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GB/T 11186-2025: Methods for measuring the colour of coatings
Status: Valid GB/T 11186: Evolution and historical versions
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| GB/T 11186-2025 | English | 449 |
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Methods for measuring the colour of coatings
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GB/T 11186-2025
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| GB/T 11186.1-1989 | English | 275 |
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Methods for measuring the colour of paint films. Part 1: Principles
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GB/T 11186.1-1989
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PDF similar to GB/T 11186-2025
Basic data | Standard ID | GB/T 11186-2025 (GB/T11186-2025) | | Description (Translated English) | Methods for measuring the colour of coatings | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G50 | | Classification of International Standard | 87.040 | | Word Count Estimation | 22,221 | | Date of Issue | 2025-06-30 | | Date of Implementation | 2026-01-01 | | Older Standard (superseded by this standard) | GB/T 11186.1-1989, GB/T 11186.2-1989, GB/T 11186.3-1989 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 11186-2025: Methods for measuring the colour of coatings---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/GBT11186-2025
ICS 87.040
CCSG50
National Standard of the People's Republic of China
Replace GB/T 11186.1-1989, GB/T 11186.2-1989, GB/T 11186.3-1989
Coating color measurement method
Released on June 30, 2025
Implementation on January 1, 2026
State Administration for Market Regulation
The National Standardization Administration issued
Table of Contents
Preface III
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 Color Coordinates 2
4.1 Overview 2
4.2 CIE1964 Supplementary Standard Colorimetric System (also known as the 10° Field of View X10Y10Z10 Colorimetric System) 2
4.3 Color Coordinates of CIE1976 (L*a*b*) Color Space 3
5 Selection of Standard Colorimetric Observers and Standard Illuminants 4
6 Spectral radiance characteristics 4
7 Lighting and viewing conditions 4
8 Selection of lighting and observation conditions 5
8.1 General 5
8.2 Smooth non-textured coating 5
8.3 Surface textured coating 5
9 Color Measurement 6
9.1 Principle 6
9.2 Instruments 6
9.3 Reflectance Standard 7
9.4 Sampling and specimen preparation 9
9.5 Operation steps 9
10 Color Difference Calculation 10
10.1 Overview 10
10.2 Calculate the total color difference using the CIELAB color difference formula 10
10.3 Brightness difference 11
10.4 Color saturation difference 11
10.5 Hue difference 11
10.6 Color difference of near-white samples 11
11 Test Report11
Appendix A (Normative) Color Matching Functions for 10° Observers with 5nm Wavelength Intervals 12
Appendix B (Normative) Relative spectral power distribution s(λ) of standard illuminants D65 and A at 5nm wavelength intervals 15
Reference 18
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 is required.
This document replaces GB/T 11186.1-1989 "Measurement of coating color - Part 1.Principles", GB/T 11186.2-
1989 "Measurement method of coating color Part 2 Color measurement" and GB/T 11186.3-1989 "Measurement method of coating color Part 3
Partial color difference calculation". This document is based on GB/T 11186.1-1989 and integrates GB/T 11186.2-1989 and GB/T 11186.3-
Compared with GB/T 11186.1-1989, in addition to structural adjustments and editorial changes, the main technical changes in GB/T 11186.1-1989 are as follows.
a) The scope of the standard has been changed (see Chapter 1, Chapter 1 of GB/T 11186.1-1989);
b) Deleted the standard illuminator (Chapter 4 of GB/T 11186.1-1989);
c) Added options for lighting and observation conditions (see Chapter 8);
d) Added color measurement test method (see Chapter 9);
e) Added the calculation method of color difference (see Chapter 10);
f) Added the content required in the test report (see Chapter 11).
