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Plastics - Quantitative evaluation of scratch-induced damage and scratch visibility
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Basic data
| Standard ID | GB/T 44303-2024 (GB/T44303-2024) |
| Description (Translated English) | Plastics - Quantitative evaluation of scratch-induced damage and scratch visibility |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | G31 |
| Word Count Estimation | 28,256 |
| Date of Issue | 2024-08-23 |
| Date of Implementation | 2024-08-23 |
| Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration |
GB/T 44303-2024: Plastics - Quantitative evaluation of scratch-induced damage and scratch visibility
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 83.080.01
CCSG31
National Standard of the People's Republic of China
Quantitative assessment of scratch damage and scratch visibility in plastics
(ISO 17541.2014, MOD)
Released on 2024-08-23
2025-03-01 Implementation
State Administration for Market Regulation
The National Standardization Administration issued
Table of Contents
Preface III
Introduction V
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 Principle 3
5 Equipment 3
5.1 Overview 3
5.2 Scrape 3
5.3 Force Sensor and Displacement Sensor 4
5.4 Normal force 4
5.5 Test speed 4
5.6 Sample holder 4
6 Sample 4
6.1 General 4
6.2 Sample shape and size 5
6.3 Sample preparation 5
6.4 State Adjustment 5
6.5 Number of samples 5
7 Test Step 5
7.1 Test environment 5
7.2 Test preparation 5
7.3 Test 6
8 Results Analysis 7
8.1 Calculation of scratch strength and scratch resistance 7
8.2 Analysis of unidirectional damage test (SD) results 7
8.3 Analysis of multidirectional damage test (MD) results 8
9 Results show 9
9.1 Unidirectional damage test 9
9.2 Multi-directional damage test 9
10 Test Report 10
Appendix A (Informative) Structure Number Comparison List 11
Appendix B (Informative) Three-dimensional color model 13
Appendix C (informative) Example of quantitative assessment of scratch damage and scratch visibility 14
Reference 18
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting.
This document is modified to adopt ISO 17541.2014 "Quantitative assessment of scratch damage and scratch visibility in plastics".
Compared with ISO 17541.2014, this document has many structural adjustments. Comparison table of structural number changes between the two documents
See Appendix A.
The technical differences between this document and ISO 17541.2014 and their reasons are as follows.
--- ISO 6508-1 (see 5.2) has been replaced by the normative reference GB/T 230.1 to adapt to my country's technical conditions and increase operability
Sex;
--- ISO 19252 (see 5.2) has been replaced by the normative reference GB/T 41878 to adapt to my country's technical conditions and increase operability
Sex;
--- "Test load" (see 5.4) is replaced by "normal force" to facilitate the understanding of the content of this document;
--- ISO 20753 (see 6.2) has been replaced by the normative reference GB/T 37426 to adapt to my country's technical conditions and increase operability
Sex;
--- ISO 294-1 (see 6.3) has been replaced by the normative reference GB/T 17037.1 to adapt to my country's technical conditions and increase operability
Sexuality;
--- ISO 294-2 (see 6.3) has been replaced by the normative reference GB/T 17037.2 to adapt to my country's technical conditions and increase operability
Sexuality;
--- ISO 294-3 (see 6.3) has been replaced by the normative reference GB/T 17037.3 to adapt to my country's technical conditions and increase operability
Sexuality;
--- Added normative reference GB/T 17037.5 (see 6.3) to make this document applicable to a wider range of practical applications;
--- Added normative references to ISO 10724-1 (see 6.3) to make this document applicable to a wider range of practical applications;
--- ISO 291 (see 6.4) has been replaced by the normative reference GB/T 2918 to adapt to my country's technical conditions and increase operability.
--- Added "scratch length (when a scratch length other than 100 mm is selected)" and "test date" (see Chapter 10) to adapt to the technical requirements of my country.
Technical conditions and increase operability.
The following editorial changes were made to this document.
--- Added "Introduction";
--- Deleted the content repeated in "Scope" and "Principle";
--- Added "Note" (see 3.1, 3.2, 3.5, 3.8, 8.3.1);
--- Deleted the "Description" in Figure 3;
--- Deleted the definitions of "scratch damage index" and "scratch visibility index" in "Principle" (see Chapter 4);
--- Split the original formula (5) into formula (5) and formula (6) (see 8.2.3);
--- Split the original formula (8) into formula (9) and formula (10) (see 8.3.2);
--- Added Appendix A (informative) "Structure number comparison list".
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document was proposed by the China Petroleum and Chemical Industry Federation.
This document is under the jurisdiction of the National Technical Committee on Plastics Standardization (SAC/TC15).
This document was drafted by. Chengdu Product Quality Supervision and Inspection Institute, Sichuan University, and National High-tech Polymer Materials Industry Innovation Center.
Co., Ltd., Southwest Jiaotong University, Shenzhen Aidi Moulding Co., Ltd., Zhonglan Chenguang Chengdu Testing Technology Co., Ltd., Chengdu Silike Technology Co., Ltd.
