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GB/T 16422.2-2022 English PDF (GBT16422.2-2022)

GB/T 16422.2-2022 English PDF (GBT16422.2-2022)

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GB/T 16422.2-2022: Plastics -- Methods of exposure to laboratory light sources -- Part 2: Xenon-arc lamps

GB/T 16422.2-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.080.01
CCS G 31
GB/T 16422.2-2022 / ISO 4892-2:2013
Replacing GB/T 16422.2-2014
Plastics – Methods of Exposure to Laboratory Light Sources
– Part 2: Xenon-Arc Lamps
(ISO 4892-2:2013, IDT)
ISSUED ON: APRIL 15, 2022
IMPLEMENTED ON: NOVEMBER 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
Introduction ... 5
1 Scope ... 6
2 Normative References ... 6
3 Terms and Definitions ... 7
4 Principles ... 7
5 Apparatus ... 8
5.1 Laboratory light source ... 8
5.2 Test chamber ... 10
5.3 Radiometer ... 11
5.4 Black-standard/black-panel thermometer ... 11
5.5 Wetting and humidity-control equipment ... 11
5.6 Specimen holders ... 12
5.7 Apparatus to assess changes in properties ... 12
6 Test Specimens ... 12
7 Exposure Conditions ... 12
7.1 Radiation ... 12
7.2 Temperature ... 12
7.3 Relative humidity of chamber air ... 13
7.4 Spray cycle ... 14
7.5 Cycles with dark periods ... 14
7.6 Sets of exposure conditions ... 15
8 Procedure ... 16
8.1 General ... 16
8.2 Mounting the test specimens ... 16
8.3 Exposure ... 16
8.4 Measurement of radiant exposure ... 16
8.5 Determination of changes in properties after exposure ... 17
9 Exposure Report ... 17
Annex A (Informative) Filtered Xenon-Arc Radiation - Relative Spectral Irradiance 18 Annex B (Normative) Additional Exposure Cycles ... 20
Annex C (Informative) Classification of Daylight Filter ... 22
Bibliography ... 25
Foreword
This document was drafted as per the rules specified in GB/T 1.1-2020 Directives for Standardization – Part 1: Rules for the Structure and Drafting of Standardizing Documents. This Document is Part 2 of GB/T 16422 Plastics – Methods of Exposure to Laboratory Light Sources. GB/T 16422 has published the following parts:
--- Part 1: General Guidance;
--- Part 2: Xenon-Arc Sources;
--- Part 3: Fluorescent UV Lamps;
--- Part 4: Open Flame Carbon Arc Lamp.
This Document replaced GB/T 16422.2-2014 Plastics – Methods of Exposure to Laboratory Light Sources – Part 2: Xenon-Arc Sources. Compared with GB/T 16422.2-2014, the major technical changes of this Document are as follows besides the structural adjustments and editorial modifications:
a) Add the statement about spectral irradiance "2nm incremental measurement" in footnote a of "Table 1" and footnote a of "Table 2" (see Tables 1 and 2 of this Edition); b) Add suggestions for measuring the maximum surface temperature device (see 5.4 of this Edition);
c) Change the exposure cycle in Table 3; only retain the original three exposure cycles; delete two exposure cycles with a black standard temperature of (100±3) °C in Method A (see Table 3 of this Edition; Table 3 of 2014 Edition); and adjust the other three exposure cycles that do not control the temperature and relative humidity of the test chamber to Table B.1 (see Table B.1 of this Edition; Table 3 of 2014 Edition); d) Change the exposure cycle in Table 4; only retain the original three exposure cycles; delete the two exposure cycles with black panel temperature of (89±3) °C in Method A (see Table 4 of this Edition; Table 4 of 2014 Edition); and adjust the other three exposure cycles that do not control the temperature and relative humidity of the test chamber and add the exposure cycles of the two Methods A to Table B.2 (see Table B.2 of this Edition; Table 4 of 2014 Edition);
e) Change the provisions on the setting of exposure conditions; and point out that there is no correlation between the black standard temperature and the black panel temperature and the conditions for the use of the black standard thermometer instead of the black panel thermometer (see 7.6 of this Edition; 6.6 of 2014 Edition);
f) Add the Annex "More Exposure Cycles" (see Annex B of this Edition).
This Document equivalently adopts ISO 4892-2:2013 Plastics – Methods of Exposure to Laboratory Light Sources – Part 2: Xenon-Arc Lamps.
This Document adds a Clause of “Terms and Definitions”.
This Document made the minimum editorial modifications:
--- Incorporate the amendments of ISO 4892-2:2013/Amd.1:2021, and the outer margins of the terms involved are marked with vertical double lines (‖).
Please note some contents of this Document may involve patents. The issuing agency of this Document shall not assume the responsibility to identify these patents. This Document was proposed by China Petroleum and Chemical Industry Federation. This Document shall be under the jurisdiction of National Technical Committee on Plastics of Standardization Administration of China (SAC/TC 15).
