GB/T 8427-2019 English PDF (GBT8427-2019)

Delivery: 3 seconds. Download true-PDF + Invoice.
Get QUOTATION in 1-minute: Click GB/T 8427-2019
Historical versions: GB/T 8427-2019
Preview True-PDF (Reload/Scroll if blank)

GB/T 8427-2019: Textiles -- Tests for color fastness -- Color fastness to artificial light: Xenon arc
GB/T 8427-2019
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.080.01
W 04
Replacing GB/T 8427-2008
Textiles - Tests for color fastness - Color fastness to
artificial light: Xenon arc
(ISO 105-B02:2014, Textiles - Tests for color fastness - Part B02: Color
fastness to artificial light: Xenon arc fading lamp test, MOD)
ISSUED ON: DECEMBER 31, 2019
IMPLEMENTED ON: JULY 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 7 
2 Normative references ... 7 
3 Terms and definitions ... 8 
4 Principle ... 9 
5 Reference materials and apparatus ... 10 
5.1 Reference materials ... 10 
5.2 Apparatus ... 11 
6 Preparation of test specimens ... 13 
7 Exposure conditions ... 14 
8 Procedure ... 15 
8.1 Apparatus set-up ... 15 
8.2 Adjustment of the effective humidity (see Clause 7 and Annex E) ... 15 
8.3 Exposure methods ... 17 
9 Assessment of color fastness to light ... 26 
10 Test report ... 28 
Annex A (Informative) General information on color fastness to light ... 31 
Annex B (Informative) Light exposure equivalents for blue wool references L2
to L9 ... 34 
Annex C (Normative) Requirements for xenon arc lamp exposure devices ... 35 
Annex D (Normative) Procedures for measuring the irradiance uniformity in the
specimen exposure area (for apparatus manufacturers only) ... 39 
Annex E (Informative) Guidelines for conducting testing ... 42 
Bibliography ... 54 
Textiles - Tests for color fastness - Color fastness to
artificial light: Xenon arc
1 Scope
This Standard specifies a method intended for determining the effect on the
color fastness of textiles of all kinds and in all forms to the action of an artificial
light source representative of natural daylight (D65).
This Standard is applicable to colored textiles; is also applicable to white
(bleached or optically brightened) textiles.
Note: This Standard allows the use of two different sets of blue wool references. The
results may not be identical.
2 Normative references
The following documents are indispensable for the application of this document.
For the dated references, only the editions with the dates indicated are
applicable to this document. For the undated references, the latest edition
(including all the amendments) are applicable to this document.
GB/T 250 Textiles - Tests for colour fastness - Grey scale for assessing
change in colour (GB/T 250-2008, ISO 105-A02:1993, IDT)
GB/T 730 Textiles - Tests for colour fastness - Quality control of Blue wool
reference materials 1 to 7 (GB/T 730-2008, ISO 105-B08:1995, MOD)
GB/T 6151 Textiles - Tests for colour fastness - General principles of testing
(GB/T 6151-2016, ISO 105-A01:2010, MOD)
GB/T 6682 Water for analytical laboratory use - Specification and test
methods (GB/T 6682-2008, ISO 3696:1987, MOD)
GB/T 8431 Textiles - Tests for colour fastness - Detection and assessment
of photochromism (GB/T 8431-1998, eqv ISO 105-B05:1994)
GB/T 32616 Textiles - Tests for colour fastness - Instrumental assessment of
change in colour for determination of grey scale rating (GB/T 32616-2016,
ISO 105-A05:1996, MOD)
FZ/T 01047 Standard light sources and conditions for visual assessment of
Data in Annex B are presented to illustrate the relationship of each of the blue
wool references on exposure to fixed amounts of radiant energy.
5.1.4 Humidity-test control
The effective humidity can only be measured by determining the color fastness
to light of a specific humidity-test control fabric (see 3.7).
5.2 Apparatus
5.2.1 Light source
5.2.1.1 The exposure device shall provide for placement of specimens and any
sensing devices in positions that allow uniform irradiance from the light source.
The spectral irradiance produced in an artificial accelerated light and
weathering device is very important. Ideally, the relative spectral irradiance
produced by the device should be a very close match to that of solar radiation,
especially in the short wavelength UV region. Annex C provides information
about important benchmark solar spectra that can be used for comparing the
spectral irradiance produced in the artificial accelerated exposure to that for
solar radiation.
5.2.1.2 Exposure devices shall be designed such that the variation in irradiance
at any location in the area used for specimen exposure shall not exceed ± 10 %
of the mean. Procedures for measuring irradiance uniformity are found in Annex
D.
Note: The irradiance uniformity in exposure devices depends on several factors. The
configuration of the xenon arc lamp with respect to the specimens on exposure,
including the differences in distance between the lamp(s) and the samples can affect
uniformity of exposure. Deposits which can develop on the optical system and
chamber walls, and the type and number of specimens being exposed, can also
have an effect on uniformity of exposure.
5.2.1.3 Periodic repositioning of the test specimens in the test chamber is
recommended to ensure the most consistent results.
5.2.1.4 Follow the apparatus manufacturer’s instructions for lamp and filter
replacement.
Direct radiation from xenon burners contains considerable amounts of short-
wavelength ultraviolet radiation not present in daylight. Optical filters shall be
fitted to minimize short-wavelength light (less than 310 nm) in accordance with
the requirements in Annex C. The xenon arc, when appropriately filtered,
produces radiation with a spectral power distribution that is a good simulation
5.2.3 Humidity
The presence of moisture can have a significant effect in accelerated laboratory
exposure tests. The apparatus shall have the means for providing and
controlling moisture to specimens by humidification of the chamber air. The
quality of the water used to create the effective humidity shall be a minimum of
Grade 3 in accordance with GB/T 6682.
5.2.4 Covers
Covers shall be made from thin opaque material, for example high-grade steel,
thin sheet aluminium or cardboard covered with aluminium foil, for partial
covering of samples and blue wool references. The opaque material shall
neither react with the test specimens nor the test conditions and shall not itself
produce any change in color of either the test specimen or the reference
materials.
5.2.5 Assessment light source
It shall meet the requirements of FZ/T 01047.
5.2.6 Assessment cabinet
It shall meet the requirements of GB/T 6151.
5.2.7 White card stock
It shall not contain fluorescent brightening agent.
5.2.8 Assessment mask
It shall meet the requirements of GB/T 6151. In order to obtain reliable test
results, the test specimen(s) shall be masked with a material that is identical in
color to the sleeve that is used to mask the grey scale (5.2.9).
5.2.9 Grey scale for assessing change in color
It shall meet the requirements of GB/T 250.
6 Preparation of test specimens
6.1 The size of the test specimen will depend on the number of specimens to
be tested and on the shape and dimensions of the specimen holders supplied
with the apparatus. Attention is drawn to the guidelines given in E.4.
6.2 The specimen may be a strip of cloth, yarn wound close together on a white
reference as referenced in Table 2. The contrast should be equal to that
specified for the appropriate exposure conditions (see Table 2).
8.2.7 If ...