Pyrex is oven-safe up to 425 degrees. However, direct contact with heating elements can cause the glass to shatter or break. Pyrex is not oven-safe when used under the broiler or in a toaster oven.
This being said, you do need to follow one major rule when using Pyrex: Avoid extreme temperature changes. Shifts from one extreme to the other can cause thermal shock to the dish which can cause it to crack or shatter entirely.
Overheating: If a Pyrex dish is subjected to temperatures beyond its recommended limits (typically around 425°F or 220°C), it can weaken and shatter. Impact Damage: If the dish has been previously chipped or cracked, it may be more susceptible to breaking when heated.
Is Pyrex glassware susceptible to shattering? Shattering is relatively rare, but it can happen when glassware is exposed to sudden temperature changes (known as thermal shock), extremely high heat (over 425 degrees), or direct heat.
The next time you go to cook dinner in a Pyrex pan, take a look at the labeling. Cookware with lowercase logos are usually made of soda-lime glass and should not be heated up in the oven or microwave to minimize risk of them breaking.
To know whether or not your glass cookware is oven safe, look on the bottom of the dish for a Pyrex symbol or other notation that the glass is safe to put into the oven. If you cannot find a definitive marking, consult the manufacturer.
It's tempered, meaning it's been heated and cooled in a manner that makes it more durable under future temperature fluctuations. It's less likely to break under an impact, and when it does, tempered glass breaks into diamond-like cubes instead of long, pointy shards, so it's a little safer to deal with.
It is a tempered borosilicate glass, of superior quality and high resistance to thermal and mechanical shock. It is perfectly suited to extreme temperatures, from -40° to 300°, and has great resistance to thermal shock of up to 220°. All Pyrex® glass products are safe to use in the oven, freezer and vice versa.
The differences between Pyrex-branded glass products has also led to controversy regarding safety issues—in 2008, the U.S. Consumer Product Safety Commission reported it had received 66 complaints by users reporting that their Pyrex glassware had shattered over the prior ten years yet concluded that Pyrex glass ...
During testing, soda lime glass shattered at lower temperatures than “more expensive” borosilicate Pyrex® bakeware, the report continued. It turns out that the iconic glass bakeware produced in America today is of soda lime, while the European-made products Consumer Reports tested were borosilicate.
Yes, Pyrex can go in the oven.
Glass breaks under drastic temperature changes
Similar to stainless steel cookware, heat can impact glass dishes as well. Unlike their steely counterparts, glass cookware is less durable when exposed to massive temperature changes; it can easily crack, shatter, and pop.
chipping, cracking or severe scratching. DO NOT use or repair any glassware that is chipped, cracked or severely scratched. DO NOT drop or hit glassware against a hard object or strike utensils against it.
Because borosilicate is the most durable when it comes to withstanding temperature changes, it is generally considered the safest choice for glass bakeware.
Baking glassware such as Pyrex dishes in usable condition should be donated to local thrift stores or otherwise reused. If unusable they should be thrown away in the trash. They should not be added to curbside recycling. They are made of a different material than glass bottles and jars.
The intense temperature of an oven will cause the ordinary glass to crack. Different parts of a piece of bakeware can expand or contract at varying rates and cause kitchen and bakeware to lose its core structure and result in the dish shattering.
According to the FTC, during the pandemic, Pyrex measuring cups sold on Amazon.com were advertised as made in the United States. In reality, some glass measuring cups were imported from China.
Pyrex used to be made of the more heat-resistant borosilicate glass, which is more resistant to breakage when subjected to extreme shifts in temperature. Pyrex eventually switched to tempered glass most likely because boron is toxic and expensive to dispose of.
Can I Line Any Baking Pan with Foil? Yes!
I contacted Pyrex to ask if there's an easy way to tell what material your Pyrex dish is made from, and the company had a simple answer: Look at the logo. If it's all caps “PYREX,” it's vintage, made of borosilicate. If it's lower case “pyrex,” it's new, and it's soda lime.
Not all casserole dishes are created equal. Pyrex is made of glass, which can experience thermal shock when it's exposed to sudden temperature swings. And that thermal shock can make the glass expand and contract, making the dish shatter or explode if the change in temperature is extreme enough.
While Pyrex ovenware is a type of glass, it has been specially treated in the manufacturing process to withstand high temperatures, which makes it non-recyclable. Broken or chipped Pyrex should be disposed of carefully in the waste bin.
When using Pyrex or any glass bakeware or cookware, you should avoid extreme temperature changes—very cold dishes shouldn't be placed in a hot oven, and vice versa. Sudden changes in temperature may cause the dishes to shatter or break.