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BSI BS EN IEC 62788-6-2:2020

Measurement procedures for materials used in photovoltaic modules -- General tests. Moisture permeation testing of polymeric materials
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BSI BS EN IEC 62788-6-2:2020

Measurement procedures for materials used in photovoltaic modules -- General tests. Moisture permeation testing of polymeric materials

PUBLISH DATE 2020
PAGES 24
BSI BS EN IEC 62788-6-2:2020

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 (Ƭ10) (defined as the time to reach 10 % of the steady state WVTR) for 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.

SDO BSI: British Standards Institution
Document Number IEC 62788-6-2
Publication Date May 13, 2020
Language en - English
Page Count 24
Revision Level
Supercedes
Committee GEL/82
Publish Date Document Id Type View
May 13, 2020 BS EN IEC 62788-6-2:2020 Revision