The reason mugs crack is due to thermal expansion and cold contraction. As soon as hot water is poured into the cup, the temperature inside the cup expands rapidly, but the temperature outside the cup is the original temperature, so the temperature inside the cup expands and squeezes the outer wall vigorously, and the cup may burst.
There are three common materials on the market: soda-lime glass, tempered glass, and high borosilicate glass, among which soda-lime glass is the most commonly used.
At the same time, put the cups of the three materials into the refrigerator for 10 minutes to let the temperature of the cups cool down. After ten minutes, open the refrigerator and take out the glass at the same time, and pour hot water at the same time.
Among these glasses, the soda-lime glass burst instantly, and the tempered glass cracked. Only the high borosilicate glass was intact, because the cups made of different materials have different abilities to withstand the temperature difference between cold and hot.
High borosilicate glass is not easy to burst, because in the production process, elements such as boron and silicon are added, plus water glass sand, soda and ground lime, and after firing at a high temperature of more than 1,000 degrees, the high borosilicate glass is made Can withstand large temperature differences.
Glass is a common water cup in daily life. We must pay attention to its material and use it according to the material. If you buy a soda-lime glass, remember not to use it to hold hot water. If you buy a tempered glass, Before using it to hold hot water, you must remember to use warm water to increase the temperature of the cup body, reduce the temperature difference, and then pour hot water.