Testing artificially aged silicone sealants for advanced applications

Silicone sealants have been applied for more than 40 years to structurally bond glass onto steel or aluminum frames. One of the reasons is the unique resistance to weathering in normal assembly situations.

With vertically installed facades, there can be installation assemblies with horizontal silicone joints, on which standing water cannot be avoided. Despite the assumed, good weathering resistance of silicone, this particular situation must be investigated. At the University of the German Federal armed forces Munich, Silicone samples were artificially aged in various chemical solutions and analyzed using microcomputer tomography and infrared spectroscopy to describe the ageing behavior. The investigations show the suitability as well as challenges of the chosen methods for the description of the ageing behaviour of silicone sealants.