GB/T 39294-2020 English PDF

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GB/T 39294-2020: Determination of the discoloration performance for adhesive
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 39294-2020	149	Add to Cart	3 days	Determination of the discoloration performance for adhesive	Valid

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Basic data

Standard ID: GB/T 39294-2020 (GB/T39294-2020)
Description (Translated English): Determination of the discoloration performance for adhesive
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: G38
Classification of International Standard: 83.180
Word Count Estimation: 8,858
Date of Issue: 2020-11-19
Date of Implementation: 2021-10-01
Regulation (derived from): National Standard Announcement No. 26 of 2020
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 39294-2020: Determination of the discoloration performance for adhesive

---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.
Determination of the discoloration performence for adhesive ICS 83.180 G38 National Standards of People's Republic of China Determination of adhesive discoloration (yellowing) performance 2020-11-19 released 2021-10-01 implementation State Administration for Market Regulation Issued by the National Standardization Management Committee

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard was proposed by the China Petroleum and Chemical Industry Federation. This standard is under the jurisdiction of the National Adhesive Standardization Technical Committee (SAC/TC185). Drafting organizations of this standard. Zhongke Huayu (Fujian) Technology Development Co., Ltd., Guangdong Yutian Bali Technology Co., Ltd., Fujian Huafeng New Materials Co., Ltd., Shanghai Rubber Products Research Institute Co., Ltd., Shenzhen Beitest Testing Technology Co., Ltd., Xiamen Zhongxunde Testing Technology Co., Ltd., Guangzhou Institute of Synthetic Materials Co., Ltd., Fujian Institute of Material Structure, Chinese Academy of Sciences, Putian University, Putian Haixi Shoes Industry Information Center, Taixing Jinyuan Fine Chemical Co., Ltd., Fujian Product Quality Inspection Institute. The main drafters of this standard. Xu Yanqi, Lin Huayu, Fang Huayu, Zhang Jianqing, Zhou Yehua, Lin Yi, Peng Mei, Yi Jun, Xu Ying, Huang Deyi, Chen Jianfeng, Tang Zhaoyun, Li Jie. Determination of adhesive discoloration (yellowing) performance

1 Scope

This standard specifies the method for measuring the discoloration (yellowing) performance of adhesives. This standard applies to the qualitative and quantitative determination of discoloration (yellowing) properties of adhesives.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document. For undated references, the latest version (including all amendments) applies to this document. GB/T 250 Gray Scale for Textile Color Fastness Test Evaluation GB/T 2943 Adhesive Terms GB/T 10335.3 Coated paper and cardboard coated white cardboard GB 11614 flat glass GB/T 19258 UV germicidal lamp

3 Terms and definitions

The following terms and definitions defined in GB/T 2943 apply to this document. 3.1 Three eigenvalues of color Each color has a corresponding position in its color space coordinate system. Describe the position of a color in its color space coordinate system Three parameters set. Note. The three eigenvalues of colors vary according to different color models. This standard uses the Lab color model (Figure 1), using L*, a* and b* to represent the three characteristics of the color. Levy. among them. L* represents brightness, and the value range is [0,100]. The larger the L* value, the higher the brightness. When L* is 0, it represents black, and when it is 100, it represents white. a* represents the position from green to red, the value range is [-128,127], a* changes from a negative value to a positive value, and the corresponding color changes from green to red. b* represents the position from blue to yellow, the value range is [-128,127], b* changes from a negative value to a positive value, and the corresponding color changes from blue to yellow. ......

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