This document provides methods for measuring the steady-state water vapour transmission rate (WVTR), water vapour permeability (P), diffusivity (D), solubility (S), and moisture breakthrough time (T₁₀) (defined as the time to reach 10 % of the steady state WVTR) for 10 polymeric materials such as encapsulants, edge seals, frontsheets and backsheets. These measurements can be made at selected temperatures and humidity levels as deemed appropriate for evaluation of their performance in PV modules. Measurement is accomplished by inspection of the transient WVTR curve and by fitting it to a theoretical Fickian model. This document is best applied to monolithic films. If multilayer films are used, the D and S values are only apparent values, but the steady-state values can still be measured.
This document was written for the measurement of water permeation, but it can equally be used for other permeants such as O₂ . In this case the same diffusion equations, fitting procedures, and scaling arguments are used.dition 1.0 2020-03 INTERNATIONAL STANDARD NORME INTERNATIONALE colour inside Measurement procedures for materials used in photovoltaic modules – Part 6-2: General tests – Moisture permeation testing of polymeric materials Procédures de mesure des matériaux utilisés dans les modules photovolta？ques – Partie 6-2: Essais génériques – Essais de perméation à l’humidité des matériaux polymères IEC 62788-6-2:2020-03(en-fr) THIS PUBLICAT