For the measurement a motorized 90° Peel Tester is used. Peel-tests are performed at constant angle perpendicular to the sample surface. The measurements are performed at constant velocity with a motorized peel tester (MV-220 Motorized Test Stand, Imada, Tokyo, Japan) and the force is measured with a force gauge (model ZP-5, Imada, Tokyo, Japan). The experiments are performed under defined relative humidity and temperature. The Peel-Test set-up is placed in a climate chamber where the humidity is adjustable.