Thermal shock occurs when the object’s stress becomes too intense, causing the material to lose its shape. The bakeware that was made during this time was able to withstand a bit of hard usage.
In the late 1990s, Corning ware sold their Pyrex line to World Kitchen, who changed the manufacturing material from borosilicate to soda-lime, which does not have the same thermal resistance. As a rule of thumb, Pyrex cookware is made with heat-strengthened soda-lime that works well on the stove top.
The uneven heat from a burner causes thermal shock to the pot, resulting in shattered bakeware. You can use Pyrex bakeware in microwaves, preheated convection or conventional ovens.
If it is deeply scratched or chipped, do not use Pyrex as the dish is compromised and can break. The targeted heat that both builds will cause the same thermal shock as using on the stove top.
Use your favorite non-abrasive cleaners Use baking soda and dish soap for hard to remove spots. Pyrex and glass bakeware made with soda lime is only tolerant of even temperatures.
When it is subject to uneven temperatures, the glass expands and contracts in different places, which causes stress against itself, which causes the bowl to shatter with a loud sound that sounds like an explosion. Put on gloves and wear shoes Pick up the big pieces carefully Use a broom and dustpan to gather as much of the tiny shards as possible.
Use a damp paper towel folded to a thickness that the shards cannot cut through, carefully press it into the glass. The glass will stick to the paper towel, making clean up easier.
F you don’t have the instructions on hand for a particular glass dish, avoid using it on a stove top. Cast iron behaves the worst on a glass top stove.
Cast iron is slow to conduct heat and is rough so it can scratch the surface of the stove. Once cast iron is up to temperature, it holds the heat and transfers it back onto the stove, causing damage.
Stainless steel with a sandwich-clad bottom conducts heat well and does not scratch the stove top. Stainless steel does not leave a residue as a copper or aluminum bottom would.
Pyrex glass bakeware can be used in used for cooking, baking, reheating food in preheated ovens. There seems to be conflicting views on whether a Pyrex dish can be used on a gas burner.
European Pyrex is made from borosilicate glass, the same as in laboratory's equipment; American Pyrex is made from common soda-lime glass. If you are in America, don't bother trying it at all; soda-lime glass is sensitive to thermal shock.
In Europe, you could take your chances if you have a bowl you don't mind risking. However, there is still a significant chance that it will break on the burner some day.
Some pieces actually say “Not for stove top ”, but we never put vintage Pyrex bowls, casseroles or whatever directly on the stove, ever. But we do get a lot of people who are asking about Flame ware and related Coffee makers / pots.
Flame ware was indeed meant to go directly on the stove, and that includes the coffee makers. Tried it today melting some butter on a low heat and it exploded violently sending glass shards in a 1-metre radius.
I used the dish on top of a second steel pot containing water to warm the egg on the gas stove. Then transferred from that hot location to a bath of cold water to try to quickly cool and set the marzipan.
After a few seconds in the cool water I heard a crack sound. The reputation requirement helps protect this question from spam and non-answer activity.
Breakage due to impact if the glass -ceramic product is dropped or knocked against a hard object. WARNINGS The enclosed CORNINGWARE® products are made from glass -ceramic and can be used in conventional, convection, toaster and microwave ovens, and on a range top, under a broiler, in the refrigerator, freezer and dishwasher.
FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN PERSONAL INJURY OR PROPERTY DAMAGE, OR MAY CAUSE YOUR PRODUCT TO BREAK IMMEDIATELY OR LATER. DO NOT place PYREX ® glass cover on or under a flame or other direct heat source, including a stove top, under a broiler, on a grill or in a toaster oven.
ALWAYS preheat convection or conventional oven when using PYREX glass cover on CORNINGWARE item. DO NOT place hot PYREX glass cover directly on a countertop or any metal surface, or in the sink.
Be sure to allow glass cover to cool as provided above before washing, refrigerating or freezing. DO NOT strike utensils against rim of cookware or glass covers to dislodge food.
DO NOT use glass -ceramic cookware to cook popcorn, caramelize sugar, make candy or deep fat fry. DO NOT use abrasive cleansers, scouring pads, or any object that will scratch the cookware or accessories.
All glass -ceramic CORNINGWARE® can be used in conventional, convection, toaster and microwave ovens, on a range top, under a broiler, in the refrigerator, freezer and in the dishwasher. Metal utensils can scratch or leave gray marks.
DO NOT place PYREX ® glass cover on or under a flame or other direct heat source, including a stove top, under a broiler, on a grill or in a toaster oven. If scouring is necessary, use only plastic or nylon cleaning pads, again with nonabrasive cleaners.
To prevent permanent stains and blisters, AVOID REHEATING foods high in oil, fat, sugar or tomatoes. Adding liquid to hot, dry glass cookware splits the glass and even a simple chip on the rim prevents a good seal, allowing the steam to escape.
Despite these drawbacks, glass utensils are relatively durable and retain heat for a longer duration. Many people like to watch the food cook in glass cookware, as there is no need to remove the lid to see what is happening.
Some of these utensils are built to handle stove tops; however sufficient care must be taken to prevent them coming in direct contact with electric components or intense heat by placing a metal trivet or diffuser beneath them. Additionally, glass vessels are totally incompetent when it comes to deep-frying, as the food necessitates constant stirring and longer cooking times.
Now a paper published in the September 2012 edition of the Bulletin of The American Ceramic Society for the first time offers a scientific reason why certain glass cookware is more susceptible than others to explosive shattering and the likelihood of exposing users to injury from airborne glass shards. Interestingly, the name Pyrex came from the accidental discovery that the composition, which was an attempt to improve the heat resistance of glass battery jars, could be used to cook food.
The story goes that one of the Corning lab scientists, Jesse Littleton, one day brought home the bottoms of a few of the borosilicate glass jars for his wife to use as pie tins. Corning currently licenses the use of the Pyrex brand name to World Kitchen LLC for sale in the United States, having sold its Pyrex cookware manufacturing to Borden KKR in 1997.
Consumer Reports and others documented that the explosion-like glassware failures seemed to be linked to rapid changes in temperature, such as when the cookware was removed from the oven and placed on a counter or dinner table. The publication also noted that virtually all the reports of glassware failure were related to vessels made of the soda lime silicate glass.
According to their calculation and those of others, soda lime glass cookware shatters more frequently for the reason that, in theory, it can only resist fracture stress for temperature differentials less than about 55 °C (99 °F). The two do state that all manufacturers of glass cookware caution consumers against placing hot vessels directly on a countertop or a moisture-containing surface as a precaution against rapid temperature changes that could trigger the exploding Pyrex effect.
Brad and Martens also looked into manufacturers’ claims that they use heat strengthening or thermal tempering processes to increase the soda lime silicate cookware ’s resistance to thermal stress fracture and, if breakage occurs, to promote the formation of small glass “dice” instead of sharp glass shards. However, based on their research, they finish with a warning that “the margin of safety for avoiding thermal stress failures of soda lime silicate cookware is borderline.