Co., Ltd., Nanjing Hujiang Composite Materials Co., Ltd., Dongguan Lifuco Plastic Products Co., Ltd., Suzhou Ruitai Precision Plastic Co., Ltd.,
Zhejiang Zhongsheng New Materials Co., Ltd., Jiangxi Xulian New Materials Co., Ltd., Dongguan Mingkai Plastic Technology Co., Ltd., Ningbo
Zhongan Auto Parts Co., Ltd., Dongguan Aurora Precision Plastic Products Co., Ltd., Zhuhai Special Economic Zone Longshi Bottle Cap Co., Ltd., Dongguan
Gumai Optical Technology Co., Ltd., Henan Academy of Sciences Isotope Research Institute Co., Ltd., Xiangshan Boyu Auto Mould Manufacturing Co., Ltd., An
Huideyuan Cable Group Co., Ltd. and Coase Chemical Co., Ltd.
The main drafters of this document are. Zhang Xiaofei, Shen Jiabin, Wu Bo, Cai Zhenbing, Chen Xiaoyong, Zhang Yanjun, Xu Longping, Zhang Jie, Liu Hanqin, Zhou Guowen,
Ye Wenjin, Ma Junhui, Guo Shaoyun, Zheng Wen, Fang Xiuyang, Ling Lexu, Niu Guiming, Huang Cheng, Zhang Wei, Guo Peihong, Li Yanming, Zhang Zhenhai, Tang Jingjing,
Wu Longjie, Wang Chunlian, Liu Shubo, Tan Jingxian, Ning Chuangming, Zhang Fan.
Introduction
The test method for plastic scratch performance was developed by the automotive industry. The commonly used plastic scratch performance test methods in the industry, such as five-finger scratch
Scratch test, cross scratch test, hardness test pen scratch test, etc. can only load a constant load, and it is difficult to quickly determine the test load that causes scratch damage.
GB/T 41878-2022 applies a constant load or a linear increase in the scratch performance of the material.
The spherical scratch head was used to scratch the surface of the specimen, and the scratch visibility, scratch damage form, test load, tangential scratch force, and scratch
Corresponding relationships are established between parameters such as distance and critical normal load.
This paper establishes a method for quantitatively evaluating scratch damage and scratch visibility. First, a constant load or linear growth
The load is applied, and scratches are formed on the surface of the sample using a surface contact scraper or a line contact scraper; then, the scratches are scanned to generate a digital scratch image;
Finally, the scratch damage and scratch visibility were quantitatively evaluated using image analysis software.
Scratch usually includes mar. In recent years, with the continuous deepening of the research on scratch characterization technology,
Researchers have found that scratches and abrasions differ in formation mechanism and damage mode. The differences between scratches and abrasions will be further studied in future research.
This document does not yet distinguish between these differences.
Quantitative assessment of scratch damage and scratch visibility in plastics
1 Scope
This document describes two methods for quantitatively evaluating scratch damage and scratch visibility in plastics using coordinate values of a three-dimensional color model, including
Method A (constant load) and method B (linearly increasing load).
This document specifies the dimensions of the test specimen and the geometry of the scraper head.
This document applies to surface coated and uncoated thermoplastic molding materials and thermosetting molding materials.
2 Normative references
The contents of the following documents constitute essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
GB/T 230.1 Rockwell hardness test for metallic materials Part 1.Test method (GB/T 230.1-2018, ISO 6508-1.
2016,MOD)
GB/T 2918 Standard environment for conditioning and testing of plastic specimens (GB/T 2918-2018, ISO 291.2008, MOD)
GB/T 17037.1 Plastics - Preparation of injection moulded test specimens for thermoplastic materials - Part 1.General principles and multi-purpose test specimens and long
Preparation of strip specimens (GB/T 17037.1-2019, ISO 294-1.2017, MOD)
GB/T 17037.2 Plastics - Preparation of injection moulded test specimens for thermoplastic materials - Part 2.Small tensile test specimens (GB/T 17037.2-
2020,ISO 294-2.2018,MOD)
GB/T 17037.3 Plastics - Preparation of injection moulding specimens for thermoplastic materials - Part 3.Small square test pieces (GB/T 17037.3-
2003,ISO 294-3.2002,IDT)
GB/T 17037.5 Plastics - Preparation of injection moulded test specimens for thermoplastic materials - Part 5.Preparation of standard test specimens for anisotropy assessment
preparation
GB/T 37426 Plastic test specimens (GB/T 37426-2019, ISO 20753.2018, MOD)
GB/T 41878 Determination of scratch resistance of plastics (GB/T 41878-2022, ISO 19252.2008, MOD)
ISO 10724-1 Plastics thermosetting powder moulding compounds (PMCs) - Preparation of injection moulded test specimens - Part 1.General principles and multi-parameters
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Scratch
Under given conditions, the scraper causes damage to the sample surface when it moves on the sample surface.
Note 1.“Surface” refers to the surface at the macro scale rather than the micro scale.
Note 2.Such as material peeling and whitening.
...
