The double-layer glass is made of high borosilicate glass, which has high temperature resistance and corrosion resistance unmatched by traditional glass. It does not contain lead that is harmful to the human body, does not absorb odors, and has good health, safety and transparency. The thermal insulation function is well received by everyone. But have you ever noticed that every double glass has an air hole at the bottom, what is it for?
It turns out that double-layer glass cups are generally blown by hand, and there is an air outlet at the bottom of the outer layer of the cup to discharge gas during the blowing process to prevent the cup from deforming and bursting. This process is similar to the inner liner of a thermos bottle. The closing point, where the air between the glass during the production process can be excluded. It can balance the pressure between the glass when loading hot water and cold drinks, so that the air circulates to avoid the infiltration of water vapor, effectively prolonging the service life of the glass, and ensuring safe use. The main function is to promote the air circulation in the cup, Prevents cups from breaking due to pressure.
To sum up, the bottom of the double-layer glass is designed with air holes because the function of the small holes is that when the cup is filled with hot water and the air begins to expand, there will be a place to discharge the air, otherwise the cup will be damaged due to excessive pressure. burst and injure the user. That is to say, the air hole at the bottom of the double-layer glass is actually a protective device, which can ensure the safety of the glass to a large extent, so we try not to touch the air hole at the bottom of the double-layer glass at will when using the double-layer glass. Damage to pores is not easy to repair.
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