Can You Microwave Pyrex? What You Need to Know About Safety

Can You Microwave Pyrex? What You Need to Know About Safety

Are you wondering if it is safe to use Pyrex in the microwave? You may think it’s safe, but the reality is that some Pyrex products should never be microwaved. In this article, we’ll explore why and how to safely microwave Pyrex.


Pyrex is a popular brand of glassware commonly used in baking. It was first introduced in the United States by Corning Glass Works in 1915 and has since become a kitchen staple. The glassware is known for its ability to withstand high temperatures, which makes it ideal for oven and stovetop use.

However, it’s important to understand that not all Pyrex products are safe for microwaving. The heat generated by microwaves can cause the Pyrex glass to crack or shatter, so it’s best to opt for other materials for items you plan on heating in the appliance. If the product does specify that it is microwave-safe, be sure to follow all instructions and warnings carefully when using it.

This guide will explore some of the common uses of Pyrex as well as provide advice on how to safely use your Pyrex product with a microwave oven.

What is Pyrex?

Pyrex is a type of borosilicate glass that was developed by the Corning Glass Works in 1919 for use in laboratory equipment and later for cookware. The main components of Pyrex are quartz, sodium oxide, and boron oxide as well as other minor components.

Pyrex is a very durable glass due to its low coefficient of expansion and can withstand temperatures ranging from -40 to 500C. This makes Pyrex ideal for products such as ovenware, bakeware, dishes and other kitchen appliances. It is also used as lab apparatus and other industrial applications that require a heat-resistant material.

Although it is heat-resistant, it should not be exposed to sudden temperature changes or thermal shock; this could cause the glass to crack or break completely. For these reasons, it is not recommended to put Pyrex in the microwave.

Can Pyrex be Used in a Microwave?

Pyrex products can be used in a microwave oven, as long as certain rules are followed. To start, it’s important to remember that not all Pyrex products are made with the same material and this affects whether or not they can be microwaved safely.

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It is generally safe to use any Pyrex glassware, including pies plates and custard cups, for microwave cooking. However, Always refer to the manufacturer’s instructions for safe use when it comes to cookware made out of other materials such as plastic or metal components.

It is also important to remember that any glass product will become hotter than its surroundings in a microwave oven and extreme caution should be taken when removing these items from the oven and when handing them afterwards. Always refer to the manufacturer’s instructions for specific guidelines on proper handling and storage of your Pyrex products.

Benefits of Using Pyrex in a Microwave

Using Pyrex® glass products in a microwave can offer many benefits for heating, reheating and cookware preparation. Pyrex products are designed with strong, durable glass that provides stability and even heat distribution. This helps to minimize hotspots during microwaving, which can lead to better food results.

The design of Pyrex glassware includes maintained clear transparency that allows you to monitor your cooking progress, keeping you better informed of when the food is complete. If a recipe calls for melting something on top of a dish before baking it in the oven, you can use a single oven-safe dish with a Pyrex product and go straight from the microwave to the oven without breaking down recipe steps or switching dishes. Clean up is easy as most of Pyrex’s range is dishwasher safe for quick cleanup after preparing meals at home.

Another benefit of using a Pyrex product in the microwave is that many items come with lids to provide hands-free and spill-proof operation while heating meals. This prevents ‘splatter’ from your reheated soup or other items in your microwave – ensuring it remains clean after each use. What’s more; unlike plastic containers made for microwaves which often contain BPA and may leach toxins into food when heated, Pyrex glassware does not contain BPA or any other chemicals so you know that what you’re eating hasn’t been exposed to potentially harmful materials.

