The acoustic glass is a glass composed on the outside by a laminated glass of two sheets joined together by a layer of plastic (PVB) designed to reinforce the acoustic insulation, an air chamber, and a second inner glass, which can be a simple glass (transparent or acid-tinted to preserve privacy) or a laminated glass with a function of thermal insulation, solar control, low emissivity or security.
The decibels (dB) measure the intensity of the noise. The listening level is set at 0 dB, below which the human ear does not perceive the sound. The threshold of physical pain to the ear is around 140 dB. A plane when taking off generates 130 dB. A quiet environment does not mean that the sound level is 0 dB. A comfortable stay should not exceed 40 dB during the day and 35 dB during the night. At 50 dB, concentration difficulties appear. In a quiet forest we will find 20 dB, in a 35 dB library, in a 60-70 dB office. The noise coming from a road with traffic is 75-80 dB. A simple crystal attenuates the noise 20 dB. This glass is not an effective barrier against noise pollution. A double glass can achieve an attenuation of 30-32 dB. The price-performance ratio of this double glazing is exceptional.