Compressive strength of vacuum insulation panels according to EN 826: difficulties with the measurement results for VIPs and possible solutions

Description of the project: Results of compressive strength according to EN 826 of VIPs without any facings (e.g. EPS, PU, etc.) are difficult to evaluate. The main reason is the absence of a linear range in the stress-strain graph, caused by warping of the panel, surface joints and the general behaviour of an inhomogeneous product under load. The consequence of this is that the values for the compressive strength for products on the market are highly depending on the skills of the testing laboratory and show a rather high range of diversity. This problem is very striking specially in thin panels like 10 mm or 20 mm. This project will describe possible approaches to eliminate the fortuity and to increase the reproducibility for the compressive strength measurement on VIP.