IEC 62788-1-5:2016 PDF

Overview

IEC 62788-1-5:2016 is an international standard published by the International Electrotechnical Commission (IEC) that establishes a standardized measurement procedure for evaluating the change in linear dimensions of encapsulant sheet materials subjected to thermal conditions, such as those encountered during photovoltaic (PV) module fabrication. Specifically, this method quantifies the maximum representative dimensional change of encapsulation sheets after unrestricted thermal exposure, which is critical for quality assurance and product transparency in PV module manufacturing.

This standard is a vital resource for both encapsulation material manufacturers and PV module producers. Its procedures help ensure consistency, reliability, and quality control in the production and supply chain of photovoltaic modules by documenting how encapsulation materials react to thermal processing.

Key Topics

• Standardized Test Method: Describes a detailed procedure to measure the change in length and width of encapsulant sheet materials after exposure to specific thermal conditions, simulating PV module manufacturing environments.

• Applicability: Provides guidance for encapsulant manufacturers for internal quality control and for publishing data in product datasheets. PV module manufacturers use the results for assessing material suitability, process optimization, design validation, and failure analysis.

• Sample Preparation and Testing:

  • Details on specimen cutting, marking, and measurement
  • Requirements for measurement precision and preconditioning
  • Use of controlled ovens and friction-reducing substrates (sand over aluminum) to ensure accurate, reproducible results

• Data Reporting: Clear reporting requirements, including maximum size change, mean, standard deviation, and uncertainty, are provided to allow for traceable and comparable data across the PV industry.

• Extensibility: Although focused on encapsulants, the standard’s methodology may be referenced when testing related polymeric materials, such as PV module backsheets and frontsheets.

Applications

• Quality Control: Enables encapsulant material manufacturers to monitor and manage production quality across batches by periodically assessing the thermal dimensional stability of materials.

• Product Datasheets: Establishes a reliable baseline for encapsulant performance data, supporting accurate technical datasheets that module manufacturers and purchasers can rely on for material selection.

• Material Acceptance and Development: Supports PV module manufacturers in evaluating encapsulant materials for initial acceptance, process tuning, and ongoing performance optimization.

• Design and Failure Analysis: The data obtained can be used in engineering analyses for stress modeling, design margin assessment, and investigation of module failures linked to encapsulant shrinkage or expansion.

• Cross-material Comparisons: Offers a consistent approach to screen and compare encapsulation materials from different suppliers, facilitating informed procurement and supply chain decisions.

Related Standards

• IEC 62788 Series: This standard is a part of the larger IEC 62788 family, which encompasses a range of test methods for materials used in photovoltaic modules.

  • Other parts address different properties or materials, such as backsheets and frontsheets (see IEC 62788-2).

• ISO/IEC 17025: Lays down general requirements for testing and calibration laboratories, relevant for the accreditation of facilities carrying out tests per IEC 62788-1-5.

• ISO 291: Specifies standard atmospheres for conditioning and testing materials, referenced for specimen preparation.

• ASTM C778: Provides specifications for standard sand, used as a friction-reducing layer in the testing procedure.

• IEC 60216-4-1: Relates to ageing ovens and their use in material endurance testing, referenced for the equipment setup.

Practical Value

By employing IEC 62788-1-5:2016, the PV industry benefits from standardized, reproducible, and transparent encapsulant testing. This enhances quality control, supports global trade, and reduces risk in both module production and field performance, contributing to the overall reliability and competitiveness of photovoltaic technologies. Effective use of this standard underpins best practices in PV module manufacturing and ensures alignment with international requirements for PV material qualification.