Wellyoung MgO Perforated Panel is used high quality magnesium cement as its substrate material, then paint emulsion paint of acrylic acid on it, and cover high quality anti-dust cloth on the surface at last. A first grade incombustible sound- absorbing board to have durability strong against heart, moisture and shocks, being economical, and to show high sound absorption rate(250~1000Hz) in medium/low frequency bands, as an harmless and eco-friendly material without mold or bacterium propagation, as well as a perforated board with optimal porosity rate on a natural inorganic(magnesium). Materials Base material: Mgo board Surface material: black painting Back material: black non-woven cloth Bending strength 15Mpa (GB/T7019-1997) Density 0.9-1.2g/cm3 absorbing water rate 15% (JC688-1998) Fireproof characteristic A grade not combustible (GB8624-1997) Thermal resistance 1.14m2K/W (GB/T13475-92) The corner is dealt with Bright shelf platform/drops Security 100% does not include such harmful substance as the asbestos and etc Radioactivity Not limited by the scope of application (GB6763-2000) Size of perforated gypsum board 197*2440*12mm, 197*2440*15mm Specification of holes Ordinary round hole 3mm, 6mm, 8mm, 10mm, 12mm, 15mm Ordinary square hole 10mm, 12mm Cross-hole 6/10mm, 8/12mm, 12/20mm Micro-pores 3mm, 5mm Honeycomb hole 10mm Slotted holes 4/14mm( round hole) 6/80mm( square hole) Irregular Holes 8/15/20mm, 12/20/35mm Applications: Theater, cinema, recording studio, office, television broadcasting station, gymnasium,conference hall, multifunction hall, recording studios, cinema, boardrooms,theatres, churches, court rooms, hotel foyers, reception areas, schools, KTV and vil