QB/T 2727-2017 English PDF (QBT2727-2017)

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QB/T 2727-2017: Leather -- Tests for color fastness -- Color fastness to artificial light: Xenon art fading lamp test
QB/T 2727-2017
LIGHT INDUSTRY STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 59.140.30
Classification No.. Y 46
File No.. 57072-2017
QB/T 2727-2005
Replacing QB/T 2727-2005
Leather - Tests for color fastness - Color fastness to
artificial light. xenon art fading lamp test
ISSUED ON. JANUARY 09, 2017
IMPLEMENTED ON. JULY 01, 2017
Issued by. Ministry of Industry and Information Technology of the
People's Republic of China
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Principle... 4
4 Reference materials and equipment... 4
5 Sample... 6
6 Exposure conditions... 7
7 Operating procedures... 7
8 Exposure methods... 7
9 Evaluation of color fastness to light... 10
10 Test report... 11
Leather - Tests for color fastness - Color fastness to
artificial light. xenon art fading lamp test
1 Scope
This Standard specifies the test methods for the color of leather to resist
artificial light sources and heat.
This Standard applies to all kinds of leather that require light resistance and
high temperature resistance.
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 730 Textiles - Tests for colour fastness - Quality control of blue wool
reference materials 1 to 7
GB/T 6682 Water for analytical laboratory use - Specification and test
methods
GB/T 8432 Humidity test control for colour fastness to light
3 Principle
Under artificial light sources, expose the sample with blue wool reference
materials according to the specified conditions. After the sample is exposed to
the specified requirements, compare the sample with the blue wool reference
materials used or grey scale to evaluate the color fastness to light discoloration.
4 Reference materials and equipment
4.1 Reference materials
4.2.1.2 Water-cooled xenon arc lamp light resistance testing machine
Water-cooled xenon arc lamp light resistance testing machine shall meet the
following conditions.
a) Light filter. It includes inner and outer light filter glass to contain and guide
the flow of cooling water. The filter is placed between the light source AND
the sample and the blue wool reference materials, so that the ultraviolet
spectrum and part of the infrared spectrum are steadily attenuated. Its
transmittance is at least 90 % at 380 nm ~ 750 nm, and it drops to 0 at
around 310 nm; or it is equipped with quartz inner filter and S-type silicon
bromine outer filter;
b) It can automatically control the temperature and relative temperature;
c) Cooling system. 3-level water circulation (complying with GB/T 6682)
passes between the inner and outer light filter glass of the xenon lamp
and it cools by a heat exchange device.
4.2.2 Temperature sensor
4.2.2.1 Black plate thermometer (BPT), including a metal plate with a size of at
least 45 mm × 100 mm. The temperature is measured by a temperature
measuring device, and the thermal measurement point is located in the center
of the metal plate. The side of the metal plate facing the light source is black,
so that the reflectivity of the light reaching the sample on the blackboard is less
than 5 %.
4.2.2.2 Black scale thermometer (BST), including a stainless steel plate with a
size of about 70 mm × 30 mm, a thickness of about 0.5 mm. The temperature
is measured by a temperature measuring device. The metal plate is fixed with
a material plate for thermal insulation and is coated with a black coating, so at
least 95 % absorption can be obtained even in the infrared spectral range.
4.2.2.3 Irradiance monitor. Since the irradiance of the sample surface changes
as a function of the xenon lamp, light intensity and the distance from the xenon
lamp to the sample, the consistency of exposure shall be controlled by the
irradiance monitor.
5 Sample
5.1 The size of the sample shall meet the size of the sample holder that comes
with the instrument. The size of the sample varies with the number of samples
and the size and shape of the sample holder provided by the instrument. One
sample holder can be used to test one sample or a set of samples.
evaluated against the blue wool reference materials.
8.1 Method 1
The basic feature of this method is to control the exposure cycle by checking
the sample, so each sample needs to be equipped with a set of blue wool
reference materials.
8.1.1 ARRANGE the sample and the blue wool reference materials in parallel,
and PLACE the covering on the sample and the blue wool reference materials.
The covering shall make the exposed part no less than 1/3 of the width of the
sample holder and no more than 1/2 of the width of the sample holder.
8.1.2 EXPOSE under the xenon lamp according to the exposure conditions.
8.1.3 LIFT the covering from time to time, CHECK the lighting effect of the
sample, until the color difference between the exposed and unexposed parts of
the sample reaches the grey scale level 4, and EVALUATE the color fastness
to light of the sample initially.
8.1.4 COVER the sample and the blue wool reference materials with another
covering, continue to EXPOSE until the color difference between the exposed
and unexposed parts of the sample is equal to the grey scale level 3, and
EVALUATE the color fastness to light at this time. The covering shall completely
cover the covering in 8.1.1, at the same time it shall make the second-stage
exposure about 1/2 of the exposure width in 8.1.1.When the fade of the blue
wool reference material 7 reaches the grey scale level 4 first, the exposure can
be terminated.
8.2 Method 2
This method is suitable for testing a large number of samples at the same time.
Its basic feature is to control the exposure cycle by checking the blue wool
reference materials. It only requires a set of blue wool reference materials to
test a batch of samples with different color fastness to light, to save blue wool
reference materials.
8.2.1 ARRANGE the sample and blue wool reference materials in parallel.
8.2.2 COVER 1/5 ~ 1/4 of the total length of the sample and the blue wool
reference materials with covering.
8.2.3 EXPOSE according to the exposure conditions, and LIFT the covering
from time to time to check the lighting effect of the blue wool reference materials.
8.2.4 When it can be observed that the color change of the blue wool reference
material 2 reaches the grey scale level 3, the color fastness to light of the
This method is suitable for checking whether it meets the approved irradiation
energy value. The sample can be exposed alone or together with the blue wool
reference materials until the specified irradiation amount is reached.
9 Evaluation of color fastness to light
9.1 On the basis that the color difference between the exposed and unexposed
parts of the sample is equal to the grey scale level 3, the final evaluation of the
level of color fastness to light is made. On the basis that the color difference
between the exposed and unexposed parts of the white leather reaches the
grey scale level 4, the final evaluation of the level of color fastness to light is
made.
9.2 REMOVE all coverings, the sample and the blue wool reference materials...