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For example, a calculation published by the American Ceramic Society found that borosilicate glass can withstand a sudden temperature change of up to about 330 degrees Fahrenheit, whereas tempered glass can withstand a temperature change of about 100 degrees. R.C. But if you’re especially nervous about the risk of unexpected breakage from thermal shock, you have other options. The publication references the tests performed by Consumer Reports, which used dry sand heated in casserole dishes. If you have a blowout incident while cooking, make sure to inspect your oven and kitchen thoroughly as glass shards can travel pretty far across the kitchen. It’s also more susceptible to breaking from thermal shock (sudden or extreme changes in temperature, such as what happens when you pour a hot liquid into a cold glass). William C. LaCourse, PhD, professor in the Glass Engineering department at Alfred University, email and phone interviews, December 1, 2016, and July 2, 2020, 7. But when you consider the thousands of pieces made each day in a glass factory, the number of incidents reported is remarkably small. This damage can weaken the glass without fully breaking it. Some publications (such as ConsumerAffairs) have cited this weakening as one possible reason for spontaneous fracture.

Always let them cool (preferably on a dry towel, not a cold counter) completely first. What does it look like when it breaks? But if you stay within the recommended temperature threshold indicated in the manufacturer’s instructions and treat your glassware with the proper care to limit nicks and scratches, we think the risk of spontaneous breakage is low. Glass pie plates allow you to see when your crust is sufficiently browned. Will it break if heated or cooled? Family safety warning: Glass bakeware that shatters, Consumer Reports, December 22, 2010, 10. It’s literally ripping itself apart. “The glass may not break immediately, but … it can fail at a much later and essentially unpredictable time. Other uses for Pyrex that were once common, like using them on the stovetop, are no longer recommended since the formulation for borosilicate Pyrex glassware is different than when the company first started creating Pyrex Flameware for stovetop use. According to Pyrex’s safety and usage instructions, “While the glass is designed for temperatures typically used in baking, it can break when exposed to the direct heat element while the … While Pyrex cookware is better at going from extremes than plain glass, it is still not recommended. “I assume they’ve done a lot of work to make sure that the cooling rates of the different parts of the pan cool about equally, but it’s pretty difficult to do that.” Aside from improper tempering, various flaws can weaken the structure of the glass and make it more prone to breakage. Martens, Shattering Glass Cookware, American Ceramic Society Bulletin, September 12, 2012, by Ray Aguilera, Ganda Suthivarakom, and Sarah Zorn. Oftentimes the reviewer isn’t even aware that they’ve used the bakeware inappropriately. Advice, staff picks, mythbusting, and more. Let us help you. This phenomenon usually occurs when something cold is heated up too quickly. Please support this website by adding us to the whitelist in your ad blocker. How much will a midwifery schooling cost? (If you want to get really nerdy, scientists in fracture mechanics call this kind of damage subcritical crack growth.) It’s a difference in temperature from one part of the glass to another part of the glass. It’s true that tempered glass is more susceptible to thermal shock than borosilicate, but experts disagree on how much more susceptible it is—and we think some calculations may exaggerate the risk. They’re more likely to stick when they’re hot, and you can cause superficial damage to them when you pull them apart. Unlike the old days when Pyrex was first becoming the American standard for kitchen ware, most people today understand that the material has a lot of limitations which were previously absent or went ignored. Just keep in mind that even borosilicate glass can break from thermal shock, albeit into fewer, larger pieces. What is the max oven temperature for Pyrex. And for each, you have three things to consider: Will it break easily if dropped?

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