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GB/T 31881-2015: Accelerated weathering test methods of automotive nonmetal components and materials using a fluorescent UV and condensation apparatus
GB/T 31881-2015
GB
National Standard
of the People’s Republic of China
ICS 43.020
T 40
Accelerated weathering test methods of automotive
nonmetal components and materials using a
fluorescent UV and condensation apparatus
ISSUED ON. SEPTEMBER 11, 2015
IMPLEMENTED ON. DECEMBER 01, 2015
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 4 
4 Test equipment ... 6 
5 Test sample ... 8 
6 Test conditions and test methods ... 9 
7 Test procedure ... 9 
8 Test results and evaluation ... 10 
9 Test report ... 10 
Appendix A ... 12 
Foreword
This Standard is drafted in accordance with the rules in GB/T 1.1-2009.
This Standard was proposed by the Ministry of Industry and Information
Technology of the People's Republic of China.
This Standard shall be under the jurisdiction of National Automotive
Standardization Technical Committee (SAC/TC 114).
Chief drafting organizations of this Standard. National Automobile Quality
Supervision and Inspection Center (Xiangyang), Dongfeng Motor Corporation
Technical Center, China FAW Group Corporation R and D Center, FAW -
Volkswagen Automotive Co., Ltd., Dongfeng Peugeot Citroen Automobile Co.,
Ltd., Fifty-nine Institute of China North Industries, National Polymer Materials and
Products Quality Supervision and Inspection Center, Shenzhen BYD
Automobile Co., Ltd., Zhejiang Juner New Material Co., Ltd., DuPont
Performance Coatings (Shanghai) Co., Ltd., Hainan Tropical Automobile Test
Co., Ltd., CSTC Standards Technical Services (Shanghai) Co., Ltd., Chery
Automobile Co., Ltd., Kingfa Technology Co., Ltd., Nanjing Automobile Group
Co., Ltd., Anhui Jianghuai Automobile Co., Ltd., SAIC Motor Corporation
Limited Passenger Car Division, Changan Automobile Company Limited
Automotive Engineering Research Institute.
Main drafters of this Standard. Liu Lizhi, Zhang Heng, Sun Xinglei, Li Jinghua,
Wang Naxin, Yu Huijie, Liu Boping, Peng Biaobin, Tian Yue’e, Xiong Zhimin,
Wang Hao, Zheng Zhenwu, Ning Binhua, Zhou Yibing, Chen Liping, Yang
Fengfu, Jiang Wenqun, Chen Haiyan, Li Xiaoyin, Li Weidong, Chen Zheng, Li
Zhangyin, Chen Guangqiang, Zhu Chunjin, Chen Liangxiao, Yang Rusong,
Huang Xu, Zhao Lihua.
Accelerated weathering test methods of automotive
nonmetal components and materials using a
fluorescent UV and condensation apparatus
1 Scope
This Standard specifies the test methods and evaluation methods to use UV
aging test equipment to conduct accelerated aging against automotive non-
metallic parts and materials.
This Standard applies to automotive plastics, rubber, coatings, adhesives, and
other non-metallic parts and materials.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this document.
GB/T 250-2008 Textiles - Tests for color fastness - Grey scale for assessing
change in color
GB/T 1766-2008 Paints and varnishes - Rating schemes of degradation of
coats
GB/T 15596-2009 Plastics - Determination of changes in color and
variations in properties after exposure to daylight under glass, natural
weathering or laboratory light sources
GB/T 16422.3 Plastics - Methods of exposure to laboratory light sources -
Part 3. Fluorescent UV lamps
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
sensor and the sample in the same environment.
During exposure to UV irradiation, by supplying hot air to the chamber,
MAINTAIN the sample surface temperature within ±3°C of the set temperature.
During the condensation exposure, by heating the water in the water tray,
MAINTAIN the sample surface temperature within ±3°C of the set temperature.
The temperature control of UV irradiation and condensation cycle shall be
independent of each other.
5 Test sample
5.1 The sample size shall be 50mm×75mm, 75mm×100mm, 75mm×150mm,
100mm×150mm, or as agreed between the test parties.
5.2 Before the test, the test sample shall be cleaned. AND it shall not use the
cleaning agent which may erode sample surface. It is not allowed to wash away
the intentionally applied protective film from the sample surface.
