GB/T 6739-2022 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 6739-2022 | English | 155 |
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Paints and varnishes - Determination of film hardness by pencil test
| Valid |
| GB/T 6739-2006 | English | 85 |
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Paints and varnishes -- Determination of film hardness by pencil test
| Obsolete |
| GB/T 6739-1996 | English | 279 |
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Determination of film hardness by pencil test
| Obsolete |
| GB 6739-1986 | English | 199 |
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2 days
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Method of test for film hardness by pencil test
| Obsolete |
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GB/T 6739-2022: Paints and varnishes - Determination of film hardness by pencil test---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT6739-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 87.040
CCS G 50
Replacing GB/T 6739-2006
Paints and Varnishes – Determination of Film Hardness by
Pencil Test
(ISO 15184.2020, MOD)
Issued on. DECEMBER 30, 2022
Implemented on. JULY 1, 2023
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 6
2 Normative References... 6
3 Terms and Definitions... 7
4 Principle... 7
5 Apparatus... 7
6 Sample... 9
7 Test Panel... 10
8 Operation Procedure... 10
9 Type of Defect... 11
10 Precision... 12
11 Test Report... 12
Appendix A (Informative) Technical Differences and Causes between this Document
and ISO 15184.2020... 13
Appendix B (Informative) Applicability of Pencil Hardness Test... 14
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 replaced GB/T 6739-2006 Paints and Varnishes - Determination of Film
Hardness by Pencil Test. Compared with GB/T 6739-2006, the major technical changes of this
Document are as follows besides the structural adjustments and editorial modifications.
a) Change the “Scope” (see Clause 1 of this Edition; Clause 1 of the 2006 Edition);
b) Change the "Normative References" (see Clause 2 of this Edition; Clause 2 of the 2006
Edition);
c) Delete the relevant content of "definition of defects" in the definition of the term pencil
hardness (see Clause 3 of the 2006 Edition);
d) Change the “Principle” (see Clause 4 of this Edition; Clause 4 of the 2006 Edition);
e) Delete “Required supplementary information” (see Clause 5 of the 2006 Edition);
f) Change the load exerted by the pencil port on the surface of the paint film (see 5.1of this
Edition; 6.1 of the 2006 Edition); known applicable pencil models and manufacturers
(see 5.2 of this Edition; 6.2 of the 2006 Edition); and add relevant contents that can also
use the pencil lead in the pen holder (movable/automatic pencil) (see 5.2 of this Edition);
g) Delete the relevant content that can also use the drawing eraser to clean the template (see
6.5 of the 2006 Edition);
h) Change the "Operating Procedures" (see Clause 8 of this Edition; Clause 9 of the 2006
Edition);
i) Add "Defect Type" (see Clause 9 of this Edition);
j) Change "Precision" (see Clause 10 of this Editon; Clause 10 of the 2006 Edition);
k) Change the "Test Report" (see Clause 11 of this Edition; Clause 11 of the 2006 Edition);
l) Change the content of "Required Supplementary Information" (see Appendix B of this
Edition; Appendix A of the 2006 Edition).
This Document modified and adopted ISO 15184.2020 Paints and Varnishes - Determination
of Film Hardness by Pencil Test.
Compared with ISO 15184.2020, this Document made the following structural adjustments.
--- Appendix B corresponded to Appendix A in ISO 15184.2020.
Compared with ISO 15184.2020, this Document has many technical differences, and the
involved clauses are marked with a vertical single line (|) in the outer margin of the page. A list
of these technical differences and their causes is provided in Appendix A.
This Document made the following editorial modifications.
--- Change the editorial error in Chapter 11 c) 1) of ISO 15184.2020.
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 Paints and
Pigments of Standardization Administration of China (SAC/TC 5).
