A characterization of the physical properties of materials is an important condition for the reliability assessment, age determination and the quality assurance of PV module components. Apart from standard test methods (e.g. tensile and bending tests, peel tests) the Fraunhofer CSP also offers special customized test procedures, such as the strength assessment of encapsulated solar cells and an in-laminate fatigue strength evaluation of solar cell interconnectors. These tests may always constitute the basis for model building and further simulations. In addition, individual tests can be carried out and developed on request of our customers. In combination with age tests, we are able to retrace the alteration of material properties.