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

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.

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.

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

3 Terms and Definitions

For the purposes of this Document, the terms and definitions given in ISO 4892-1 apply.

4 Principles

It is recommended that a similar material of known performance (a control) be exposed

simultaneously with the test specimens to provide a standard for comparative purposes.

Intercomparison of results obtained from specimens exposed in different apparatus should

not be made unless an appropriate statistical relationship has been established between the

apparatuses for the particular material exposed.

5 Apparatus

Filters are used to filter xenon-arc emissions in order to simulate daylight (CIE Publication No.

85.1989, Table 4). The minimum and maximum levels of the relative spectral irradiance in the

UV wavelength range are given in Table 1 (see also Annex A).

The irradiance at any position in the area used for specimen exposure shall be at least 80 % of

the maximum irradiance. Requirements for periodic repositioning of specimens when this

requirement is not met are described in ISO 4892-1.

6 Test Specimens

Make reference to ISO 4892-1.

7 Exposure Conditions

8 Procedure

Before placing the specimens in the test chamber, be sure that the apparatus is operating under

the desired conditions (see Clause 7). Programme the apparatus with the selected conditions to

operate continuously for the required number of cycles at the selected exposure conditions.

Maintain these conditions throughout the exposure, keeping any interruptions to service the

apparatus and to inspect the specimens to a minimum.

9 Exposure Report

Make reference to ISO 4892-1.

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