... absorption coefficient 3. non-combustible 4. dust-free studio acoustic panelStructure: filled with non-combustible and micro-perforated ... , office, cinema, theater, concert hall, gymnasium, recording room, studio, conference hall, exchange, business hall, karaoke hall, ball room, ... size: 1200×600×25mm, 600×600×25mmFlame retardance: Class BAcoustic performance:Model: [QY-XT-A025] 25mm thickness Test ...