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GB/T 41203-2021 English PDF (GBT41203-2021)

GB/T 41203-2021 English PDF (GBT41203-2021)

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GB/T 41203-2021: Method for accelerated aging test of PV module encapsulating material

This document describes the accelerated aging test method for photovoltaic module encapsulating materials. This document is applicable to glass, encapsulating adhesive film, backplane, and other encapsulating materials for photovoltaic modules.
GB/T 41203-2021
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 31.030
CCS L 90
Method for accelerated aging test of PV module
encapsulating material
ISSUED ON. DECEMBER 31, 2021
IMPLEMENTED ON. JULY 1, 2022
Issued by. State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms and Definitions... 4
4 Instruments and equipment... 5
4.1 High pressure cooking aging test box... 5
4.2 UV high temperature and high humidity aging test box... 5
5 Sample preparation... 5
6 Test steps... 6
6.1 Sample pretreatment... 6
6.2 Initial performance test... 6
6.3 High pressure cooking test (PCT test)... 6
6.4 Ultraviolet high temperature and high humidity test... 7
6.5 Performance test after aging test... 7
7 Test data processing... 7
8 Test report... 7
Method for accelerated aging test of PV module
encapsulating material
1 Scope
This document describes the accelerated aging test method for photovoltaic module encapsulating materials.
This document is applicable to glass, encapsulating adhesive film, backplane, and other encapsulating materials for photovoltaic modules.
2 Normative references
The following documents contain the provisions which, through normative reference in this document, constitute the essential provisions of this document. For the dated referenced documents, only the versions with the indicated dates are applicable to this document; for the undated referenced documents, only the latest version (including all the amendments) is applicable to this document.
GB/T 1040.3 Plastics -- Determination of tensile properties -- Part 3.Test conditions for films and sheets
GB/T 2790 Adhesives, 180?? peel strength test method for a flexible-bonded-to-rigid test specimen assembly
GB/T 31034 Insulating back sheet for crystalline silicon terrestrial photovoltaic (PV) modules
JC/T 2170 Anti-reflective coated glass for photovoltaic modules
ASTM E 313 Standard Practice for Calculating Yellowness and Whiteness Indices from Instrumentally Measured Color Coordinates
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1 Retention rate
The ratio of the value after the test to the value before the test.
3.2 Yellowness index difference
??YI
The difference between the yellowness index YI after the test and the yellowness index YI before the test.
4 Instruments and equipment
4.1 High pressure cooking aging test box
The temperature control accuracy shall be ??0.5 ???, the relative humidity control accuracy shall be ??3%, and the air pressure in the test box shall change with the temperature and humidity.
4.2 UV high temperature and high humidity aging test box
Ultraviolet spectral distribution. 280 nm~400 nm [Middle-wave ultraviolet (UVB) wavelength is 280 nm~320 nm, and long-wave ultraviolet (UVA) wavelength is 320 nm~400 nm]; the irradiation intensity shall meet the ultraviolet irradiation conditions required for the test; the irradiation uniformity shall be better than ??15%; temperature control accuracy shall be ??2.0 ???, and temperature fluctuation shall be ??? ??1.0 ???; relative humidity control accuracy shall be ??3%, and relative humidity fluctuation shall be ??? ??(3~5)%; effective irradiation area shall be at least 400 mm??300 mm. 5 Sample preparation
5.1 Glass samples for photovoltaic modules. The size should be 300 mm??300 mm, and the number of samples should be 3 pieces.
5.2 Encapsulating adhesive film sample. After stacking the glass, adhesive film, and backplane in sequence, put it into a vacuum laminating machine, and perform curing and crosslinking according to the curing temperature and time required by the product to obtain a laminate. The glass shall be ultra-white patterned glass; the backplane shall have a composite structure; the size of the laminate should be 300 mm??300 mm, and the appearance shall not have obvious bubbles and delamination. The number of samples is 3.
5.3 Photovoltaic backplane samples. They are divided into bare chip samples and laminate samples. After stacking the glass, adhesive film, and backplane in sequence, put it into a vacuum laminating machine, and perform curing and crosslinking according to the curing temperature and time required by the product to obtain a laminate. The glass shall be ultra-white patterned glass, and the encapsulating adhesive film shall be ethylene-vinyl acetate copolymer (EVA) adhesive film with a degree of Note 2.In addition to the recommended test time, other test time can be agreed upon between the supplier and the buyer.
6.4 Ultraviolet high temperature and high humidity test
Put the sample into the ultraviolet high temperature and high humidity aging test box, and the test conditions are as follows. the sample?€?s test temperature is 85 ?????2 ???; the relative humidity is 85%??2%; the ultraviolet spectral distribution is 280 nm~400 nm [middle-wave ultraviolet (UVB) wavelength is 280 nm~320 nm, and long-wave ultraviolet (UVA) wavelength is 320 nm~400 nm]; the irradiation intensity is 150 W/m2~200 W/m2, and UVB accounts for 3%~10% of UV(A+B) energy. The
cumulative irradiation amount of the glass used for photovoltaic modules should be 30 kW ?€? h/m2, 45 kW ?€? h/m2, 60 kW ?€? h/m2; the cumulative irradiation amount of the encapsulating adhesive film should be 30 kW ?€? h/m2, 45 kW ?€? h/m2, 60 kW ?€? h/m2; the cumulative irradiation amount of the photovoltaic backplane should be 45 kW ?€? h/m2, 60 kW ?€? h/m2, 75 kW ?€? h/m2.Close the box door and run the program.
Note. In addition to the recommended cumulative irradiation amount, other irradiation amounts can be agreed upon by the supplier and the buyer.
6.5 Performance test after aging test
After the aging test, take out the sample and test the performance of the sample after aging according to the test items in Table 1.
7 Test data processing
7.1 For glass used for photovoltaic modules, test the sunlight effective transmittance (380 nm~1100 nm) before and after the aging test according to the stipulations in Table 1, and calculate the difference according to the provisions in JC/T 2170. 7.2 For the encapsulating adhesive film, test the yellowness index YI and peeling strength of the glass surface of the sample before and after the aging test according to the stipulations in Table 1, and calculate the yellowing index ??YI.
7.3 For the photovoltaic backplane, test the yellowness index YI, elongation at break, and peeling strength of the samples before and after the aging test respectively according to the stipulations in Table 1, and calculate the yellowing index ??YI and the retention rate of elongation at break.
8 Test report
Unless otherwise specified, the report shall include the following.

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