Can You Microwave Pyrex? (And Pyrex Lids?)

Pyrex is a famous brand that can be used to cook, bake, or reheat food in microwave ovens and preheated conventional ovens. Even more, you can toss Pyrex into the dishwasher or wash manually by hands using non-abrasive detergents. 

The Pyrex brand takes pride in the production of heat-resistant kitchenware. Unsurprisingly, it’s designed explicitly for ovenware. So does this mean that Pyrex is Microwave safe? Let’s find out. 

Is Pyrex Microwave Safe?

Pyrex glassware is safe for microwave ovens and conventional ovens. When compared to other brands, Pyrex is sturdy and thicker, making it durable. However, there are a few things that the manufacturer failed to reiterate on the official website. Such include the advantages and disadvantages of using Pyrex in the microwave. 

When you first purchase the Pyrex glassware, you’ll find some information on the packaging that says Pyrex is safe for use in the microwave, oven, and freezer. However, many users still raise complaints about cracks and explosions. 

Usually, Pyrex is safe when used on one device; however, it’s not resistant when used from one device to another. For example, Pyrex will explode when you put it directly into the microwave from the freezer. In most cases, you’ll blame the manufacturer for this while it’s a no-brainer that glasswares are prone to thermal shock.  

So what happens when you put hot Pyrex into the freezer? 

  • There will be a sudden temperature change
  • The glass is more likely to shatter
  • It will crack
  • You’ll be subjecting it to thermal shock 

So you see, Pyrex is Microwave safe when certain conditions are observed. 

Meanwhile, refrain from pouring hot liquids in cold Pyrex and vice versa. Also, avoid a drastic temperature change; instead, preheat Pyrex beforehand before tossing it into the microwave. This implies extreme temperatures anywhere from 100-120 degrees Celsius.

Can You Microwave Pyrex Lids?

Now that you know Pyrex glassware is microwave-safe (if you observe specific measures), it might also interest you to know about the lids. Are Pyrex lids safe for the microwave? Can Pyrex lids withstand high temperatures? 

While Pyrex glasswares are microwave and dishwasher-safe, the lids are heat-resistant too. They can safely go into the microwave, oven, and dishwasher, but when measures are observed. Most importantly, you should avoid exposing Pyrex to thermal shock. 

Additionally, you can use Pyrex lids for multiple functions. However, they are not applicable for use under the broiler or direct heat ( for example, stovetop burners). When used appropriately, Pyrex lids might work just fine for an extended period – whether on a microwave or stovetop.  

What Temperatures are Considered Safe For Pyrex? 

Pyrex Temperature Capacity, however, this glassware can still accommodate extreme cold temperatures of up to -313 degrees Fahrenheit. And because it exhibits sturdy construction, Pyrex dishes can safely go into the oven, refrigerator, or freezer. 

The standard temperature of Pyrex bakeware is 450 degrees. However, when increased beyond that, they are more likely to shatter. Even though Pyrex includes a label that indicates bakeware is safe for the oven and freezer, it would be best to avoid extreme temperature changes over time.

Can Pyrex Go From Freezer to Microwave?

No. Like any glassware, Pyrex is prone to thermal shock. If the glass has been in the freezer, it’s recommended to leave it at room temperature beforehand. If not, the glass will either crack or explode, depending on the cold intensity when transferred into the microwave. Meanwhile, you can microwave a glass that was recently put in the fridge. 

Thermal shock is often a result of stress produced in a body or material after a sudden temperature change. And that’s precisely what happens when you expose Pyrex glass to sudden temperature change.  

When you rapidly heat or cool a Pyrex glass, different glass parts expand or contract differently, thus stress. Sadly, the glass will shatter or even explode if the pressure is too extreme for the structure. 

Fortunately, you can prevent the stress effect by observing how fast you adjust the temperatures of Pyrex. You may also want to avoid using Pyrex on stovetops and broilers, as they are good heat conductors. Transferring a glass directly from the freezer into a hot oven might also influence the breakage.  

Recently, the Pyrex brand changed its manufacturer, which means that Pyrex is no longer made of the same material. However, its official website does not mention that. They still claim the Pyrex glassware can safely go from a freezer to a microwave, or convection, or a preheated conventional oven. 

And because it’s no longer made of the same thermal shock-resistant material, it would be best to handle it with extra care. Avoid placing on a stovetop. Also, do not expose it to sudden temperature changes, regardless of what the manufacturers say. In short, one should handle Pyrex glassware just like any other glass.  

Are All Pyrex Dishes Microwave Safe?

Yes, Pyrex dishes are safe for the microwave. Originally, Pyrex dishes were made of borosilicate glass – a material resistant to thermal shock. It’s currently made of soda-lime glass, presumably a budget-cutting measure, as soda-lime tends to be cheap. And because the current manufacturer is different, Pyrex is more of a brand name than a material.   

Unsurprisingly, Pyrex mentions no change in materials on its official website, let alone the type of materials they use in their products. Further, they claim that pyrex glassware is oven safe, microwave safe, and freezer safe. 

