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GB/T 20236-2025: Accelerated outdoor weathering test methods for nonmetallic materials using concentrated natural sunlight
Status: Valid
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 20236-2025 | English | 439 |
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Accelerated outdoor weathering test methods for nonmetallic materials using concentrated natural sunlight
| Valid |
GB/T 20236-2025
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| GB/T 20236-2015 | English | 339 |
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Accelerated outdoor weathering test methods for nonmetallic materials using concentrated natural sunlight
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GB/T 20236-2015
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| GB/T 20236-2006 | English | 599 |
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Accelerated outdoor weather test methods for nonmetallic materials using concentrated natural sunlight
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GB/T 20236-2006
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Basic data | Standard ID | GB/T 20236-2025 (GB/T20236-2025) | | Description (Translated English) | Accelerated outdoor weathering test methods for nonmetallic materials using concentrated natural sunlight | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | K04 | | Classification of International Standard | 19.040 | | Word Count Estimation | 22,218 | | Date of Issue | 2025-03-28 | | Date of Implementation | 10/1/2025 | | Older Standard (superseded by this standard) | GB/T 20236-2015 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 20236-2025: Accelerated outdoor weathering test methods for nonmetallic materials using concentrated natural sunlight
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 19.040
CCSK04
National Standard of the People's Republic of China
Replaces GB/T 20236-2015
Test method for accelerated outdoor exposure of non-metallic materials to concentrated light
Released on 2025-03-28
2025-10-01 Implementation
State Administration for Market Regulation
The National Standardization Administration issued
Table of contents
Preface III
Introduction IV
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 General description of the test 1
5 Test equipment 2
6 Sample 6
7 Initial Testing 6
8 Preprocessing 6
9 Sample Installation 6
10 Experiment 7
11 Intermediate detection 8
12 Final Inspection 9
13 Report 9
Appendix A (Informative) Test Equipment Example 10
Appendix B (Informative) UV radiation meter sunshade installation example 12
Appendix C (Informative) Method for determining sunlight exposure 15
Reference 17
Figure 1 Schematic diagram of the optical system of the parabolic sun tracking and concentrating accelerated exposure equipment
Figure 2 Schematic diagram of the optical system of the parabolic solar tracking and concentrating accelerated exposure equipment
Figure 3 Spectral reflectivity of a common plane mirror
Figure 4 Spectral reflectivity of cold light plane mirror
Figure 5 Examples of correct and incorrect specimen installation 7
Figure A.1 Example of parabolic sun tracking and concentrating accelerated exposure equipment 10
Figure A.2 Example of parabolic solar tracking and concentrating accelerated exposure equipment11
Figure B.1 Overall appearance of the shutter in use 12
Figure B.2 Shader and support bar 13
Figure B.3 Shutter substrate 13
Figure B.4 Shader support 14
Figure B.5 Shader 14
Table 1 Annual average solar radiation and ultraviolet radiation at typical harsh environment locations at latitude angles
Table 2 Conventional water spray cycle of reflection system equipment 8
Table C.1 Parameters of the reflection system 15
Table C.2 Hd data for some days 16
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.
This document replaces GB/T 20236-2015 "Non-metallic materials accelerated outdoor exposure test method" and GB/T 20236-
Compared with.2015, in addition to structural adjustments and editorial changes, the main technical changes are as follows.
a) Deleted the content of “Significance and Application” (see Chapter 4 of the.2015 edition);
b) Added “General description of the test” (see Chapter 4);
c) The content of "Test Equipment" has been changed (see Chapter 5, Chapter 5 of the.2015 edition);
d) The content of "Sample" has been changed (see Chapter 6, Chapter 8 of the.2015 edition);
e) Deleted the contents of “reagents and materials”, “safety precautions” and “test evaluation” (see Chapter 6, Chapter 7,
Chapter 12);
f) Added “initial testing”, “pretreatment”, “intermediate testing” and “final testing” (see Chapter 7, Chapter 8, Chapter 11 and Chapter 12);
g) The content of “Sample Installation” has been changed (see Chapter 9, Chapter 9 of the.2015 edition);
h) The content of “Test Procedure” has been changed (see Chapter 10, Chapter 10 of the.2015 edition).
