The difference in performance is significant. Insulated glass is theoretically not empty, with "gas" in between the two layers of glass. In most cases, "gas" is air, while the better quality is argon. Since the gas cannot be seen with the naked eye, so we said to be "empty".
Vacuum glass is the process of creating a vacuum between two layers of glass, which essentially means there is no gas left and it is truly empty.
Why can a thermos keep warm for a long time? It is because there is a vacuum layer between the inner and outer walls of the inner gallbladder, Effectively blocking the conduction of heat. Vacuum glass is the process of sealing two flat glass plates together, leaving a gap in the middle and sealing the exhaust hole. Two pieces of glass are coated with one or two layers of transparent low radiation film on the inner surface. The thermos bottle liner is composed of two layers of glass shells inside and outside, forming a cavity that is vacuumed and coated with silver inside. Vacuum glass is equivalent to making a thermos flat, and some people jokingly say that the theory of vacuum glass windows is to "make the thermos on the window".
In addition to good insulation performance, vacuum glass also has better sound insulation performance than insulated glass. Hollow glass has relatively poor insulation effect at a fixed thickness. Vacuum glass utilizes the thermal insulation performance of vacuum, and its thermal insulation effect is more than twice that of insulated glass.
Both insulated glass and vacuum glass have a certain sound insulation effect, but vacuum glass has a better sound insulation effect because there is no gas or substance conducting sound waves in the middle of vacuum glass.
The wind pressure resistance strength of vacuum glass is about twice that of insulated glass, but its impact resistance is not as strong as insulated glass. This weakness can be addressed by combining vacuum glass. For example, in the required location, laminated glass technology can be used to add tempered glass on one or both sides of the vacuum glass to form a safe vacuum glass with high impact strength and wind pressure resistance. Undoubtedly, this will also increase the cost accordingly.