MATERIAL: Semirigid fiberglass with a painted woven textured fiberglass facing. SIZE: Nominal 2′×2′, 2′×4′, 4′×8′ THICKNESS: 1″ or 2″ APPLICATIONS: Ceiling tile applications where high acoustical performance is required. WEIGHT: 0.5 lb/sf for 1″, 1 lb/sf for 2″ FLAMESPREAD: Per E-84, 25 f/s, Smoked developed 50 LIGHT REFLECTANCE: LR-1 (actual .87) THERMAL RESISTANCE: 1″ = R-4 MAINTENANCE: Can be easily cleaned with soft brush or vacuum.