GB/T 35256-2017 English PDF (GBT35256-2017)

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GB/T 35256-2017: Textiles -- Tests for colour fastness -- Artificial weathering -- Exposure to filtered xenon-arc radiation
GB/T 35256-2017
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.080.01
W 04
Textiles - Tests for colour fastness - Artificial weathering -
Exposure to filtered xenon-arc radiation
(ISO 105-B10:2011, MOD)
ISSUED ON: DECEMBER 29, 2017
IMPLEMENTED ON: JULY 01, 2018
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions... 6 
4 Principle ... 7 
5 Apparatus and materials ... 7 
6 Test specimens ... 13 
7 Exposure conditions ... 14 
8 Procedure ... 15 
9 Assessment ... 17 
10 Test report ... 17 
Appendix A (Informative) Typical applications and exposure durations ... 19 
References ... 20 
Textiles - Tests for colour fastness - Artificial weathering -
Exposure to filtered xenon-arc radiation
1 Scope
This Standard specifies a procedure for exposing textiles to artificial weathering in
filtered xenon-arc apparatus (including the action of liquid water and water vapour) in
order to determine the weather resistance of the colour of textiles. The filtered xenon-
arc light source in the test chamber simulates the solar spectral irradiance specified in
Table 4 of CIE 85:1989.
This Standard applies to the testing of textiles for either their weather fastness or aging
resistance; it also applies to white (bleached or optically brightened) textiles.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
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 6151-2016, Textiles - Tests for colour fastness - General principle of testing
(ISO 105-A01:2010, MOD)
GB/T 6529, Textiles - Standard atmospheres for conditioning and testing (GB/T
6529-2008, ISO 139:2005, MOD)
GB/T 16422.1, Plastics - Methods of exposure to laboratory light sources - Part 1:
General guidance (GB/T 16422.1-2006, ISO 4892-1:1999, IDT)
GB/T 32616, Textiles - Tests for colour fastness - instrumental assessment of change
in color for determination of grey scale rating (GB/T 32616-2016, ISO 105-
A05:1996, MOD)
CIE 15, Colorimetry (Third edition)
CIE 51.2, A method for assessing the quality of daylight simulators for colorimetry
CIE 85:1989, Solar spectral irradiance
be comparable. Both two types of thermometers shall meet the requirements of GB/T
16422.1. Generally, BST and BPT do not give the same readings.
In weathering devices where specimens are positioned in a flat plane in front of a light
source, a black-standard thermometer shall be used.
Note 1: The BST differs from the BPT because the black plate of the BST is fixed on a
thermally insulated mounting. The temperatures measured therefore
correspond approximately to those measured on the exposed surface of the test
specimen with a black or dark-coloured coating on a substrate of low thermal
conductivity. The surface temperatures of light-coloured test panels will
usually be lower.
Note 2: The surface temperature of a test specimen depends on a number of factors,
including the amount of radiation absorbed, the amount of radiation emitted,
thermal-conduction effects with the test specimen and heat transfer between
the test specimen and the air, and between the test specimen and the specimen
holder, and cannot therefore be predicted with accuracy.
Note 3: In a typical exposure environment (no high irradiance), the BST temperature is
usually about 2 °C ~ 5 °C higher than the BPT temperature.
Note 4: The black-standard thermometer is also called insulated black-panel
thermometer. The black-panel thermometer is also called uninsulated black-
panel thermometer.
5.4.2.1 Black-standard thermometer (BST)
The black-standard thermometer for measuring the black-standard temperature in the
plane of the test specimens during the dry period shall consist of a plane stainless-steel
plate with a thickness of about 0.5 mm ~ 1.0 mm. The typical length and width is about
70 mm × 40 mm; the surface of the plate facing the light source shall be coated with a
black layer that has good resistance to ageing. The coated plate shall absorb at least 90%
of all incident flux up to 2 500 nm. A platinum resistance sensor shall be attached in
good thermal contact to the centre of the plate on the side opposite the radiation source.
The side of the stainless-steel panel on the side opposite the radiation source shall be
attached to a 5 mm thick base-plate, which is made of unfilled polyvinylidene difluoride
(PVDF). There is a small recess that is sufficient to hold the platinum resistance sensor
in the PVDF base-plate. The distance between the recess in the PVDF base-plate and
the sensor shall be about 1 mm. The length and the width of the PVDF plate shall be
sufficiently large to ensure that no metal-to-metal thermal contact exists between the
black-coated metal plate of the black-standard thermometer and the mounting holder
into which it is fitted. The metal mounts of the holder of the insulated black panel shall
be at least 4 mm from the edges of the metal plate. As long as the exposure equipment
can reach the set stable temperature and irradiance conditions, and the indicated
temperature of the selected thermometer of other structures is within ±1°C of the
not contaminate the water employed. In case of immersion, the BST or BPT sensor shall
also be completely immersed.
The conductivity of the spray water shall be less than 5 μS/cm; the insoluble content
shall be less than 1 μg/g; no visible stains or deposits shall be left on the surface of the
specimens. The silicon content shall be kept below 0.2 μg/g. A combination of
deionization and reverse osmosis can be used to produce water of the desired quality.
Note: Wetting of the samples by water spray or by immersion does not necessarily lead
to similar results.
5.6 Specimen holders
Specimen holders shall be made of inert materials that will not affect the test results.
The specimen holders are preferably made in the form of an open frame. If required, a
metal plate can be used to close the specimen holder from the rear.
Additional devices may be used to mount different types of specimens. An open inner
metal frame, which can take up thin textile specimens sewn to a ring, can be used inside
the main frame. Otherwise, inert materials, such as metal or specifically neutral plastic
sheets, can be used to mount specimens. White cardboard without an optical brightener
can be used when applying exposure conditions without water spray.
Opaque covers, made from inert materials (such as thin sheets of aluminum or plastic)
may be used to partly cover a portion of the specimens. White cardboard without an
optical brightener can be used when applying exposure conditions without water spray.
Places not used for specimens shall be filled with dummy specimens, such as neutral
plastic plates or stainless-steel plates, in order to obtain uniform exposure conditions.
Details on specimen holders and mounting of the specimens shall be included in the
test report.
5.7 Spectrophotometer
The spectrophotometer for colorimetric measurement of colour difference shall ...