Drafting organizations of this Document. CNOOC Changzhou Paint and Coatings Industry
Research Institute Co., Ltd.; Avic Biam New Materials Technology Engineering Co., Ltd.;
BIUGED Laboratory Instruments (Guangzhou) Co., Ltd.; Zhejiang Utop New Material Co.,
Ltd.; Ningbo Xin’an Paint Co., Ltd.; Shenzhen Grandland Environmental Protection Coatings
Co., Ltd.; Anhui Jianghuai Automobile Group Co., Ltd.; Guohengxin (Changzhou) Testing and
Certification Technology Co., Ltd.; Qingdao Jufang Environmental Protection Technology Co.,
Ltd.; Langfang AGM-KINLIN Material Technology Co., Ltd.; Union (Shaoguan) Chemical Co.,
Ltd.; Fujian Wanan Industry Group Co., Ltd.; Shanghai Research Institute of Paint & Coatings
Co., Ltd.; Hubei Baster Science and Technology Co., Ltd.; Anhui Linghu Paint Co., Ltd.;
Jiaxing Minhui Automotive Parts Co., Ltd.; Shuangta Paint Technology Co., Ltd.; SGS-CSTC
Standard Technical Services (Tianjin) Co., Ltd.; Baoji Chushi Metal Detection Limited
Liability Company; Yatu Advanced Materials Co., Ltd.; Guangdong Jiasheng Environmental
Protection High-Tech Materials Co., Ltd.; Beijing Qiyizhou New Material Technology Co., Ltd.;
Changsha Zuxing New Materials Co., Ltd.; Chinese Academy of Environmental Planning;
Qingyuan High-tech Huayuan Science and Technology Collaborative Innovation Research
Institute Co., Ltd.; Guangdong Youzhi New Materials Co., Ltd.; Yingde Yingze Chemical
Technology Co., Ltd.; Qingyuan Haoyu Chemical Technology Co., Ltd.; Giant (China) Co.,
Ltd.; Bauhinia Paints (Shanghai) Co., Ltd.; Jiangsu Canion Building Materials Co., Ltd.; Wuxi
Taihu Anticorrosive Materials Co., Ltd.; Suzhou Institute of Nano-Tech and Nano-Bionics,
CAS; ZhenGuYuan (Fujian) Waterborne Coating Technology Co., Ltd.; BEVS Industrial
(Guangzhou) Co., Ltd.; Ningbo Shintai Machinery Co., Ltd.; Zhejiang Anyi New Materials Co.,
Ltd.; and Fujian Voosun Building Materials Co., Ltd.
Chief drafting staffs of this Document. Chen Gang, Wang Chongwu, Peng Jufang, Yang Zhenbo,
Zhou Wenpei, Yang Yaliang, Cao Bihui, Xu Jinbao, Gu Erning, Liu Feng, Liu Huihui, Cui
Zhigang, Sun Xiaoguang, Tang Dongjie, Wang Meimei, Wu Ruiliang, Wu Zuogui, Fu Xianglin,
Xu Wenbin, Shi Shihang, Jing Xionggang, Ruan Weiming, Bao Youwen, Wang Lijun, Zeng
Mengjin, Wang Ning, Li Jiaqiang, Xu Zhiming, Xiao Jurong, Guo Weijie, Dao Jizhu, Hu Zihe,
Tu Jia, Liu Jiadong, Wei Chunyang, Zhang Yicai, Zeng Peigen, Ye Guoqiang, Liu Lijun, Yao
Pingcheng, Chen Fang, An Xiaowei, Wang Lizhen, Ma Kaiyi, and Zhou Lei.
This Document was first-time published in 1986; first-time revised in 1996; second-time
revised in 2006, and third-time revised hereby.
Paints and Varnishes – Determination of Film Hardness by
Pencil Test
IMPORTANT TIPS. The electronic version of this Document contains color content that
is intended to assist in the correct understanding of this Document. Therefore, users
should consider using a color printer to print this Document.
1 Scope
This Document specifies a method for determining the hardness of paint films by pushing a
pencil of known hardness across the film.
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.
3 Terms and Definitions
For the purposes of this Document, the following terms and definitions given in ISO 4618 apply.
ISO and IEC maintain terminology databases used for standardization work at.
4 Principle
Use a pencil lead with a specified geometric shape to press down on the surface of the paint
film at an angle of 45° under a load of (7.35 ± 0.15) N; and measure the pencil hardness of the
paint film by pushing the pencil on the paint film.
5 Apparatus
A level instrument is installed on the top of the instrument to ensure the level of the instrument
during the test.
6 Sample
According to the provisions of GB/T 3186, take a representative sample of the product under
test (or each product in the multi-coating system).
Inspect and prepare test samples according to the provisions of GB/T 20777.
7 Test Panel
Each painted test panel is dried (or baked) under the specified conditions and stand (if
applicable) for the specified time. Unless otherwise agreed, before testing, the test panel shall
be conditioned at a temperature of (23±2)℃ and a relative humidity of (50±5)% for at least 16h.
8 Operation Procedure
After agreement, a magnifying glass with a magnification of 6 times to 10 times can be used to
evaluate defects. If a magnifying glass is used, this shall be indicated in the report.
It is determined that a defect of some type as defined in Clause 9 has occurred.
The pencil hardness of the paint film is expressed as the hardness of the hardest pencil that does
not cause defects in the paint film.
9 Type of Defect
Scratching the paint film surface with a pencil lead will produce a series of defects on the paint
film surface.
10 Precision
No precision data available.
11 Test Report
The test report shall at least include the following contents.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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