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IEC 62788-6-2 Ed. 1.0 b:2020

Measurement procedures for materials used in photovoltaic modules - Part 6-2: General tests - Moisture permeation testing of polymeric materials
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IEC 62788-6-2 Ed. 1.0 b:2020

Measurement procedures for materials used in photovoltaic modules - Part 6-2: General tests - Moisture permeation testing of polymeric materials

PUBLISH DATE 2020
PAGES 42
IEC 62788-6-2 Ed. 1.0 b:2020

Measurement procedures for materials used in photovoltaic modules - Part 6-2:

General tests - Moisture permeation testing of polymeric materials

IEC 62788-6-2:2020 provides methods for measuring the steady-state water vapour transmission rate (WVTR), water vapour permeability (P), diffusivity (D), solubility (S), and moisture breakthrough time (10) (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.

SDO IEC: International Electrotechnical Commission
Document Number IEC 62788
Publication Date March 1, 2020
Language b - English & French
Page Count
Revision Level 1.0
Supercedes
Committee 82
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