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document is proposed and coordinated by the National Technical Committee for Standardization of Environmental Conditions and Environmental Testing for Electrical and Electronic Products (SAC/TC8).
This document was drafted by. China Electric Power Research Institute Co., Ltd., Weikai Testing Technology Co., Ltd., State Grid Fujian Electric Power Co., Ltd.
Ltd., Kingfa Technology Co., Ltd., AMETEK Trading (Shanghai) Co., Ltd., Tsinghua University Shenzhen International Graduate School, Tianjin Aerospace
Ruilai Technology Co., Ltd., Vivo Mobile Communications Co., Ltd., Beijing University of Aeronautics and Astronautics, Sichuan University, Guangdong Energy Group Science and Technology Research
Institute Co., Ltd., Guangdong South China Household Electrical Appliance Research Institute.
The main drafters of this document are. Lü Tianyi, Liu Xin, Xu Fucong, Qin Jiaxiang, Cao Lingling, Xu Xuedong, Wang Xilin, Tao Youji, Wang Shouhe,
Zheng Ziying, Cui Yingwei, Wu Chunyu, Jia Zhidong, Yao Jun, Lü Yadong, Yao Yong, Xia Xiaojian, Lai Jing.
This document was first published in.2006, revised for the first time in.2015, and this is the second revision.
Introduction
Outdoor exposure test refers to placing the sample under natural atmospheric conditions and subjecting it to solar radiation, temperature, humidity, rainfall, salt spray and
At the same time, this method can also be used to strengthen one or some of the main factors that affect the degradation of material performance.
Environmental factors act to accelerate failure.
The concentrated light accelerated test method is to achieve rapid weathering of materials by enhancing the solar radiation received by the material surface in an outdoor natural environment.
Rapid evaluation test method.
Test method for accelerated outdoor exposure of non-metallic materials to concentrated light
1 Scope
This document describes the accelerated outdoor exposure test of non-metallic materials using an accelerated outdoor exposure test apparatus consisting of a Fresnel reflection system.
The test method is given, and the equipment used and its use guidelines are given.
This document is applicable to the evaluation of the durability of non-metallic materials used in outdoor environments under the influence of solar radiation, temperature and humidity.
This document does not give the most suitable test conditions for specific materials, but is limited to measurement methods and process controls.
2 Normative references
The contents of the following documents constitute 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 2422-2012 Guidelines for the preparation of environmental test methods - Terms and definitions
GB/T 14890 Calibration method for direct pyrheliometers
GB/T 19565-2017 Global pyranometer
GB/T 33868 Calibration method for ultraviolet radiation meters
GB/T 34048-2017 Ultraviolet radiation table
GB/T 37426 Plastic test specimens
GB/T 37468-2019 Direct radiation meter
3 Terms and definitions
The terms and definitions defined in GB/T 2422-2012 apply to this document.
4 General description of the test
The test results in this document can be used to compare the relative durability of materials tested for a specific period of time.
When a large number of outdoor exposure test results are sufficiently mathematically correlated, they can be considered to be representative of the results of natural or field exposure tests.
Due to the differences in solar radiation, temperature, pollutants, wetting time and other factors at different exposure sites,
The relative durability of materials subjected to natural or field exposure tests can vary significantly, so even if the results of accelerated tests under a particular condition can be
It is not a good way to compare the relative durability of materials exposed in a particular location, nor is it an indication of whether the same durability will be achieved at other locations.
result.
The types and formulations of materials are diverse, and it is not appropriate to use a single acceleration factor in outdoor exposure tests.
The level of radiation intensification affects each material type and its formulation differently. The acceleration factor for one material may not be applicable to another.
In addition, by using different reflector types and configurations, different acceleration factors can be obtained.
There are differences in the test results, so it is advisable to obtain a sufficient number of test results to determine the acceleration factor of the material.
Aging results will vary due to seasonal and annual variations in some important climatic factors, so the acceleration factor applies only to one exposure.
Open field.
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