Large factories usually more than 120 db, and mainly concentrated in the high frequency, the penetration, the spread of distance, usually low-frequency sound insulation material is also very limited, ordinary plasterboard wood panels damping effect of low-frequency sounds only a few dB, it is difficult to form an effective barrier. I use high-tech means to solve the problem of low-frequency noise conduction, to undertake professional sound engineering plant, plant noise reduction project. Large plant noise reduction project in general needs to be done elastic sound insulation, the machine's noise reduction, ground and noise damping floating building walls. Often used in high-density glass wool, high-efficiency white insulation blankets, insulation plates and other materials, floor insulation for the poor also need to increase the quality of steel and other heavy soundproofing material. I am in Sichuan, Guizhou, Anhui, Jilin, Gansu, Shaanxi, to undertake the plant soundproofing project, and achieved satisfactory results. Fiberglass sound-absorbing cotton sound-absorbing material is currently known, the sound absorption performance of the best materials in the construction of high acoustic performance anechoic chamber project, wool is almost the only optional filler. Fiberglass sound absorbing cotton may also be referred to as acoustic cotton, cotton insulation. It can be used as sound-absorbing material, can be used as insulation material in the indoor quality process, we need to use its sound absorption performance control reverberation time, clarity of language and other indicators of architectural acoustics. In the engine room noise, damping device, wall insulation, and it is also used as insulation material. For more details, please consult the Sichuan Science and Technology Co., Ltd. Haiyan acoustics.