Features: RW stone wool ceiling tiles are primarily made from abundantly available basalt rock and contain up to 42% recycled materials. Stone wool has no nutritional value and therefore it provides no sustenance to harmful micro-organisms. With high acoustic ,insulation, fireproof, sag resistance performance. Application: Cinema, Theater, Auditorium, Gymnasium, Library, School, Coffee Bar, Restaurant, Shopping Center etc. Product Data: Fireproof: Class A Acoustical: NRC 0.7-0.95 Sag resistance: RH99 Hygienic Properties: Stone wool has no nutritional value and therefore it provides no sustenance to harmful micro-organisms. Size(mm): 600x600, 300x1200, 600x1200 Thickness(mm): 15, 20, 25 ,30,40 Other size can be customized.