Acoustical glass can be divided into insulating glass, vacuum glass and Laminated glass according to different manufacturing processes.
　　Insulating Glass 

Insulation glass is composed of two layers of glass, surrounded by high-strength and high airtightness composite adhesive to bond and seal the glass with sealing strips and glass strips. A 6-9mm air layer is filled in the middle with dry gas, and the frame is filled with desiccant to ensure the dryness of the air between the glass sheets. Its characteristic is that it has a relatively good insulation effect due to leaving a certain amount of cavity, so it is widely used in northern cities.In terms of sound insulation performance, high-frequency noise in insulating glass (such as the sound of people speaking, the sound of high pitched horns in schools, etc.) has good sound insulation effect, but the effect on low-frequency traffic noise (such as bus engine noise, train noise, aircraft noise, etc.) is not significant, because the air cavity of insulating glass will resonate with the low-frequency noise from the outside in the low-frequency zone, and low-frequency noise is easier to enter the room through the glass.The production of insulating glass can be divided into two types: machine assembly line processing and manual processing. The assembly line processing is aimed at large areas (ranging from thousands of square meters to tens of thousands of square meters), and manual processing is generally aimed at household users. Compared to the two processing methods, the quality of products produced by machine assembly lines is relatively stable, while the quality of handmade products varies depending on the level of attention each manufacturer places on quality and craftsmanship. Poor quality insulating glass may become foggy and cannot be cleaned after six months or more.
　　Vacuum glass

Many customers consider insulating glass to be vacuum glass, but there is actually a certain difference between the two. Vacuum glass is generally composed of two layers of 4mm thick flat glass, with a 1.5mm thick space left between the two layers for vacuum pumping (there are also other thicknesses). Because negative pressure is formed between the two glass sheets during the vacuum pumping process, which will cause them to suck together and lose the vacuum layer, it is necessary to pad a certain density of flexible support points or strip support frames between the two glass sheets when producing vacuum glass.
　　Due to the fact that the two layers of vacuum glass are almost evacuated, it has the characteristic of high thermal resistance and is a good insulation product. This is also the original intention of designing vacuum glass, and the insulation performance it possesses is also difficult to compare with insulating glass.
　　In terms of sound insulation performance, vacuum glass is also better than hollow glass because the air inside the hollow glass is the same as the outside world, and vacuum glass is almost vacuum, and noise cannot be transmitted in a vacuum state. Therefore, hollow glass is also incomparable in sound insulation compared to vacuum glass. After vacuuming, the two pieces of glass almost stick together, So when producing vacuum glass, small supports should be placed between double or triple layers of glass. These supports have become sound bridges for sound transmission.But these supports only account for one thousandth of the area in a window, which can be almost ignored, and most vacuum parts can isolate dry sounds. Therefore, no matter what type of soundproof window it is, it is impossible to completely isolate all dry sounds. Therefore, when selecting soundproof windows, it is important to consider the quality of the vacuum glass, as vacuum glass can basically meet the soundproof function.
　Laminated glass

Laminated glass is a kind of production process of safety glass. It is also called laminated glass in foreign countries. It can be pressed together in two layers or in multiple layers. Some Laminated glass will blister after being exposed to the sun for a long time. This is because the wet clamping method is used. Therefore, the dry clamping method is generally used for Laminated glass applied to architectural glass, which can avoid blistering of the laminated glass.

Although the through Laminated glass also has good sound insulation effect, it still has some shortcomings, but it can achieve quite good sound insulation effect after adjusting the composition of the intermediate membrane and technical treatment, which is incomparable between insulating glass and vacuum glass. Of course, the sound insulation effect of laminated soundproof glass varies depending on the technical content of different manufacturers.

It can be sandwiched between a PVB intermediate membrane with Polyvinyl butyral as the main component (such glass is commonly known as "PVB glass"), or a KK Hyperelastic material intermediate membrane with high polymer as the main component (commonly known as "KK Hyperelastic material glass"). In terms of sound insulation, KK Hyperelastic material glass has significantly higher sound insulation than ordinary PVB glass, because the PVB intermediate film is hard, not as soft and elastic as the polymer film.If the intermediate film in Laminated glass is very soft and elastic, the damping coefficient of its laminated glass can be increased, thus improving the sound insulation of Laminated glass. The sound insulation of ordinary PVB glass is only 28-34 decibels, and the sound insulation of KK Hyperelastic material glass can reach 35-40 decibels or more.