GB/T 42951-2023 English PDF

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GB/T 42951-2023: Timekeeping instruments - Watch external parts made of hard material - General requirements and test methods
Status: Valid

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Basic data

Standard ID: GB/T 42951-2023 (GB/T42951-2023)
Description (Translated English): Timekeeping instruments - Watch external parts made of hard material - General requirements and test methods
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: Y11
Classification of International Standard: 39.040.10
Word Count Estimation: 14,118
Date of Issue: 2023-08-06
Date of Implementation: 2024-03-01
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 42951-2023: Timekeeping instruments - Watch external parts made of hard material - General requirements and test methods

---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 39.040.10 CCSY11 National Standards of People's Republic of China Watch appearance parts made of hard materials for chronograph instruments General requirements and test methods (ISO 18684.2020,IDT) Published on 2023-08-06 2024-03-01 Implementation State Administration for Market Regulation Released by the National Standardization Administration Committee

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents" Drafting. This document is equivalent to ISO 18684.2020 "General requirements and test methods for appearance parts of watches made of hard materials for timekeeping instruments". Please note that some content in this document may be subject to patents. The publisher of this document assumes no responsibility for identifying patents. This document is proposed by China Light Industry Federation. This document is under the jurisdiction of the National Watch and Clock Standardization Technical Committee (SAC/TC160). This document was drafted by. Fiyta Precision Technology Co., Ltd., Shenzhen Nanshan District Quality and Technology Association, Zhuhai Rossini Watch Industry Co., Ltd. Co., Ltd., Shenzhen Titan Clock Technology Co., Ltd., Tianwang Electronics (Shenzhen) Co., Ltd., Shenzhen Geya Watch Industry Co., Ltd., Shenzhen Guzun Watch Industry Co., Ltd., Zhangzhou Hengli Electronics Co., Ltd., Zhangzhou Yingzi Watch Co., Ltd., Shenzhen Chuangjindaiyin Technology Co., Ltd. company. The main drafters of this document. Guo Didi, Jin Lei, Li Bei, Guo Xingang, Zhang Guangzhong, Fan Weiqun, Zhang Qian, Li Yuzhong, Ma Tao, Sha Linkai, Tang Xinyi, Qi Xiange, Wang Zesheng, Shao Yueming, Zhang Fang, Chen Huangting, Hu Shaohua. Watch appearance parts made of hard materials for chronograph instruments General requirements and test methods

1 Scope

This document specifies the performance of parts, components, and components in terms of resistance to mechanical impact, thermal shock, corrosion, scratches, light, and wear. This document applies to parts made of bulk materials with a Vickers hardness value of not less than 1200. This document covers watches in which all or part of the exterior parts, except for the watch glass, are made of hard materials.

2 Normative reference documents

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, the dated quotations For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to this document. GB/T 38020.2-2019 Gold alloy covering of watch cases and accessories Part 2.Purity, thickness, corrosion resistance and accessories Focused testing (ISO 3160-2.2015, MOD) Note. There is no technical difference between the quoted content of GB/T 38020.2-2019 and the quoted content of ISO 3160-2.2015. GB/T 38022-2019 Shock-proof watches (ISO 1413.2016, IDT) ISO 105-A02 Textiles Color Fastness Test Part A02.Gray Sample Card for Assessing Discoloration (Textiles-Testsfor Note. GB/T 250-2008 Gray sample card for evaluating discoloration in textile color fastness testing (ISO 105-A02.1993, IDT) ISO 4892-1 Plastics Laboratory Light Source Exposure Test Methods Part 1.General (Plastic-Methods of exposure to Note. GB/T 16422.1-2019 Plastic laboratory light source exposure test methods Part 1.General principles (ISO 4892-1.2016, IDT) spraytests) Note 1.GB/T 10125-2021 Artificial atmosphere corrosion test salt spray test (ISO 9227.2017, MOD) Note 2.There is no technical difference between the quoted content of ISO 9227.2022 and the quoted content of ISO 9227.2017. ISO /CIE11664-4 Colorimetry Part 4.CIE1976L*a*b* color space (Colorimetry-Part 4.CIE1976 L*a*b*colourspace) Note. GB/T 33725-2017 Wear, scratch and impact resistance test of watch cases and accessories (ISO 23160.2011, MOD)

3 Terms and definitions

The following terms and definitions apply to this document. 3.1 Appearance partsexternalpart < Watch Category> Watch parts, components, and components that are attached to the movement and play a role in the shape, protection, fixation, and control of the movement. ......

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