Drafting organizations of this Document: Guangzhou Synthetic Materials Research Institute Co., Ltd.; Shaanxi Yanchang Jingwei New Material Technology Industrial Park Co., Ltd.; Shandong Dawn Polymer Co., Ltd.; Orinko Advanced Plastics Co., Ltd.; Beijing Tiangang Auxiliary Co., Ltd.; Wanhua Chemical Group Co., Ltd.; Suzhou EMTEK Co., Ltd.; Atlas Material Testing Technology LLC.; Qingdao Hengjia Precision Technology Co., Ltd.; SAIC- GM-Wuling Automobile; Shenzhen NTEK Testing Technology Co., Ltd.; Suzhou Sunway Polymer Co., Ltd.; and Q-Lab Corporation Shanghai Office.
Chief drafting staffs of this Document: Wang Haojiang, Tie Wenan, Zhao Lei, Wang Fei, Wang Chanyao, Liu Gang, Yang Li, Xie Xiao, Cheng Ge, Lu Bo, Lan Xian, Zhou Yebi, Wang Haili, Zhang Heng, Tian Xiaoyan, Chen Guoyang, and Chen Xin.
The historical editions replaced by this Standard are as follows:
--- It is first-time published as GB/T 9344-1988 in 1988;
--- It is first-time revised as partial publication in 1999; this Document corresponds to GB/T 16422.2-1999; it is second-time revised in 2014;
--- It is third-time revised hereby.
Plastics – Methods of Exposure to Laboratory Light Sources
– Part 2: Xenon-Arc Lamps
1 Scope
This Document specifies the test method for the exposure of specimens in the test equipment equipped with xenon arc lamp, heat and humidity. The test equipment simulates the actual use environment of total solar radiation or solar radiation through window glass, so that the material produces effects similar to natural aging.
This Document is applicable to laboratory artificial accelerated weathering tests of plastic specimens exposed to filtered xenon arc lamps under controlled environmental conditions (temperature, humidity and/or wetting). Different test requirements can be met by combining different types of xenon arc lamps and filters.
Specimen preparation and result evaluation for specific materials refer to other standards. ISO 4892-1 gives the general guidance of this Document.
NOTE: Refer to GB/T1865-2009 for the xenon arc lamp exposure test method for paints and varnishes. 2 Normative References
The provisions in following documents become the essential provisions of this Document through reference in 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) is applicable to this Document.
ISO 4582 Plastics – Determination of Changes in Color and Variation in Properties after Exposure to Glass-Filtered Solar Radiation, Natural Weathering or Laboratory Radiation Sources
NOTE: GB/T 15596-2021 Plastics – Determination of Changes in Color and Variation in Properties after Exposure to Glass-Filtered Solar Radiation, Natural Weathering or Laboratory Radiation Sources (ISO 4582:2017, IDT)
ISO 4892-1 Plastics – Methods of Exposure to Laboratory Light Sources – Part 1: General Guidance
NOTE: GB/T 16422.1-2019 Plastics – Methods of Exposure to Laboratory Light Sources – Part 1: Therefore, test results obtained with the two tables might not be comparable. NOTE 1: If a black-panel thermometer is used, the temperature indicated will be 3 °C ~ 12 °C lower than that indicated by a black-standard thermometer under typical exposure conditions. If a black-panel thermometer is used, then the panel material, the type of temperature sensor and the way in which the sensor is mounted on the panel shall be included in the exposure report.
NOTE 2: If higher temperatures are used as specified in Table 3 and Table 4 for special exposures, the tendency for specimens to undergo thermal degradation will increase and this might affect the results of such exposures.
Other temperatures may be used when agreed on by the interested parties, but shall be stated in the exposure report.
If water spray is used, the temperature requirements apply to the end of the dry period. If the thermometer does not reach a steady state during the dry period after the short water-spray part of the cycle, check whether the specified temperature is reached during a longer dry period, and consider using this longer dry period.
NOTE 3: During the water-spray part of the cycle, the black-standard or black-panel temperature will be close to that of the water used.
NOTE 4: The additional measurement of a white-standard/white-panel temperature with a white- standard/white-panel thermometer in accordance with ISO 4892-1 gives important information on the range of surface temperatures of differently colored test specimens.
7.2.2 Chamber air temperature
Exposures can be run either with the chamber air temperature controlled at a specified level (see Table 3 and Table 4) or allowing the air temperature to find its own level (see Table B.1 and Table B.2).
NOTE: The possible specimen surface temperature has as its lower limit the temperature of the air surrounding the specimens (i.e., the chamber temperature) and as its upper limit the black-standard temperature specified. It is assumed that the actual specimen temperature lies somewhere between these two limits.
7.3 Relative humidity of chamber air
Exposures can be conducted either with the relative humidity controlled at a specified level (see Table 3 and Table 4) or allowing the relative humidity to find its own level (see Table B.1 and Table B.2).

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