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GB/T 2423.16-2022 PDF in English


GB/T 2423.16-2022 (GB/T2423.16-2022, GBT 2423.16-2022, GBT2423.16-2022)
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GB/T 2423.16-2022: PDF in English (GBT 2423.16-2022)

GB/T 2423.16-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 19.040
CCS K 04
GB/T 2423.16-2022 / IEC 60068-2-10:2018
Replacing GB/T 2423.16-2008
Environmental testing - Part 2: Test methods - Test J and
guidance: Mould growth
(IEC 60068-2-10:2018, Environmental testing - Part 2-10: Tests - Test J and
guidance: Mould growth, IDT)
ISSUED ON: JULY 11, 2022
IMPLEMENTED ON: FEBRUARY 01, 2023
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 ... 6
4 General description ... 6
5 Health hazards to operators ... 9
6 Description of the test variants ... 9
7 Reagents and materials ... 10
8 Requirements for test apparatus ... 13
9 Severities ... 14
10 Initial examinations ... 14
11 Pre-conditioning ... 14
12 Conditioning ... 14
13 Final examinations ... 17
14 Information to be given in the relevant specification ... 18
15 Information to be given in the test report as a minimum ... 19
Annex A (Informative) Danger to personnel ... 20
Annex B (Normative) Inoculation methods (see also 12.2) ... 22
Annex C (Informative) Recommended safety precautions ... 25
Annex D (Informative) Decontamination procedures ... 27
Annex E (Informative) Information on the test fungi ... 29
Annex F (Informative) Guidelines ... 31
Annex NA (Informative) Parts of the GB/T 2423 ... 39
Bibliography ... 43
Foreword
This document was drafted in accordance with the rules given in GB/T 1.1-2020,
Directives for standardization - Part 1: Rules for the structure and drafting of
standardizing documents.
This document is part 16 of GB/T 2423. For the issued parts of GB/T 2423, see Annex
NA.
This document replaces GB/T 2423.16-2008 Environmental testing - Part 2: Test
methods - Test J and guidance: Mold growth. Compared with GB/T 2423.16-2008, in
addition to structural adjustment and editorial changes, the main technical changes are
as follows:
a) Add the clause “Terms and definitions” (see Clause 3);
b) Change the content of “General description” of the test (see Clause 4, Clause 3 of
the 2008 edition);
c) Change “0.01 mol” to “0.01 mol/L” (see 7.3).
This document is identical to IEC 60068-2-10:2018 Environmental testing - Part 2-10:
Tests - Test J and guidance: Mould growth.
A clause “Terms and definitions” is added to this document.
The following minimal editorial changes are made to this document:
-- Change the name of the standard to Environmental testing - Part 2: Test methods
- Test J and guidance: Mould growth, to be consistent with existing standards;
-- Add the titles of Table 2, Table E.1 and Table E.2;
-- Add the footnote: 1) The original text of IEC is “0.01 molar”. Because the unit of
concentration – which should be mol/L – is incorrect in the 2008 edition, it is
herein corrected (see 7.3);
-- Add Appendix NA (informative) Parts of GB/T 2423;
-- Replace ISO/IEC 17025:1999 with the informative reference GB/T 27025-2019
(see notes to 4.1 and F.5);
-- Replace ISO 846:1997 with the informative reference ISO 846:2019 (see 4.1,
Table 1 and F.5).
Please note that some of the contents of this document may involve patents. The issuing
organization of this document is not responsible for identifying patents.
This document was proposed and managed by the National Technical Committee 8 on
Environmental Conditions of Electric and Electronic Products and Environmental Test
of Standardization Administration of China (SAC/TC 8).
Drafting organizations of this document: China National Electric Apparatus Research
Institute Co., Ltd., Guangdong Midea Consumer Electric Manufacturing Co., Ltd.,
Shenzhen Academy of Metrology & Quality Inspection, Guangdong Power Grid Co.,
Ltd. Guangzhou Power Supply Bureau Electric Power Test Research Institute, Nanjing
Wuhe Test Equipment Co., Ltd., Shenzhen Polytechnic, Tsinghua Shenzhen
International Graduate School, Chongqing ATEC Technology Co., Ltd., Aerospace
Science and Industry Defense Technology Research and Test Center, Shanghai
Electrical Apparatus Research Institute Group Company Limited, CCIC Southern
Testing Co., Ltd., The Fifth Institute of Electronics, Ministry of Industry and
Information Technology, Suzhou Electrical Apparatus Science Academy Co., Ltd.,
Electric Power Research Institute of Hainan Power Grid Co., Ltd., CenerTech Tianjin
Chemical Research and Design Institute Co., Ltd.
