This part of IEC TS 62788 provides a method for measuring the adhesion energy of most interfaces within the photovoltaic (PV) module laminate.

In contrast to other adhesion tests in general use, this method provides a measure of adhesive energy, via the critical energy release rate, and so is more useful for comparing adhesion of different specimen types; e.g. different materials, module or coupon samples, or materials before and after stress exposure.

This is a “weakest link” test, meaning that the weakest interface is the one most likely to fail in a given test. Adhesion of a specific layer may be difficult to intentionally measure if there is a weaker interface in the system.