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Is Pyrex microwave safe? What Precautions Must Be Taken

Pyrex is a well-known brand that has an unrivaled track record of producing high-quality kitchenware. Pyrex products, in general, stand for hard-heated resistant glass, but is Pyrex microwave safe?

To get the best answer to this question, you must carefully consider all factors. Let’s look at whether Pyrex can be microwaved safely and what precautions must be taken when doing so.

What is the composition of Pyrex?

What is the composition of Pyrex
What is the composition of Pyrex

Pyrex is a type of borosilicate glass manufactured by Corning Glass.

It is produced by repeatedly heating raw materials such as boric oxide and silica to high temperatures. The molten compound is then used to make various types of glassware.

Fluxes, formers, and stabilizers are common materials used in the manufacture of Pyrex products.

Formers are the key components in the manufacturing process, and they include crystalline materials that, when exposed to high temperatures, can easily melt and cool to form glass.

Flux materials are elements that help to reduce the temperature required to reach the ideal melting point.

Stabilizer materials are used to keep the glass from shattering, crumpling, or falling apart.

Because fluxes normally destabilize glass elements, these three materials are required. When used in tandem, the result is a brand-name line of products that have been around for decades.

***Read More: Can you Microwave Milk? How To Do It Safely

Is Pyrex safe to microwave?

Is Pyrex safe to microwave
Is Pyrex safe to microwave

Pyrex dishes are microwave-safe, according to the manufacturer. However, the company advises against shocking the glass by immersing it in water or placing it on cold surfaces immediately after heating.

When exposed to rapid temperature changes, all glass products experience thermal shock. Thermal shock is a process in which different parts of a material expand at different rates, causing cracks or shattering within the hardened material.

When a Pyrex glass dish is subjected to rapid temperature changes, it is unable to withstand the stress caused by uneven expansion. This situation could result in breakage or burst.

You don’t have to worry about shattering or breaking a Pyrex glass in the microwave.

When you switch a Pyrex glass dish from one appliance to another, the resistance level changes. Taking cold Pyrex from the freezer or fridge and immediately placing it in the microwave, for example, may result in a small explosion.

However, the company takes pride in its quality and has long-lasting, well-made products that can withstand the test of time. When using Pyrex products and following the manufacturer’s recommended guidelines, there is no risk of explosion or breakage.

It is always best to gradually preheat Pyrex dishes, jugs, cups, or bowls before exposing them to extreme temperature changes. The laws of thermodynamics state that temperature should not be changed abruptly or you will risk rapid expansion or contraction.

If you follow these general guidelines, you can microwave Pyrex safely:

Pouring hot liquids into a cold Pyrex measuring cup is not a good idea.

Never put a hot Pyrex dish on an extremely cold surface.

Microwaving an empty Pyrex cup may cause it to crack or shatter.

When it comes to selecting a safe dish, you should look at the packaging as well as the manufacturer’s recommended guidelines. If it does not say microwave-safe on the package, you should not buy it for that purpose.

So, what is the best microwave dish? It is a highly subjective decision because people’s preferences and cooking methods differ.

Some people prefer to use a regular Pyrex glass bowl. They believe that a microwave-safe bowl with a handle is the most convenient.

The thermal shock resistance of Pyrex glass products is up to 428 Fahrenheit or 220 Celsius. These kitchen glassware products stand out from the crowd, supporting extreme temperatures ranging from -104 to 572 Fahrenheit (-40 C to 300 Celsius).

So, if you choose the right product for your needs and carefully follow the instructions, you can microwave Pyrex safely. The Pyrex lids are also microwave-safe, ensuring a safe and enjoyable cooking experience.

***Refer to more: Home Tip: Can I Put Glass In An Air Fryer? Is It Break?

Can Pyrex be melted in the microwave?

Under normal circumstances, you don’t have to worry about Pyrex melting in the microwave. Pyrex manufactures kitchenware made of borosilicate glass that can be used in the microwave, oven, and even on the stovetop. This type of glass, composed of silicon and boron atoms, has an admirable toughness and practicality.

