... rubber. 1, Dscription 690 Damping sheet is a type of solvent-free, non-spoliation sheet sealing material which is made from high quality ... one of the best damping, reinforcement, noise reducing material. 2, Application area Sealing, damping, heat insulation for auto body, auto air ... StorerageShelf life is 24 months. This product is non-flammable material, but don't store them near the heat source, and ...