BS EN IEC 62788-5-1:2020
$142.49
Measurement procedures for materials used in photovoltaic modules – Edge seals. Suggested test methods for use with edge seal materials
| Published By | Publication Date | Number of Pages |
| BSI | 2020 | 24 |
This part of IEC 62788 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 can be restricted by using a low-diffusivity material around the perimeter of a module between the impermeable front- and backsheets. Alternatively, it can be desirable to use a low-diffusivity encapsulant, which may significantly reduce moisture ingress over the lifetime of the module, and to evaluate it in a similar way to an edge seal material.
In addition to restricting moisture ingress, edge seal materials also provide electrical insulation. To perform these functions, edge seal materials are relied upon to adhere well.
The test methods described in this document are intended to be used to standardize the way edge seals are evaluated. Only some of these tests are applied for IEC 61215 and IEC 61730, and that status depends on the specific design. It is not required that all of these tests be performed, but that if these measurements are made that they be performed as outlined here.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 5 | Annex ZA(normative)Normative references to international publicationswith their corresponding European publications |
| 7 | English CONTENTS |
| 8 | FOREWORD |
| 10 | 1 Scope 2 Normative references |
| 11 | 3 Terms,definitions and symbols |
| 12 | 3.1 Terms and definitions 3.2 Symbols 4 Recommended tests 4.1 General 4.2 Moisture permeation properties 4.2.1 Moisture breakthrough time 4.2.2 Fickian materials |
| 13 | 4.2.3 Non-Fickian materials 4.3 Electrical properties 4.3.1 Dielectric strength of the film |
| 14 | 4.3.2 Volume resistivity 4.3.3 Comparative tracking index 4.4 Adhesion testing 4.4.1 General 4.4.2 Lap shear strength |
| 15 | 4.4.3 “T” peel test Figures Figure 1 – Lap shear test sample for proving cemented joint |
| 16 | 4.4.4 90° peel test 4.4.5 Butt joint test |
| 17 | 4.5 Durability of the materials 4.5.1 Relative thermal endurance 4.5.2 Dielectric strength degradation Figure 2 –Photograph (a)) and schematic (b)) of a z-tensile adhesion test specimen |
| 18 | 4.5.3 Accelerated stress testing Figure 3 – Schematic of test structure for RTI or RTE dielectric durability testing |
| 19 | Figure 4 – Test flow for cemented joint evaluation |
| 20 | 4.6 Flame resistance 4.7 Coefficient of thermal expansion 4.8 Rheological properties 4.8.1 Complex shear modulus 4.8.2 Melt flow rate 4.9 Other data 5 Test report |
| 22 | Bibliography |
