GB/T 31899-2015Textile—Tests for weather resistance—UV light exposure (English PDF)
纺织品 耐候性试验 紫外光曝晒
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
September 11, 2015
Implementation date
April 1, 2016
Scope
GB/T 31899-2015 is the English-translated version of 纺织品 耐候性试验 紫外光曝晒.
GB/T 31899-2015 specifies the test method for UV light exposure ageing of textiles for outdoor use and for the determination of the changes in their performance before and after ageing.
Clause 1 states that it applies to all kinds of textile materials and products for outdoor use, and instead of an exclusion it refers to Annex A for the applications and limitations of the method.
The contents run from the scope, normative references and terms and definitions to clause 4 on the principle, clause 5 on test equipment, clause 6 on samples, clause 7 on test conditions, clause 8 on the test procedure, clause 9 on performance determination, clause 10 on test results and clause 11 on the test report, followed by informative Annex A on applications and limitations and informative Annex B on the typical spectral energy distribution of the fluorescent UV lamp.
Clause 3 defines the fluorescent UV lamp as a lamp of which at least more than 80 percent of the total light energy output is radiation energy in the ultraviolet region of the spectrum, for example below 400 nm, defines irradiance as the irradiance flux per unit area in the specified wavelength range in watts per square metre, and defines radiant energy as the time integral of the irradiance in joules per square metre; it also opens an entry for spectral energy distribution whose definition the preview does not print.
Annex A states that the method simulates the performance degradation caused by UV light and humidity in the natural world rather than all weather conditions, such as air pollution, biological erosion and salt water erosion, that different test conditions can give different results so the conditions must be described in the test report, and that the results serve to compare the weather resistance of materials after exposure by a given test method.
The same annex notes that the cutoff wavelength of short-wave UV radiation in outdoor exposure is generally believed to be 300 nm, that radiation below 300 nm may cause degradation reactions that do not occur in outdoor conditions, and that where the UV wavelength of the laboratory source is shorter than that of the actual operating conditions the degradation mechanism and the stability level found in the acceleration test can differ significantly.
Clause 2 cites GB/T 250. The standard was proposed by the China National Textile and Apparel Council and is under the jurisdiction of Subcommittee 1 of Technical Committee 209 on Textile and Apparel (SAC/TC 209/SC 1); the page places it at ICS 59.080.01 and Chinese classification W 04. It was issued on 11 September 2015 and has applied since 1 May 2016.
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Document preview — GB/T 31899-2015
National Standard of the People's Republic of China
- ICS
- 59.080.01
- Classification
- W 04
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword3
- 1 Scope4
- 2 Normative References4
- 3 Terms and Definitions4
- 4 Principle5
- 5 Test Equipment5
- 6 Samples7
- 7 Test Conditions7
- 8 Test Procedure7
- 9 Performance Determination8
- 10 Test Results8
- 11 Test Report9
- Annex A (Informative) Applications and Limitations10
- Annex B (Informative) Typical Spectral Energy Distribution of Fluorescent UV lamp11
Foreword
This Standard was drafted according to the rules given in GB/T 1.1-2009.
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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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
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- GB/T 17641-2017Geosynthetics—Slit and split film yarn woven geotextiles
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