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GB/T 45939-2025Co-extrusion encapsulant film for photovoltaic module (English PDF)

光伏组件封装用共挤胶膜

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

August 1, 2025

Implementation date

November 1, 2025

Scope

GB/T 45939-2025 is the English-translated version of 光伏组件封装用共挤胶膜.

GB/T 45939-2025 covers the co-extruded film used to encapsulate photovoltaic modules, made from ethylene-vinyl acetate copolymer and polyolefin elastomer resins with additives, melt-extruded and co-cast into a multi-layer film.

It defines the terms, among them co-extrusion film and surface density, and sets the requirements for appearance, for specifications and their deviations and for physical properties.

It describes the test methods, with the sampling method, the test conditions, the appearance inspection and the determination of specifications, deviations and physical properties, and it gives the inspection categories and items and the packaging, marking, transport and storage.

It applies to films for crystalline silicon module encapsulation and is used as a reference for thin-film modules. It was issued on 1 August 2025 and has applied since 1 November 2025.

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Document preview — GB/T 45939-2025

National Standard of the People's Republic of China

ICS: 31.030
Classification: L 90

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Preface
1 Scope
2 Normative references
3 Terms and Definitions
4 Requirement
4.1 Appearance
4.2 Specifications and deviations
4.3 Physical properties
5 Test Method
5.1 Sampling method
5.2 Test conditions
5.3 Appearance Inspection
5.4 Specifications and deviation determination
5.5 Physical properties determination
6 Inspection Rules
6.1 Inspection categories
6.2 Inspection Item
7 Packaging, labeling, transportation and storage
7.1 Packaging
7.2 Sign
7.3 Transportation
7.4 Storage

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.

1 Scope

This document defines the terms and definitions of co-extruded films for photovoltaic module encapsulation (hereinafter referred to as "co-extruded films"), and specifies the requirements, inspection regulations, it also describes the rules, packaging, labeling, transportation and storage, and the corresponding test methods.

This document is applicable to co-extruded films for crystalline silicon photovoltaic module encapsulation and is used as a reference for films for thin-film module encapsulation.

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document.

For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to this document.

GB/T 1033.1 Plastics - Determination of density of non-cellular plastics - Part 1: Immersion method, pycnometer method and titration method

GB/T 1408.1 Test methods for electric strength of insulating materials Part 1: Tests at power frequency

GB/T 2410 Determination of light transmittance and haze of transparent plastics

GB/T 2790 Adhesives - 180° peel strength test method - Flexible materials to rigid materials

GB/T 2828.1 Sampling procedures for inspection by attributes Part 1: Sampling plans for batch inspection based on acceptance quality limit (AQL)

GB/T 4207 Determination of tracking resistance index and relative tracking index of solid insulating materials

GB/T 29848-2018 Ethylene-vinyl acetate copolymer (EVA) film for photovoltaic module encapsulation

GB/T 31838.2 Dielectric and resistive properties of solid insulating materials Part 2: Resistance properties (DC method) Volume resistance and volume resistivity

GB/T 39822 Determination of yellowness index and its variation value of plastics

GB/T 41203-2021 Accelerated aging test method for photovoltaic module packaging materials

IEC 61215-2:2021 Terrestrial photovoltaic modules design qualification and type approval Part 2: Test procedures

3 Terms and Definitions

The following terms and definitions apply to this document.

3.1 Co-extrusion film

Ethylene-vinyl acetate copolymer (EVA) resin and polyolefin elastomer (POE) resin are used as two main raw materials, and multiple The additives are melt-extruded, compounded and co-cast to form a packaging film with a multi-layer structure.

Note: Polyolefin elastomers mainly refer to copolymers of ethylene and alpha-olefins (1-butene, 1-hexene, 1-octene, etc.).

3.2 Surface density

The mass per unit area of co-extruded film.

Note 1: Also known as gram weight.

Note 2: The unit is grams per square meter (g/m2).

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Normative references

IEC 61215-2:2021

Similar standards

GB/T 28159-2025|GB/T 28859-2025|GB/T 29846-2025|GB/T 29847-2025|GB/T 31379.1-2025|GB/T 31379.2-2025

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