Product Description: Closed-cell foam aluminum panels are made into high-efficiency sound-absorbing panels after perforation treatment (Φ2mm holes, perforation rate of 1-3%), which have excellent sound-absorbing performance, and the sound-absorbing rate can reach 60% to 90%. Since the surface of this material has no plane, it has excellent surface diffuse reflection sound absorption function, and at the same time, it has the sound absorption function of perforated Helmholtz resonance acoustic absorber, which ensures a high sound absorption rate. In addition, in the humid environment, ordinary acoustic material absorbs water and expands, the sound absorption coefficient is greatly reduced, while the aluminum foam material does not absorb water, its sound absorption rate does not decrease. Aluminum foam plate behind the set of different thickness of the air layer, the main frequency of sound absorption is different, with the thickness of the air layer from 0mm to 90mm, the main frequency of sound absorption from 2000Hz down to 300Hz or so. When the thickness of the air layer is 10, 30, 60, 90mm, the main frequency of the maximum sound absorption rate are 1000Hz, 500Hz, 400Hz, 300Hz or so. According to the noise frequency distribution design foam rate acoustic panel behind the air layer thickness. Highway, under-river tunnels, undersea tunnels and other automobile generated noise main frequency of about 400Hz, for low-frequency noise, so the highway sound barriers, under-river and undersea tunnels sound-absorbing wall aluminum foam acoustic panels behind the setting of the 60mm thick air layer, noise reduction effect is good. Railroad noise is medium and high frequency noise above 1000Hz, 20mm thick air layer is set behind the aluminum foam sound-absorbing plate with good noise reduction effect. Product Characteristics: Density: 0.25g/cm3～0.75g/cm3; Void rate: 75%～90%; Absorption energy: 8J/m3 ~ 30J/m3; Compressive strength: 3Mpa ~ 17Mpa; Flexural strength: 3Mpa～15Mpa; Aperture: uniformly distributed 1-10mm, main aperture 4-8mm; Fireproof performance does not burn, does not produce toxic gases; Corrosion resistance, long service life. Product specification: 1200mm*600mm*H or customized production according to customer requirements.