In life, many people still dare not use glass when drinking water, because there is a shadow of sudden bursting at the bottom of the cup (when I was young, I used a canned bottle to fill hot water, especially in winter, it is very easy to step on thunder), so even if you know that glass is more healthy and environmentally friendly, I still don't dare to try it lightly, so today I will talk to you about why your water glass will drop to the bottom? Is the glass safe to use?
First, explain the reason for the bottom of the cup: cups that are easy to burst, such as canned bottles or cups with thick materials, the bottom of the cup is generally thicker than the body of the cup. Since the glass conducts heat slowly, the body of the cup will be faster after pouring boiling water. The thermal expansion of the cup bottom is slower, which generates shear stress, and the cracks neatly from the bottom of the cup . There are also some water cups that burst through the same principle. The uneven thickness of the cup causes a big difference in thermal expansion and contraction!
So when buying a glass, in the face of the most common soda-lime glass, tempered glass, and borosilicate glass on the market, which material to buy will avoid bottoming?
Simply put, soda-lime glass is ordinary glass, the cup and bottom are very thick , Its main composition is composed of silicon, sodium and calcium, with high chemical stability, but heat resistance Poor performance, it is not recommended to fill in boiling water. It can be used as a cold water cup or storage tank;
Tempered glass is a "tempering process" on the basis of ordinary glass to make the glass looks translucent, easy to wash, and strong to use, but it is the same as soda lime glass is not heat resistant , has the risk of "self-explosion" ;
high borosilicate glass is mainly composed of silicon rods and boron silicon (3.3 borosilicate) A low expansion rate (thermal expansion coefficient: (0~300℃)3.3±0.1x10-6K-1), high temperature resistance (softening point 820℃, high thermal stability High strength, high hardness, high light transmittance and high chemical stability special glass material, can be made very thin and translucent, the bottom of the cup One-piece molding, there is no risk of explosion, and the use in the household daily necessities industry is heat-resistant glass water cups, glass tea sets, etc.
* (from left to right are ordinary soda-lime glass, tempered glass, and borosilicate heat-resistant glass)
The above are the common types of glass on the market The difference between cups, I hope it will help you,If you want to learn more about glass, please leave a message below for interaction.
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