This shock causes different parts of the glass to expand at different rates and often crack from stress, making soda-lime glass a poor candidate for bakeware.Īn untempered soda-lime glass shattered after tumbling off a 3-foot-high counter onto a marble slab. 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). Untreated soda-lime glass is far more likely than the others to break from a tumble off your table. It’s the most common-used for everything from drinking glasses to pickle jars-because it’s versatile and inexpensive to produce. Let’s start with the basic soda-lime glass. And for each, you have three things to consider: Will it break easily if dropped? Will it break if heated or cooled? What does it look like when it breaks? Three basic types of glassware are typically found in most home kitchens: soda-lime, tempered, and borosilicate. When tempered glass-which is what most glass Pyrex bakeware is made of-breaks unexpectedly, it can be pretty shocking and potentially dangerous (not to mention frustrating when it ruins your Thanksgiving pie). These tales crop up regularly in Amazon reviews and news reports, such as this 2010 investigation by Consumer Reports. You may have heard dramatic stories about Pyrex bakeware “exploding” or shattering seemingly out of nowhere.
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