PVB laminated glass, which is the glass we currently use. Laminated glass has the advantages of sound insulation, heat insulation, explosion-proof, radiation protection, we use the dry clamping process, the glass and PVB into the high temperature furnace inside the high temperature and high pressure to dissolve and press into a piece of glass. This is the standard for crooked people. But the clever Chinese invented two layers of glass filled with glue, the use of DEV film, or other films to replace the PVB, this material-saving and time-saving practices, so that the glass sound insulation effect is not enough, and after a few years the glass seems to be like a yellowed old photo. At present, to deal with low and medium frequency noise, we all use laminated glass to solve the problem, can do indoor 30-40 decibels, low and medium frequency noise refers to the car tire noise, car engine noise, ship buzzing, people talk to the voice ...... The PVB film of PVB laminated glass can effectively filter low and medium frequency noise, and the effect is very obvious. High-frequency, you guessed it, is the dog barking, school radio, square dance moms .... Noise, encounter this high-frequency noise will need to look at the number of floors, because the high frequency is a short wave penetration, so as long as the distance is enough, it can attenuate into low-frequency noise. If the distance is not enough, then strengthen the thickness of the glass, density and PVB thickness to solve the problem. (Airplanes, we all know that aircraft noise is very harsh, but why do we hear a buzzing sound? (Because this stuff is too far away from us, high frequency has been attenuated to low frequency, and generally only high floor can hear the airplane sound, low floor is not heard).