Main drafters of this document: Chen Chuan, Zhu Chen, Yu Jianhong, Sun Xueming,
Zhang Min, Zhang Dinghu, Yu Zhan, Wang Xilin, Zhang Jie, Zhang Wenchao, Guan
Zhaojie, Ma Ping, Jia Zhidong, Wang Chunhui, Hu Chun, Chen Lincong, Guo Zhijia,
Fang Jian, Zhang Shuangjun.
The previous versions of this document and the documents which are replaced by this
document are as follows:
-- First issued in 1990 as GB/T 2423.16-1990, first revised in 1999, second revised
in 2008;
-- This is the third revision.
Environmental testing - Part 2: Test methods - Test J and
guidance: Mould growth
1 Scope
This document provides a test method for determining the extent to which
electrotechnical products support mould growth and how any mould growth may affect
the performance and other relevant properties of the product.
Since mould growth conditions include high relative humidity, the test is applicable to
electrotechnical products intended for transportation, storage and use under humid
conditions over a period of some days at least.
2 Normative references
No normative references are required in this document.
3 Terms and definitions
No terms and definitions need to be defined in this document.
4 General description
4.1 Background
Under certain climatic and environmental conditions, micro-organisms may settle on
and colonize the surface of electrotechnical equipment. Their presence or their
metabolic products may not only damage the equipment itself, but may also affect the
equipment’s operability and serviceability. The actions of micro-organisms on
equipment are influenced by two different processes: direct action in which the
deterioration of material serve as a nutritive substance for the growth of the micro-
organisms and indirect action in which the metabolic products of the micro-organisms
generate deterioration.
The preferred method for controlling the effects of micro-organisms is by the selection
of materials that do not promote growth. Also acceptable is the treatment, or hermetic
sealing, of potentially vulnerable materials and components. Additionally, equipment
may not need to be evaluated if it is stored and/or operated throughout its entire life, in
conditions unlikely to encourage the growth of micro-organisms. Only if these cannot
13 Final examinations
13.1 Visual examination
The specimens shall be examined (see 13.3), checked and/or photographed (as required
by the relevant specification), immediately after they are removed from the container
or humidity chamber, because the growth can change its appearance by desiccation. See
Annex C, for recommended safety methods of handling.
Following a visual examination and assessment of the actual growth, the mycelium
shall be carefully removed with ethanol 70% vol from the surface which shall then be
examined through a microscope to assess the nature and extent of any attack (e. g.,
etching) on the specimen. See Annex C for recommended safety methods when
removing the mould growth.
13.2 Effect of growth
When the relevant specification calls for electrical and/or mechanical checks while
damp (following incubation), it is essential that the relative humidity of the
surroundings of the specimen(s) shall not be allowed to fall unduly until after such
checks have been made. The checks shall therefore be carried out on small specimens
while still exposed in the container with the lid fitted and free water. For large
specimens checks shall be made while they are still in the humidity chamber.
Note: When electrical connections have to be made or work has to be done on
specimens in containers or humidity chambers with the lids or doors necessarily
opened, this operation should be carried out with regard to the safety of
operators. See Annex C for recommended safety methods of handling.
Requirements of the manufacturer for operation under damp heat conditions
given in the operation manual will be observed.
Similar checks shall be made on the specimens inoculated with spore suspensions and
those inoculated with water only. Any significant difference between the two groups is
considered to be additional due to the presence of mould growth as well as the high
humidity.
Following the checks, the specimens shall be removed and visually examined as
prescribed in 13.1 and finally any attack on the specimen shall be determined.
If the relevant specification prescribes checks after recovery, the specimens shall be
removed from the container or chamber then visually examined as specified in 13.1 and
then exposed to the specified conditions for recovery for a period of 24 h at the
conclusion of which the checks shall be made.
12.3 Extent of growth
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.