1. KPS acoustic decorative board is made of wool fiber 2. It is free of formaldehyde 3. Perfect human comfortableness ... (R value): larger than 1.25(m2.k)/W 11.Application: cinema, theater, hotel, conference room, gymnasium, school, library, auditorium ... :1.5 kg/, thickness: 6.5mm) Back attached layer: perforation cement board (areal density: 8kg/, thickness:5mm, perforation rate: 23%) Connecting ...