5.3 If the sample is cut from a large work piece, the test can be agreed by the
test parties, BUT it shall ensure that the test part of the sample complies with
the test requirements.
5.4 It shall take at least two samples, wherein one sample is used as file sample
for evaluation and comparison, which is stored in a dark, dry environment.
Unless otherwise agreed by the test parties, the file sample is generally not
covered by half.
5.5 To provide the aging record of different time intervals, it is needed to provide
sufficient number of samples.
5.6 As for the insulating material sample, such as plastic or foam, it shall control
the sample thickness, so as to ensure the heat transfer to make the sample
surface form condensation.
5.7 As for soft sample, it shall fix it on an inert metal back plate.
5.8 In order to prevent the loss of water vapor during test, as for the samples
which have 2mm-above holes OR 1mm-above gaps with sample holder due to
shape inconsistency, it is needed to seal the hole and gap of sample. As for the
porous samples, such as fabric, it shall use water vapor barrier materials, such
as metal materials, as backing.
7.4 When the condensation cycle starts, BEGIN exposure test. In order to
ensure the condensing effect during the condensation cycle, CHECK whether
the sample surface is with condensation once a week.
7.5 In order to reduce the effects caused by the changes of temperature and
UV irradiation, it shall periodically rotate the sample position. Horizontally move
the sample at least once a week.
8 Test results and evaluation
When the test is finished, it shall evaluate the color change, gloss change,
chalking, cracking, blistering, and peeling of the test sample.
As for the visual color change of the sample, refer to GB/T 250-2008. As for the
gloss change of the sample, the instrument measured color change, chalking,
cracking, blistering, rusting, peeling, mildew, etc., refer to GB/T 1766-2008 and
GB/T 15596-2009.
9 Test report
The test report shall include the following.
a) Description of the test sample;
b) Indicated number of this Standard;
c) Selected test method (test method 1, test method 2);
d) Test results (given in Chapter 8);
e) Used UV aging equipment model and serial number;
f) Fluorescent UV lamp supplier name, lamp name specified by the
manufacturer, lot number or date code, AND wavelength corresponding to
irradiance peak;
g) UV irradiation cycle time and temperature, condensation cycle time and
temperature;
h) Time of aging test;
i) Whether the test is conducted in stages;
j) Any differences from specified test methods;
Appendix A
(Normative)
Test equipment maintenance and calibration
A.1 Maintenance and calibration
The test equipment shall be subject to regular maintenance, so as to ensure
the uniformity of exposure. In accordance with the equipment instructions,
CONDUCT necessary maintenance and calibration.
A.2 Irradiance calibration
A.2.1 The equipment shall be able to continuously monitor UV irradiance, AND
automatically adjust the power of UV lamp, so as to maintain the irradiance set
point.
A.2.2 When the lamp works for every 400h±25h OR when replacing a new lamp,
in accordance with the equipment requirements, USE irradiance calibrator to
conduct irradiance output calibration.
A.2.3 When it is not able to maintain the set irradiance, REPLACE all the lamps
in the equipment.
A.3 Thermometer calibration
The black panel thermometer shall be calibrated once every six months.
PLACE simultaneously the equipment’s working thermometer and the
calibration thermometer into thermos which is filled with hot water. As for the
hot water temperature, refer to the maximum temperature of the running device.
It is needed for 10min settling time to calibrate the thermometer reading, so as
to correct the working thermometer.
A.4 Water tray maintenance
Every six months, DRAIN the water and clean water tray, AND it is also allowed
to clean it more frequently based on local water quality. AVOID the surface float
or underwater fouling from impacting water evaporation.
GB/T 31881-2015
GB
National Standard
of the People’s Republic of China
ICS 43.020
T 40
Accelerated weathering test methods of automotive
nonmetal components and materials using a
fluorescent UV and condensation apparatus
ISSUED ON. SEPTEMBER 11, 2015
IMPLEMENTED ON. DECEMBER 01, 2015
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 4 
4 Test equipment ... 6 
5 Test sample ... 8 
6 Test conditions and test methods ... 9 
7 Test procedure ... 9 
8 Test results and evaluation ... 10 
9 Test report ... 10 
Appendix A ... 12 
Foreword
This Standard is drafted in accordance with the rules in GB/T 1.1-2009.