Pyrex no longer features thermal shock resistant glass, and as such, you should be extra careful when handling it. Avoid exposing it to sudden temperature change and placing it on a stovetop. In its current modification, Pyrex should be treated just like any other glass.  

Again, refrain from pouring cold liquids into hot glassware and vice versa. Do not use a wet piece of cloth when handling hot glassware; instead, use oven mitts. Place hot glassware on a cooling rack or a dry cloth and let cool. Before you can refrigerate or freeze glassware, ensure that it has cooled adequately to prevent thermal shock, or even worse, breakage.   

Meanwhile, preheat your oven before placing glassware. Also, avoid using glassware under a flame or broiler as it may crack. If you want to cook foods that may release steam, consider adding a small amount of liquid to the dish’s bottom. 

Above all, you should avoid microwave misuse such as microwaving popcorns, heating nearly empty glassware, and overheating. In case of breakage, handle the broken pieces with extra care to prevent injuries. Failure to manage your glassware with proper care will mean breakage, cracking, chipping, or scratching. It’s also worth noting that damaged glassware isn’t repairable. Banging against a hard object could also lower the life expectancy of your glassware.

Which Pyrex Dish is the Best for Microwaving?

A Pyrex glass jug. Preferences will often vary depending on the user’s taste and method of cooking. Some people perceive bowls to be better than dishes and cups. Even so, a typical Pyrex jug glass is the most preferred for microwaving. It features a handle for easy accessibility when the food is ready. 

Additionally, a Pyrex glass jug is a good bet if your recipe requires microwave interruptions such as adding ingredients or even stirring in the middle of cooking. You can easily take it out and do as per your recipe instructions. 

While there are no restrictions to using a specific type of glassware, there are many glasswares you can try for different recipes. However, the Pyrex glass jar still stands out from many other types.

As for any microwave mug recipes, the Pyrex jug can work perfectly well. With this Pyrex jug, you can try nearly all microwave recipes. Meanwhile, Pyrex glassware is available in different size and shapes:

  • 0.25-liter jugs are ideal for cupcakes or cheesecakes
  • 0.5-liter dishes are excellent for soups and porridges
  • 1-liter bowls are super convenient to microwave yogurt, broths, or vegetables

How Do You Stop Pyrex From Exploding?

As with any other glassware, a certain degree of care must be observed, especially when handling foods that require high temperatures. Three primary risks come along with glassware when used for cooking. 

First, your glassware is more likely to break when exposed to a sudden change in temperatures. Second, your glassware will break if banged or knocked against a hard object. Finally, you might get burnt when handling hot bakeware. 

Additionally, Pyrex will expand or contract differently when heated or cooled rapidly. Not only that, but the glass might also fail due to the stress effect that is a result of shattering. 

Meanwhile, follow the warnings below to prevent personal injuries or glassware damage caused by thermal shock or extreme stress. 

  • Don’t place a hot glass dish directly on your stovetop: Although stovetops are heat resistant, putting hot glassware on a cold surface will result in shattering. Instead, place a hot glass dish on a potholder, cooling rack, a dry cloth, or a hot cloth pad to avoid thermal shock. 
  • Don’t cook a dry dish in a glass pan: Always avoid cooking dry foods on glassware. Alternatively, add a little amount of water to protect the bottom of the glass. Often, this applies to cooking foods that release steam. The point is to avoid thermal shock due to rapid temperature changes. Adding some liquid beforehand will prevent room or cold temperature liquids from posing a negative impact. 
  • Ensure all clothes or oven mitts are dry before using them to handle hot glassware: While this sounds ironic, wet clothes are good heat conductors. They quickly get hot, burning your hands. 
  • Use oven mitts to handle hot pans: When handling any hot cookware, always put on oven mitts. Unfortunately, this is one of the few peculiarities Pyrex fails to mention in its official website of handling instructions. 
  • Don’t use glass cookware to reheat dry foods in the microwave: Again, consider a little amount of water to cover the bottom before you can start cooking. Essentially, this prevents sudden temperature changes that could lead to breakage. 
  • Don’t use glass cookware for cooking dishes that require high heating: This involves cooking on direct flames such as stove tops, broilers, grills, and toaster oven. Unless the glassware is intended for that specific purpose, please do not use it under high heat. 
  • Consider cooling time factor: This is especially true when you plan to scoop your dinner using a metal spoon. Be patient enough to allow the glass to cool a few minutes before scooping it up with the room temperature metal spoon.

Frequently Asked Questions

1. Can you put a glass Pyrex dish on the hob?

Pyrex can handle the heat. However, it needs to be brought up slowly. Putting cold glass on a hot plate surface will cause it to shatter, whether or not it is the durable Pyrex or another type of glassware intended for the oven or stovetop. There are two lines of Pyrex cookware that are good for cooking on a hot plate.

2. How can you tell if Pyrex is oven-safe?

Check on the bottom. The ones that are oven safe will say they are. Pyrex used to be low expansion borosilicate glass, but the name was sold a few years ago (1998) and now in the USA Pyrex is just tempered glass.