Are pyrex dishes flameproof?
Borosilicate glass has a thermal expansion coefficient about one-third that of ordinary glass. This reduces material stresses caused by temperature gradients, thus making it more resistant to breaking. Pyrex begins to soften around 821 °C (1510 °F); at this temperature, the viscosity of type 7740 Pyrex is 107.6 poise. [2] Pyrex is less dense than ordinary glass. When broken, Pyrex tends to crack into large pieces rather than shattering (it will snap rather than splinter). Safety issues Pyrex, while more resistant to thermal shock than other types of glass, should never be subject to drastic or uneven temperature changes, such as when taken from the oven and placed on the stove elements (an excellent heat conductor) to cool, or immersed in cold water when hot. This can crack or shatter the dish.[citation needed] However, recent reports suggest that due to the change in manufacturing,[1] notwithstanding the claims made for Pyrex, the glassware can shatter violently and unexpectedly, even