This Standard was proposed by the Ministry of Industry and Information
Technology of the People's Republic of China.
This Standard shall be under the jurisdiction of National Automotive
Standardization Technical Committee (SAC/TC 114).
Chief drafting organizations of this Standard. National Automobile Quality
Supervision and Inspection Center (Xiangyang), Dongfeng Motor Corporation
Technical Center, China FAW Group Corporation R and D Center, FAW -
Volkswagen Automotive Co., Ltd., Dongfeng Peugeot Citroen Automobile Co.,
Ltd., Fifty-nine Institute of China North Industries, National Polymer Materials and
Products Quality Supervision and Inspection Center, Shenzhen BYD
Automobile Co., Ltd., Zhejiang Juner New Material Co., Ltd., DuPont
Performance Coatings (Shanghai) Co., Ltd., Hainan Tropical Automobile Test
Co., Ltd., CSTC Standards Technical Services (Shanghai) Co., Ltd., Chery
Automobile Co., Ltd., Kingfa Technology Co., Ltd., Nanjing Automobile Group
Co., Ltd., Anhui Jianghuai Automobile Co., Ltd., SAIC Motor Corporation
Limited Passenger Car Division, Changan Automobile Company Limited
Automotive Engineering Research Institute.
Main drafters of this Standard. Liu Lizhi, Zhang Heng, Sun Xinglei, Li Jinghua,
Wang Naxin, Yu Huijie, Liu Boping, Peng Biaobin, Tian Yue’e, Xiong Zhimin,
Wang Hao, Zheng Zhenwu, Ning Binhua, Zhou Yibing, Chen Liping, Yang
Fengfu, Jiang Wenqun, Chen Haiyan, Li Xiaoyin, Li Weidong, Chen Zheng, Li
Zhangyin, Chen Guangqiang, Zhu Chunjin, Chen Liangxiao, Yang Rusong,
Huang Xu, Zhao Lihua.
Accelerated weathering test methods of automotive
nonmetal components and materials using a
fluorescent UV and condensation apparatus
1 Scope
This Standard specifies the test methods and evaluation methods to use UV
aging test equipment to conduct accelerated aging against automotive non-
metallic parts and materials.
This Standard applies to automotive plastics, rubber, coatings, adhesives, and
other non-metallic parts and materials.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this document.
GB/T 250-2008 Textiles - Tests for color fastness - Grey scale for assessing
change in color
GB/T 1766-2008 Paints and varnishes - Rating schemes of degradation of
coats
GB/T 15596-2009 Plastics - Determination of changes in color and
variations in properties after exposure to daylight under glass, natural
weathering or laboratory light sources
GB/T 16422.3 Plastics - Methods of exposure to laboratory light sources -
Part 3. Fluorescent UV lamps
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
sensor and the sample in the same environment.
During exposure to UV irradiation, by supplying hot air to the chamber,
MAINTAIN the sample surface temperature within ±3°C of the set temperature.
During the condensation exposure, by heating the water in the water tray,
MAINTAIN the sample surface temperature within ±3°C of the set temperature.
The temperature control of UV irradiation and condensation cycle shall be
independent of each other.
5 Test sample
5.1 The sample size shall be 50mm×75mm, 75mm×100mm, 75mm×150mm,
100mm×150mm, or as agreed between the test parties.
5.2 Before the test, the test sample shall be cleaned. AND it shall not use the
cleaning agent which may erode sample surface. It is not allowed to wash away
the intentionally applied protective film from the sample surface.
5.3 If the sample is cut from a large work piece, the test can be agreed by the
test parties, BUT it shall ensure that the test part of the sample complies with
the test requirements.
5.4 It shall take at least two samples, wherein one sample is used as file sample
for evaluation and comparison, which is stored in a dark, dry environment.
Unless otherwise agreed by the test parties, the file sample is generally not
covered by half.
5.5 To provide the aging record of different time intervals, it is needed to provide
sufficient number of samples.
5.6 As for the insulating material sample, such as plastic or foam, it shall control
the sample thickness, so as to ensure the heat transfer to make the sample
surface form condensation.
5.7 As for soft sample, it shall fix it on...