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. Guohengxin (Changzhou) Testing and Certification Technology Co., Ltd., Hangzhou Yuanfang Optoelectronic Information Co., Ltd., CNOOC
Changzhou Environmental Protection Coatings Co., Ltd., Changzhou Jiaerke Simulation Equipment Co., Ltd., Biugeda Precision Instruments (Guangzhou) Co., Ltd., Zhejiang Genyuan Coatings
Materials Technology Co., Ltd., Xinhe New Materials Co., Ltd., Tianjin Dengta Paint Industrial Development Co., Ltd., Zhejiang Daqiao Paint Co., Ltd.,
Zhejiang Tiannv Group Paint Co., Ltd., Yejian New Materials Co., Ltd., Fujian Wanan Industrial Group Co., Ltd., Zhejiang Special Equipment
Scientific Research Institute, Meichao Group Co., Ltd., Guangdong Zhuhai Quality Metrology Supervision and Inspection Institute, Guangdong Ruizhi Environmental Protection Technology Co., Ltd.,
Xuanwei (Guangdong) New Materials Co., Ltd., Xiangjiang Coatings Technology Co., Ltd., Anhui Footprint New Materials Technology Co., Ltd., Changzhou Institute of Technology, Changzhou
Tianan Special Coatings Co., Ltd., Shandong Yinjian Metallic Pigments Co., Ltd., Guangdong Shunde Kawasaki Auto Parts Co., Ltd., Cangzhou Lingang
Kaiyin New Materials Technology Co., Ltd., Guangdong Hengzhiguang Environmental Protection New Materials Co., Ltd., Zhejiang Hongli New Materials Co., Ltd., China Railway Fourth Engineering Bureau Group
Steel Structure Construction Co., Ltd., Lianyungang Alkali Industry Co., Ltd., Fujian Kuncai Materials Technology Co., Ltd., Zhengtai New Materials Technology Co., Ltd.
Any company.
The main drafters of this document are. Li Guangdong, Sun Jianpei, Wang Lei, Zhou Wenpei, Wang Peng, Huang Wen, Huang Chao, Zhang Haodong, Li Yuewu, Wei Naiying, Liu Chuanqi,
Shi Jianqun, Yuan Meng, Niu Zhiqiang, Wu Yuhu, Qiu Xianfeng, Wu Libin, Duan Qiong, Xue Fang, Miao Xuepei, Shen Qing, Liu Enpeng, Liu Huayun, Wang Xin, Li Yiquan,
Zheng Wentao, Wang Ruijin, Chen Tao, Wang Kai, Cai Zhiming, and Xie Bingkun.
The previous versions of this document and the documents it replaces are as follows.
---GB/T 11186.1, first issued in 1989;
---GB/T 11186.2, first issued in 1989;
---GB/T 11186.3, first issued in 1989;
--- This is the first revision and is integrated into GB/T 11186.
Coating color measurement method
1 Scope
This document describes the basic conditions and measurement methods for measuring the color coordinates of coatings, as well as the quantitative colorimetric evaluation of small color differences between coatings.
Price method.
This document is applicable to the determination of the color of reflected light, that is, coatings that show a uniform color (i.e. monochrome) when inspected by normal vision.
Used to measure coatings that cannot completely cover opaque substrates (belonging to opaque system coatings).
This document is not applicable to the determination of luminous coatings, transparent and translucent coatings (e.g. coatings used on display or lamp glass), reflective coatings
The colour of films (e.g., films used for traffic markings) and metallic films (films containing effect pigments).
Note. There are many formulas for calculating the color difference between two samples based on their color coordinates, but the results calculated by these formulas cannot be completely consistent with the visual results in all cases.
There are two common formulas recommended by the International Commission on Illumination (CIE) in 1976.One of them is the
The prescribed CIE1976 (L*a*b*) color difference formula has been proven to be of practical significance for the chromaticity evaluation of coatings.
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.
GB/T 1727 General method for preparation of paint films
GB/T 3186 Sampling of paints, varnishes and raw materials for paints and varnishes
GB/T 5698 Color Terminology
GB/T 9271 Paints and varnishes standard test panels
GB/T 9278 Temperature and humidity for condition adjustment and testing of coating samples
GB/T 9761 Paints and varnishes Visual colour comparison of paints
GB/T 13452.2 Determination of film thickness of paints and varnishes
3 Terms and Definitions
The terms and definitions defined in GB/T 5698 and the following apply to this document.
3.1
Under specified lighting conditions, within a specified solid angle, the radiant flux or luminous flux Φaλ of wavelength λ reflected from an object is equal to the radiant flux or luminous flux Φaλ of wavelength λ reflected from a completely diffuse object.
The spectral reflectance factor is the ratio of the radiant flux or luminous flux Φnλ of wavelength λ reflected by the reflecting surface. It is expressed as R(λ), see formula (1).
R(λ)=
Φaλ
Φnλ
(1)
Where.
Φaλ---Radiant flux or luminous flux of wavelength λ reflected from an object, in watts (W) or lumens (lm);
Φnλ---The radiant flux or luminous flux of wavelength λ reflected from a completely diffuse reflecting surface, in watts (W) or lumens (lm).
Note. This document specifies that the spectral reflectance factor should be used instead of the CIE spectral radiance factor. Commercial instruments are not suitable for measuring the spectral radiance factor because the reflected light
The dispersion of the line will cause systematic errors.
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