Safety Considerations When Using Pyrex in a Microwave

When it comes to safety, it is important to remember that Pyrex cookware and other glass products are only suitable for limited use in the microwave. Overheating the containers can cause the material to break or shatter, leading to a potentially hazardous situation. To make sure you safely use your Pyrex cookware in a microwave, here are some best practices:

  • Read the manufacturer’s instructions first. Different types of Pyrex are made of different materials, and there may be special instructions on safe use.
  • Always check for chips or cracks in your container before placing it in a microwave. If there is any damage, do not use the container in the microwave as it may cause splattering or shattering during heating.
  • Do not place empty glass containers in the microwave as they can overheat and break due to extreme temperature variations.
  • Use short heating cycles when microwaving with glassware; this will help prevent heat buildup inside the container which can cause cracking or shattering.
  • Allow food items to cool down before removing them from the Pyrex cookware; this will reduce sudden temperature changes inside of the dish which may crack the glass.
  • Never put metal objects such as forks or knives into a microwave containing Pyrex cookware as this could spark an electrical fire or cause shattering if placed too close to walls of applicance.
  • Always wait for several minutes after taking out food from a microwave containing Pyrex before touching it; this will help ensure that no heat buildup has taken place behind the walls of container which could lead to sudden breakage after contact with human skin.
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Tips for Using Pyrex in a Microwave

Before you use Pyrex cookware in a microwave oven, there are some important tips to consider. Pyrex can be used in a microwave if certain guidelines are followed. The goal is to ensure that the Pyrex does not become damaged by getting too hot or resulting in breakage due to sudden temperature changes.

  • When using Pyrex cookware in the microwave, make sure the oven is not set on high power. This will help promote even heating throughout and reduce the risk of damage from over-heating.
  • Do not leave any piece of Pyrex cookware empty as this can cause it to overheat, leading to breakage. Therefore, it is essential that each container contains some type of food or liquid before microwaving.
  • Additionally, large pieces of solid food should be cut into smaller pieces to promote even heating and reduce cooking times.
  • Finally, it is important when microwaving any item with Pyrex that the lid fits snuggly on top without being overly tight or creating openings through which steam can escape from inside during cooking.
  • To increase circulation within the container and aid in more even-cooking time, piercing foods with a fork may be necessary when reheating prior consumed meals in ice cubes trays or shallow dishes containing little liquid (when possible).
  • When finished microwaving certain types of recipes such as mashed potatoes, pudding or custard where rapid cooling could result in excessive boiling inside a sealed lid container due to trapped internal steam pressure; it’s best practice to vent 1-2 corners before serving!
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Alternatives to Using Pyrex in a Microwave

When heating food in a microwave, it is important to only use containers that are labeled safe for microwave use. While Pyrex containers are safe for use in the oven or on stovetops, they are not recommended for microwaving because of risk of thermal shock when exposed to high heat.

The best option is to look for containers that have a “microwave-safe” label on them. Other materials that are considered safe and can be used in microwaves include:

  • Plastic containers marked ‘microwave-safe’
  • Glass containers specifically designed for microwaving
  • Ceramic dishes without any colored glazes or metallics
  • Waxed paper, parchment paper, and cooking bags labeled ‘microwave safe’
  • Bamboo steamers with an open bottom, so steam can escape

If you need to reheat food quickly and don’t have any of these materials available, it is a better idea to transfer the food into a bowl or plate covered with a few layers of wax paper or parchment paper before microwaving it. This will prevent splatters from occurring and minimize risks of glass breakage or sticking issues.


Ultimately, it is best to use caution when microwaving any type of glass. When in doubt, refer to the instructions that came with your Pyrex glassware. Generally speaking, Pyrex bakeware can safely be used in a microwave oven as long as you follow usage instructions and don’t exceed recommended cooking times. If unsure of your specific dish, remember that it’s better to be safe than sorry.

Frequently Asked Questions

Q: Is it safe to microwave Pyrex?

A: Yes, it is safe to microwave Pyrex. Pyrex glassware is made from borosilicate glass, which is a type of glass that is non-porous and can tolerate high temperatures without breaking. It is suitable for use in a microwave.

Q: Is Pyrex glassware microwave safe?

A: Yes, Pyrex glassware is microwave safe. Pyrex glassware is made of borosilicate glass, which is a type of glass that is non-porous and can tolerate high temperatures without breaking.

Q: Can you put Pyrex dishes in the oven?

A: Yes, you can put Pyrex dishes in the oven. Pyrex glassware is made from borosilicate glass, which is a type of glass that is non-porous and can tolerate high temperatures without breaking. Be sure to follow the instructions for temperature, cook time, and other instructions that come with the dish.

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