With the continuous improvement of people's living conditions, the requirements for living acoustic environment are also increasing. In the process of controlling traffic noise pollution, hollow glass windows are vigorously promoted by manufacturers. The hollow glass center is composed of two layers of single glass, with a 9mm air layer in the center. Due to the special structure of this kind of glass, most consumers will think that insulating glass is sound insulation, but it is not. This starts with the characteristics of the noise source.

At present, most of the noise sources for street residents are traffic noise. The traffic noise sources include three categories: first, the sound of car tires colliding with the ground. The sound is basically low and accompanied by oscillation. This situation is particularly severe near the concrete road than the asphalt road. Second, the sound of car engine, exhaust pipe and car transmission system. The higher the horsepower and the longer the vehicle limit, the stronger the noise in this regard. Third, the sound of vehicle oscillation caused by the collision of car horn, wind resistance, brake, deceleration belt and load. The instrument test shows that the sound pressure level of traffic noise should be above the medium and low frequency (below 200Hz), which is also the disadvantage of general insulating glass soundproof windows.

The structure of insulating glass is easy to form low-frequency resonance with traffic noise, and the amount of sound insulation in low-frequency band is not ideal. According to our test, the low-frequency sound insulation is large, only 19dB, and the overall sound insulation is less than 30dB. If the outdoor noise is more than 75db, the indoor sound environment can be imagined to be very annoying. Therefore, the sound insulation glass structure should be selected.

Article source: monolithic fireproof glass http://www.wan-xin.net/