Fatigue resistance of double sealant composed of polyisobutylene sealant adjacent to silicone sealant

With the aid of current sealant technologies, a double sealant comprising adjacent silicone and polyisobutylene sealants may be used to enhance the durability of buildings. The inner silicone sealant is quite durable owing to its intrinsic properties, and covering it with an outer polyisobutlylene sealant prevents fouling due to silicone sealant. This study indicates that the fatigue resistance of double sealant joints is strongly correlated with both the total sealant depth and the movement intervention of each sealant. Furthermore, the proposed section dimension factors enable the design of sealants with appropriate section sizes through better prediction of the fatigue resistance.