Product description Wellyoung acoustic perforated gypsum board is designed on the basis of helholtz resonance theorem, After perforated, the holes, board and the wall make up of many resonant cavities, when air molecules pass the holes, the resonant cavities will consume large quantities of sound energy. It is widely used in auditorium, office, cinema, hospital, school and so on. Size 1200x2400mm Thickness 12mm Size of hole Round, Square, Cross, Irregular, Micro, Rectangle, Perforation Patterns H1, H2, H2L, H4, H4L, H6, H8 Perforation Rate 6.8%-19.6% Sound Absorption NRC 0.70 Feature 1. Acoustic perforated gypsum board 2. Light weight in unit acreage 3. High edge rigidity 4. Strong nail pull resistance 5. Smooth,paintable surface 6. NO visible joints and grid 7. Sustainable,fully recyclable material 8. Installs on any standard drywall suspension system 9. Fireproof and stop burning 10. Moisture resistance,sag resistance