In principle, the vacuum glass can be compared to a flat-shaped thermos bottle. The difference between the two is that the sandwich of two layers of glass is a vacuum with a pressure lower than 10-1 Pa, so that the gas heat transfer is negligible; both inner walls are plated with low Radiation film, so that radiation heat transfer as small as possible. The difference between the two is as follows: First, vacuum glass must be transparent or light-transmissive for doors and windows. It cannot be coated with opaque silver film like a thermos bottle . It is coated with different types of transparent low-radiation films; The cylindrical or ball-type thermos become flat plates, and a "support" matrix must be set up between the two layers of glass to withstand about 10 tons of atmospheric pressure per square meter, so that spaces between the glass are maintained to form a vacuum layer. The distance between the "support" matrix is designed according to the thickness of the glass plate and the mechanical parameters, between 20mm-40mm. In order to reduce the heat transfer formed by the support “heat bridge” and make it difficult for the human eye to distinguish, the diameter of the support is very small, the diameter of the support in the product is between 0.3mm-0.5mm, and the height is between 0.1mm-0.2mm . Vacuum glass also has a better function that is sound insulation. Because of the vacuum layer, it can not conduct noise, so vacuum glass can isolate 90% of the noise.