WELLYOUNG Perforated gypsum board WELLYOUNG Acoustic Board is a perforated 12mm gypsum board with air-cleaning effect including black or white acoustical EU standard Ahlstrom non-woven fabric on the back(special color when ordering). Main Features Acoustic perforated gypsum board Light weight in unit acreage High edge rigidity Strong nail pull resistance Smooth,paintable surface NO visible joints and grid Sustainable,fully recyclable material Installs on any standard drywall suspension system Green environmental protection material Core material high grade glass fiber reinforced gypsum board Surface finish Front:white thick paper covering, 160G/SQM Back:High quality EU standard Ahlstrom non-woven fabric Size 1200*2400mm Thickness 12mm Dentisy 9.4kg/m2 Color White perforation Circle hole 6/25(18)R 8/25R 12/25R Cross hold 8/12/50R Long Round hole 4*14LR Irregular hole (pop hole) 8/15/20R More design can be customized according to you requirements. Patterns H8-L4W2 Perforation rate 8.8%-14.2% NRC 0.70 RH 70