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GB/T 31899-2015 English PDF (GBT31899-2015)

GB/T 31899-2015 English PDF (GBT31899-2015)

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GB/T 31899-2015: Textile -- Tests for weather resistance -- UV light exposure

This Standard specifies the test method for UV light exposure ageing and the determination of changes in performance before and after ageing of the textiles for outdoor use.
GB/T 31899-2015
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 59.080.01
W 04
Textile ?€? Tests for Weather Resistance ?€?
UV Light Exposure
ISSUED ON. SEPTEMBER 11, 2015
IMPLEMENTED ON. MAY 1, 2016
Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 4
4 Principle ... 5
5 Test Equipment ... 5
6 Samples ... 7
7 Test Conditions ... 7
8 Test Procedure ... 7
9 Performance Determination... 8
10 Test Results ... 8
11 Test Report ... 9
Annex A (Informative) Applications and Limitations ... 10
Annex B (Informative) Typical Spectral Energy Distribution of Fluorescent UV lamp ... 11
Foreword
This Standard was drafted according to the rules given in GB/T 1.1-2009. This Standard was proposed by China National Textile and Apparel Council. The Standard shall be under the jurisdiction of the Subcommittee 1 of Technical Committee 209 on Textile and Apparel of Standardization Administration of China (SAC/TC 209/SC 1).
The drafting organizations of this Standard. Hangzhou Paradise Umbrella Group Co., Ltd., China Textile Testing and Certification Service, Jiangxi Changshuo Outdoor Textile Co., Ltd., (China) Rixin Textile Co., Ltd., Norinco Group No. 59 Institute and U.S. Q- Lab Corporation Shanghai Office.
The main drafters of this Standard. He Lingjun, Zhang Lili, Xu Lu, Xu Baiqing, Lv Shiliang, Tian Yue?€?e, Zhang Heng and Sun Xinglei.
Textile ?€? Tests for Weather Resistance ?€?
UV Light Exposure
1 Scope
This Standard specifies the test method for UV light exposure ageing and the determination of changes in performance before and after ageing of the textiles for outdoor use.
This Standard is applicable to all kinds of textile materials and products for outdoor use.
Note. See Annex A for the applications and limitations of this method.
2 Normative References
The following documents are essential to the application of this Standard. For the dated references, only the dated editions are applicable to this Standard. For the undated references, their latest editions (including all amendments) are applicable to this Standard.
GB/T 250 Textiles - Tests for Colour Fastness - Grey Scale for Colour
3 Terms and Definitions
For the purpose of this Standard, the following terms and definitions apply. 3.1 Fluorescent UV lamp
The fluorescent lamp which produces radiation energy in the ultraviolet region of the spectrum (e.g. below 400 nm) more than 80% of the total light energy output at least. 3.2 Irradiance
The irradiance flux per unit area in the specified wavelength range, in watt(s) per square meter (W/m2).
3.3 Radiant energy
The time integral of the irradiance, in joule(s) per square meter (J/m2). 3.4 Spectral energy distribution
Annex A
(Informative)
Applications and Limitations
A.1 In this Standard, it simulates the performance degradation of the materials caused by the UV light and humidity conditions in the natural world, other than simulates all weather conditions, such as air pollution, biological erosion and salt water erosion.
A.2 Different test conditions can result in different test results. Therefore, the test conditions shall be described in the test report; otherwise, the test results can?€?t be used as reference.
A.3 The test results obtained from this Standard are used to compare the weather resistances of the materials after exposure of a certain test method.
A.4 The correlation between the laboratory light source acceleration test and the actual outdoor exposure is subject to a number of factors. The spectral distributions of laboratory light source and sunlight are different. In a laboratory acceleration test, a wavelength shorter than normal wavelength is used frequently to obtain a faster ageing speed. For an outdoor exposure, cutoff wavelength of its short-wave UV radiation is generally believed to be 300 nm. Under the exposure to the UV radiation of less than 300 nm, degradation reaction may be caused, but this reaction will not occur in outdoor conditions. If the wavelength of the UV radiation contained in the laboratory light source used in the acceleration test is less than the wavelength of the actual operating conditions, then the degradation mechanism and the material stability level in the acceleration test can be different significantly.
A.5 If the radiation of a certain area can cause the degradation of the material tested, it is not necessary to simulate all spectrums of sunlight if the stability level of the material is not changed. However, for the UV light or the laboratory light source with visible light spectrum, there is usually strong emission spectrum within a narrow wavelength range. It may cause some unexpected results. This type of light source may not cause the changes of sunlight exposure. The exposure to the only light source of UV radiation may not cause the same colour fading as that caused by visible light; or it may cause greater polymer yellowing changes than that caused by sunlight exposure.

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