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XG Micro-perforated Metallic Noise-absorption Plate
Introduction 
XG micro-perforated metallic noise-absorption plate is developed independently by our company, and we have been applied for China’s patent.
Based on resonance sound absorption theory, micro-perforated resonance and acoustic resistance of composite noise-absorption plate are used in the process of producing XG micro-perforated metallic noise-absorption plate in order to eliminate noise. Also, anti-corrosion treatment has been made on the surface of micro-perforated plate.
XG micro-perforated metallic noise-absorption plate is composed of two parts: surface micro-perforated noise-absorption plate and sound insulation plate. On the basis of materials of surface micro-perforated noise-absorption plate, it can be categorized into metallic, organic and inorganic plate. Micro-perforated Metallic Plate may be stainless steel plate, galvanized iron sheet, anti-rust aluminum plate, anodized aluminum plate, aluminum alloy and so on. Micro-perforated organic plate may be polycarbonate plate, glass fiber reinforced plastics, laminated glass. Micro-perforated inorganic plate may be light calcium silicate plate, ALC. And noise insulation plate is generally galvanized steel sheet.
The noise-absorption material of XG micro-perforated noise barrier can be centrifugal glass wool noise-absorption cotton, inorganic and organic solid noise-absorption materials. It requires that the surface of noise-absorption material is alkali-free, hydrophobic glass cloth, and the content of impurities is more than 3%. In addition, the surface material is dampproof and non-absorbent.
The perforated percentage of XG micro-perforated noise barrier is strictly designed and it has no effect on noise-absorption performance according to the examined data. However, the form of the surface structure can be designed diversifiedly. This can guarantee the acoustic performance and meet aesthetic requirements.
The width, span, material and color of single barrier can be chosen according to design requirements. Anti-corrosion treatment, such as hot galvanizing and spray, has been made on the surface to can meet different, long-term requirements of practical applications. 
Appearance
  




Performance Index
Structural strength. Raw material and thickness are selected in accordance with given design requirements. In consequence, it can match the requirements of mechanics indexes such as designed wind load, fatigue, etc.
The specific performances are shown in the following table.
Number Items Performance Index
1 Noise Reduction Coefficient >=0.7
2 Sound Transmission Loss >=25db
3 Area Density >=20kg/m2 & <=40kg/m2
4 Bending Load Typhoon regions: >=3.5pa
5 Impact Resistance Be consistent with "Technique requirements and measurement of acoustic elements of railway sound barrier" (TB/T3122-2005).
6 Fireproof Performance The fireproofing grade should be equal to or above Grade B2 of "Classification for burning behavior of building materials and products" (GB8624 - 2006).
7 Deformation Resistance Be consistent with the maximum elastic deflection (<=U100) of "Technique requirements and measurement of acoustic elements of railway sound barrier" (TB/T3122-2005).
8 Weathering Performance Be consistent with "Technique requirements and measurement of acoustic elements of railway sound barrier" (TB/T3122-2005).
9 Service Life Not less than 25 years.
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