Type 7740 Pyrex has a melting point of 1,510°F or 820°C. The Pyrex glass does not melt if the heating temperature does not exceed this limit.

Home kitchen appliances, including the microwave, are incapable of reaching that temperature. So, there’s no need to be concerned about Pyrex melting in the microwave.

How long can Pyrex be microwaved?

How long can Pyrex be microwaved
How long can Pyrex be microwaved

In general, glass and ceramic are the best materials to use in a microwave. These materials outlast and outperform plastic and other disposable options.

When using Pyrex glass, there are clear instructions on the package. Pyrex glassware products are available in a variety of sizes and shapes to meet the varying needs of various cooking styles.

Pyrex cookware has been tested for up to 1000 hours before being released to the public. You should not be concerned about how long you can microwave Pyrex because testing far exceeds normal usage; however, following the manufacturer’s guidelines is necessary to avoid any unexpected turn of events.

***Read More: Do Air Fryers Use A Lot Of Electricity? Secrets Of Awesome Air Fryers

Microwave Pyrex Tips

Pyrex is a borosilicate glass manufacturer brand, so it still adheres to basic thermodynamics of expansion and contraction based on temperature fluctuations. If you follow the manufacturer’s instructions for safe use, you should have no problems.

Here are some microwave safety tips for Pyrex:

Thaw frozen foods before putting them in the microwave. Pyrex has introduced some jugs and bowls that can be transferred directly from your refrigerator to a microwave oven. Allow frozen foods to thaw in the container whenever possible before placing them in a high-heat microwave.

Follow the manufacturer’s instructions to the letter. When using a Pyrex glass measuring cup, container, or cookware, you must adhere to the manufacturer’s instructions. The manufacturer provides clear guidelines to optimize the vessel’s safety and longevity.

Wipe away the condensation or begin on a low power setting. Before microwaving, wipe off any condensation on the Pyrex. If you find it inconvenient, difficult, or the glass is simply too cold, you can gradually heat it on low power for a few minutes to allow the dish to thaw steadily.


  1. What caused my Pyrex dish to blow up in the microwave?

When a Pyrex bowl is rapidly heated or cooled, different parts of the bowl expand or contract differently, causing stress. If the stress is too great, the structure of the bowl will fail, resulting in a spectacular shattering effect.

  1. Is Pyrex glassware brittle?

Shattering is uncommon, but it can occur when glassware is subjected to abrupt temperature changes, also known as thermal shock, extremely high heat (above 425 degrees), or direct heat.

  1. Is it possible to cook frozen food in Pyrex?

The short answer is yes—but there are some ground rules to follow. Avoid extreme temperature changes when using Pyrex or any glass bakeware or cookware—very cold dishes should not be placed in a hot oven, and vice versa. Sudden temperature changes may cause the dishes to shatter or break.

  1. Is it possible to bake a cake in Pyrex?
Is it possible to bake a cake in Pyrex
Is it possible to bake a cake in Pyrex

You can bake a perfectly good cake in a Pyrex bowl, and for some specialty cakes, using the bowl to achieve a dome shape can save a lot of time and effort. Remember to oil the baking dish before you begin, to allow extra time, and to avoid “shocking” the glass with sudden temperature changes.

  1. How long does it take to bake a cake in a Pyrex bowl?

Bake for 45 to 50 minutes, or until the sides of the cake begin to pull away from the sides of the bowl and a knife or toothpick inserted into the center comes out clean. Cool the cake in the bowl for about 20 minutes before turning it out onto a wire rack to cool completely.


In a nutshell, the answer to the question “Is Pyrex microwave safe?” is yes. Pyrex can be microwave safe if you use the right product and follow the manufacturer’s heating instructions. You must purchase a vessel based on your specific needs and preferences; however, all Pyrex products are manufactured to the same high-quality standards and microwave-safe assurance.

Glass is one of the best microwave safe containers for use in an electromagnetic kitchen appliance to heat food. Rest assured and follow the simple instructions provided by the brand’s manufacturer.

If the safety recommendations are not printed on the product, they are easily accessible online. So, to summarize, you can microwave a Pyrex bowl with great assurance and confidence.

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