Perforated sound barriers eliminate the noise by the effect of resonance, has the following characters: Aesthetic: various holes shapes, colors and styles can be chosen, harmonizing with the ambient environment. Economical: install by assembling and infilling, improve the efficiency, save costs and time.. Durable: light weight, water proof, heat resistant, fire-proof, ultraviolet rays -resistant and weather and climate resistant. Applications: widely used as environmental noise barriers, building walls, generator room, factory, and other noise source sound-absorbing board, sound-absorbing material of the ceiling, wall. It also used in filter of mine, medicine, ventilate of grain depot, sound insulation of room, highway, railroad, city overpasses, tunnels, elevated highways in city, machine-protecting and decoration, etc. Acoustic absorption capacity: >50db, soud proof rate: NRC>0.863