Brittle materials like glass are much more vulnerable to thermal shock, because they break when their molecules quickly expand under heat or contract under cold.
If you put a hot glass pan on a wet or cold surface you are risking the glass shattering due to thermal shock aka a rapid change in temperature.
It's called thermal shock. When glass goes from hot to cold or cold to hot, the sudden temperature change can cause parts of it to contract or expand more rapidly than other parts. This can make it shatter.
Place the pan on top of an unheated metal baking sheet before sliding it into the oven. This helps prevent abrupt temperature spikes that could damage the glass. This little trick smooths out any sudden spikes in temperature, keeping your glassware safe from shattering.
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.
While a move from the fridge to a 350ºF oven likely won't cause any damage to your Pyrex dishes, I recommend erring on the side of caution. Avoid extreme temperature changes, and let your prepped enchiladas rest on the counter for 15 to 30 minutes before putting it in the oven.
The most common cause of these is the use of stainless-steel machinery in the glass making and handling process. Small shavings of stainless steel containing nickel change structure over time and grow, creating internal stresses in the glass. When these stresses exceed the strength of the glass, breakage results.
If your oven glass is broken or cracked we wouldn't recommend you using the oven. The inner oven glass is a thermal barrier. Without the inner panel, all the heat is going on the outer glass panel. As a result, this will become incredibly hot.
Thermal fracturing in glass occurs when a sufficient temperature differential is created within glass. As a warmed area expands or a cooled area contracts, stress forces develop, potentially leading to fracture.
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.
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.
Answer and Explanation:
When this hot plate is put in the cold water due to low temperature, the outer layer of the plate feels compression force, due to change in forces glass shatters.
Rules for Using Pyrex In the Oven
Uneven heating, direct contact with heating elements and sudden temperature changes can cause glass to shatter or break.
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.
Brittle materials like glass are much more vulnerable to thermal shock, because they break when their molecules quickly expand under heat or contract under cold.
Why Does Oven Door Glass Break? Rapid temperature changes, such as setting a hot dish on the cool surface of the oven door glass when the door is open or exposing the door glass to cold water, can cause thermal shock.
Thermal Shock - The Science Behind Exploding Glass
The scientific reason that the glass mixing bowl on the stove exploded and shattered is a term called "thermal shock," which is what happens when glass (or ceramic) gets a sudden and rapid temperature change and cracks, sometimes with explosive force.
Breaking glass is often seen as an omen of good luck.
It's true that some say broken mirrors are bad luck, but not all broken glass is a bad omen. Broken glass is often a sign of release or freedom, and likewise often signifies good things coming your way.
Extreme temperature differences over small areas can cause damage, which could in turn lead to shattering. Not sitting or standing on the glass surface. Not striking the glass with hard or pointed items, or use the glass as a chopping surface. Not dragging rough or heavy objects over the top of the glass.
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. Pyrex Vs. Anchor Hocking: Are They Different?
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.
Ultimately, vintage Pyrex, made from borosilicate glass, is generally considered safe to use in the oven. Its robust composition makes it highly resistant to temperature changes and less prone to shattering, even when subjected to the high temperatures of an oven.