... 2)Class A1 Non-combustiblity 3)thermal insulation,sound absorption High quality water heater insulation blanketDescription:We are top manufacturer of Centrifugal Glass ... 3007-1982Grade of combustibility Non-combustible Grade A1GB 8624-1997Reshrinking temp. ≥250GB/T 11835-1998Thermal conductibilityw/m.k0.038-0. ... roll5000-30000120025-15012,16,20,24,32,40,48 High quality water heater insulation blanket