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Basic data
| Standard ID | GB/T 45973-2025 (GB/T45973-2025) |
| Description (Translated English) | Paints and varnishes - Scratch test using a spring-loaded pen |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | G50 |
| Classification of International Standard | 87.040 |
| Word Count Estimation | 18,142 |
| Date of Issue | 2025-08-01 |
| Date of Implementation | 2026-02-01 |
| Issuing agency(ies) | State Administration for Market Regulation, Standardization Administration of China |
GB/T 45973-2025: Paints and varnishes - Scratch test using a spring-loaded pen
---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/GBT45973-2025
ICS 87.040
CCSG50
National Standard of the People's Republic of China
Paint and varnish spring pen scratch test
(ISO 22557.2019, IDT)
Released on August 1, 2025
Implementation on February 1, 2026
State Administration for Market Regulation
The National Standardization Administration issued
Preface
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 equivalent to ISO 22557.2019 "Paints and varnishes - Spring pen scratch test".
The following minimal editorial changes have been made to this document.
---Additional information on the corresponding types of scratches was added in 7.6.
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 Standardization of Paints and Pigments (SAC/TC5).
This document was drafted by. Yejian New Materials Co., Ltd., Changzhou Guanghui New Materials Research Institute Co., Ltd., Guohengxin (Changzhou) Testing
Certification Technology Co., Ltd., Biugeda Precision Instruments (Guangzhou) Co., Ltd., Fujian Wanan Industrial Group Co., Ltd., Fujian University of Technology Geotechnical Engineering
Research Institute Co., Ltd., CNOOC Changzhou Paint Chemical Research Institute Co., Ltd., Beijing Aerospace Xinli Technology Co., Ltd., Guangdong Nippon Paint Changrunfa
Science and Technology Materials Co., Ltd., Shanghai Customs Industrial Products and Raw Materials Testing Technology Center, and Minjiang University.
The main drafters of this document are. Mu Zhichao, Zhou Pingting, Zhao Yuwei, Han Dongxiao, He Wenhua, Zhao Shaohong, Shi Youliang, Chen Zhidong, Huang Wen, Chen Ye,
Cheers to Xiaosong, Lin Fengcai, Wang Ruijin, Sun Lei, and Huang Mingyue.
Paint and varnish spring pen scratch test
1 Scope
This document describes a method for determining the scratch resistance of coatings using a commonly used hand-held loaded scratch stylus to create scratches.
The test can be performed using a pointed stylus (Method A) or a disc stylus (Method B).
Both methods are universally applicable and can be used in the field as well as on curved surfaces. Method A can also be used for small specimens (maximum
The minimum size is 30mm×50mm).
The test can be performed as a "pass/fail" test (test requirement I) or as a graded test (test requirement II).
2 Normative references
The contents of the following documents constitute the 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.
ISO 868 Plastics and hard rubber - Determination of indentation hardness (Shore hardness) using a durometer [Plasticsandbonite-Determi-
Note. GB/T 2411-2008 Plastics and hard rubber - Determination of indentation hardness (Shore hardness) using a durometer (ISO 868.2003, IDT)
ness)
Note. GB/T 13452.2-2008 Paints and varnishes - Determination of film thickness (ISO 2808.2007, IDT)
ISO 4618 Paints and varnishes—Terms and definitions
Note. GB/T 5206-2015 Paints and varnishes - Terms and definitions (ISO 4618.2014, IDT)
ISO 13076 Paints and varnishes—Lighting and testing methods
Note. GB/T 37356-2019 Lighting conditions and methods for visual assessment of paints and varnishes (ISO 13706.2012, IDT)
ISO 14526-1 Plastics-Phenolicpowder-molding compounds-Part 1.Nomenclature and basic specifications
Note. GB/T 1404.1-2008 Plastic powdered phenolic moulding compounds Part 1.Nomenclature and basic specifications (ISO 14526-1.1999, IDT)
mericalsystem)
3 Terms and Definitions
For the purposes of this document, the terms and definitions defined in ISO 4618 and the following apply.
ISO and IEC maintain terminology databases used in their standardization work at the following addresses.
...
