How to tell whether the glass is resistant to high temperature
Glass cup has high temperature resistance and high temperature resistance of two kinds of materials. The use temperature of the glass is generally "-5 to 70 degrees Celsius", if it is a high temperature glass made of borosilicate material, then its use temperature can be 400 to 500 degrees, and can withstand the temperature difference of "-30 to 160 degrees Celsius".
The surface of the hot water in the high temperature glass is not hot, and the surface of the hot water in the high temperature glass is hot.
Ordinary glass is a bad conductor of heat, when a part of the inner wall of the glass is suddenly hot (or cold), the inner layer of the cup is obviously expanded by heat, but the outer layer is not heated enough and expands less, which makes the temperature difference between the various parts of the glass very large.
The main characteristic of high borosilicate glass is that it has a very low coefficient of thermal expansion, about one-third of that of ordinary glass, that is, it is not sensitive to temperature, and there is no common thermal expansion and contraction of general objects, so it has high temperature resistance and high thermal stability. It can be used to hold hot water.
Do not use the tempered glass on the market as a high-temperature resistant cup, and the use temperature of the tempered glass is the same as that of the ordinary glass, generally below 70 degrees, and it needs to be used with caution.
If it is a heat-resistant glass, the cup will generally be affixed with the corresponding label, indicating the use of temperature, range of use; When you buy, if you find nominal heat-resistant glass but the price is very low, consider its authenticity
