is safe for use in the microwave oven – the answer is yes!

Borosilicate glass has superior heat resistance properties compared to regular tempered glass, so glass Pyrex dishes are considered safe for use in the microwave oven.

However, you should use caution when microwaving Pyrex dishes; never place a dish directly on top of the turntable plate or any other part of the oven itself as this can cause the dish to shatter due to uneven heating.

Additionally, do not move hot Pyrex dish straight away as they will be extremely fragile until they have cooled down completely.

Types of Pyrex Microwavable Products:

Pyrex produces a variety of microwavable products, including baking dishes, ramekins, storage containers, and cookware.

The most popular type is the classic clear glass bakeware that comes in various sizes and shapes.

Empty oval glass casserole pan on an old rustic wooden surface

Dos and Donts of Pyrex Microwavable Products

Microwaving your Pyrex dishes is a great way to cook food quickly and conveniently. However, it’s important to understand the dos and don’ts of microwaving Pyrex so that you can get the most out of your cookware. Below are the dos and don’t of pyrex microwaving:

Dos of Pyrex Microwavable Products:

1. Preheat Your Dish:

Whenever you are microwaving food in a Pyrex dish, it is important to preheat it before adding anything to it.

Preheating the dish will help keep food from sticking, as well as prevent uneven cooking due to cold pyrex in in the dish itself. To preheat the dish, fill it with water and heat for a few minutes before adding your ingredients. 

2. Know Your Wattage:

Before using your Pyrex dish in the microwave, make sure that you know what your microwave’s wattage is or check on its settings if possible.

Different microwaves have different wattages which can affect how quickly something cooks inside of them. Knowing what your wattage is will help ensure that your food cooks evenly without burning or overcooking. 

3. Use Low Heat Settings:

When heating up food in a Pyrex dish inside of the microwave, make sure to use low heat settings, especially when reheating leftovers as this will help keep your food from becoming too hot too quickly and burning or overcooking it. 

4. Place your dish on a microwave-safe plate or tray

If you’re using a Pyrex dish in the microwave, make sure to place it on a microwave-safe plate or tray. This will help protect your dish from potential damage.

 Don’ts forPyrex Microwavable Products

1. Don’t Use Old Dishes with Cracks or Chips:

It is important not to use any old dishes with cracks or chips when microwaving because they could become damaged further while being heated up and potentially cause harm if pieces break off into the food itself while cooking. 

2. Don’t Leave Unattended Foods Inside of Microwave:

When microwaving anything– including with a Pyrex dish– it is important never to leave it unattended for too long as this could cause problems such as burning or overcooking of foods depending on its wattage settings or other factors such as the size of the container being used inside of microwave itself.  

3. Don’t Place Dishes Too Close Together:

If using multiple dishes at once inside of the microwave, make sure not to place them too close together, as this can cause uneven cooking between them due to their varying sizes.

Additionally, make sure that containers are spaced out enough so that no part of them are touching each other during the heating process.

4. Don’t use metal utensils:

Never use metal utensils to stir, scrape or remove food from a Pyrex dish when it’s in the microwave. The metal could cause sparks which could damage your dish and even start a fire.

5. Don’t heat an empty Pyrex dish:

Never put an empty Pyrex dish in the microwave as this could lead to overheating and potentially damaging your dish.


Q: Is Pyrex dangerous if heated too quickly?

A: Yes, Pyrex can be dangerous if heated too quickly. This is because the glass can become too hot and shatter or crack. To avoid this, it’s important to follow the instructions on the packaging.

Q: Is Pyrex dishwasher safe?

A: Yes, Pyrex dishes are generally dishwasher safe as long as they are not exposed to extreme temperatures.

It’s also important to make sure that you place the dish in the top rack of your dishwasher and avoid using any harsh or abrasive detergents.

Q: Can I microwave Pyrex with a lid on?

Yes, it is safe to use a lid when microwaving Pyrex. Make sure the microwave pyrex lids fit properly and are appropriate for use in the microwave.

Some lids have metal trim or other decorative pieces that may not be suitable for microwaves; these should be avoided when using Pyrex in the microwave.

Q: Can I microwave frozen food in Pyrex?

Yes, you can safely heat up frozen food in a Pyrex dish. Be sure to follow the manufacturer’s instructions regarding cooking times and temperature settings, and make sure there are no metal elements on the dish itself or its lid before proceeding with this method of cooking. 

Q: Can Pyrex explode in the microwave?

No, it is unlikely that your Pyrex will explode in the microwave due to its higher melting point than standard glassware.

However, you should always take extra precautions when using any kind of glassware in a hot environment such as a microwave oven to prevent possible breakage or cracking. 

Q: Can I use Pyrex in the oven and microwave at the same time?

No, you should never attempt to heat both an oven and a microwave simultaneously with one dish; this could increase the risk of breakage due to uneven heating temperatures between both appliances.

You should also avoid using one piece of Pyrex cookware multiple times between different appliances without proper cooling periods first, this could result in thermal shock and cause damage to your cookware as well as potential injury from steam burns if handled without caution afterward.

Close up of glass food containers isolated on white background

Air Fryer Recipes: 

  1. Air Fryer Polenta
  2. Air Fryer Kale Chips
  3. Air Fryer Rosemary Sweet Potato
  4. Air Fryer Squash


In conclusion, Is Pyrex Microwave Safe? The answer is yes but with certain considerations. Pyrex glassware can be safely used in microwaves as long as it is not placed directly on the heating element or subjected to rapid temperature changes.

When using a microwave and oven simultaneously, it’s important to use separate pieces of cookware and allow the oven to preheat for several minutes prior.

Additionally, Pyrex should be regularly checked for signs of wear and tear and replaced when needed in order to ensure proper safety. With thoughtful care and precaution, you can safely enjoy all that Pyrex has to offer in your microwave!

Remember: handle with caution as Pyrex glass may become hot to the touch, so be sure to use oven mitts or potholders when handling.

Additionally, Pyrex should never be used on direct flame or electric burner heat sources, and it is not designed for broiling. Always refer to your specific product’s instructions and warnings prior to use in any appliance.

To wrap up, Is Pyrex Microwave Safe? The answer is – yes! However, always use caution and follow the directions on your specific product to ensure proper safety. With careful handling, you should have no problem enjoying all that Pyrex bowl has to offer in your microwave.

So now that you know Is Pyrex Microwave Safe, go enjoy baking and reheating in no time flat with Pyrex!

Happy cooking!

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