UNE-EN IEC 62788-5-1:2020

This part of IEC62788 provides procedures for standardized test methods for evaluating the properties of materials designed to be used as edge seals. When modules are constructed with impermeable (or extremely low permeability) front- and backsheets designed to protect moisture sensitive photovoltaic (PV) materials, there is still the possibility for moisture to get in from the sides. This moisture ingress pathway may be restricted by using a low diffusivity material around the perimeter of a module between the impermeable front- and backsheets. Alternatively, one may wish to use a low diffusivity encapsulant which may significantly reduce moisture ingress over the lifetime of the module and would want it to be evaluated similarly to an edge seal material.In addition to restricting moisture ingress, edge seal materials must also provide electrical insulation. To perform these functions, edge seal materials must remain well adhered.The test methods here are intended to be used to standardize the way edge seals are evaluated. Only some of these tests are actually required for IEC qualification tests for PV modules and that status depends on the application. It is not required that all of these tests be performed, but it is recommended that these properties be measured as indicated.