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Leather - Physical and mechanical tests - Determination of water vapour absorption
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Basic data
| Standard ID | GB/T 45613-2025 (GB/T45613-2025) |
| Description (Translated English) | Leather - Physical and mechanical tests - Determination of water vapour absorption |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | Y46 |
| Classification of International Standard | 59.140.30 |
| Word Count Estimation | 10,137 |
| Date of Issue | 2025-05-30 |
| Date of Implementation | 2025-12-01 |
| Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration |
GB/T 45613-2025: Leather - Physical and mechanical tests - Determination of water vapour absorption
---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 59.140.30
CCSY46
National Standard of the People's Republic of China
Physical and mechanical tests on leather. Determination of hygroscopicity
(ISO 17229.2016, MOD)
Released on 2025-05-30
2025-12-01 Implementation
State Administration for Market Regulation
The National Standardization Administration issued
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 17229.2016 “Leather - Physical and mechanical tests - Determination of hygroscopicity”.
Compared with ISO 17229.2016, 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 17229.2016 and their reasons are as follows.
--- Deleted the specific test content involved in the principle (see Chapter 3 of ISO 17229.2016), which is in line with the writing practice of my country's standards
Useful, easy to use;
--- Regarding the regulation of die cutter and specimen, the normative reference QB/T 2707 replaces ISO 2419 (see 5.6 and 6.3).
To adapt to my country's technical conditions and be easy to use;
--- Regarding the provisions for test water, the normative reference GB/T 6682 replaces ISO 3696 (see 5.7) to adapt to my country's
Technical conditions, easy to use;
--- Regarding the provisions for sampling of standard parts, the normative reference GB/T 39364 replaces ISO 2418 (see 6.1) to adapt to
Our country's technical conditions make it easy to use;
--- Added provisions for sampling from non-standard parts (see 6.1) to meet the daily testing needs of sampling directly from shoes and clothing;
--- Added provisions for the test environment (see 6.3) to avoid ambiguity;
--- Increased the optionality of test time (see 7.5) to meet the testing requirements of different types of products;
--- Changed the content of the test report (see Chapter 9) to be consistent with other standards in the industry.
The following editorial changes were made to this document.
--- Added the first-level title of "Sampling and specimen preparation";
--- Added examples of sample placement;
--- Added explanations for some letter codes in the formula;
--- Replaced ISO 14268 with the informative reference GB/T 39369.
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 China Light Industry Federation.
This document is under the jurisdiction of the National Technical Committee for Standardization of Leather Industry (SAC/TC252).
This document was drafted by. Guangdong Xinhuwei Industrial Investment Co., Ltd., Chongqing Metrology and Quality Inspection Institute, Anhui Zhongyang Leather Technology
Co., Ltd., China Leather and Shoe Research Institute Co., Ltd., Fujian Zhongyu Water-based Microfiber Technology Co., Ltd., Ganba Desiccant (Shenzhen) Co., Ltd.
Co., Ltd., China Light Industry Inspection and Certification Co., Ltd., and China Light Industry Inspection and Certification (Jinan) Co., Ltd.
The main drafters of this document are. Bu Qiaoqiao, Liang Jiajun, Zhang Li, Liu Yunjun, Ren Keshuai, Ding Deyu, Yang Qiuyun, and Wei Xiaoxiao.
Physical and mechanical tests on leather. Determination of hygroscopicity
1 Scope
This document describes the test method for the hygroscopicity of leather.
This document is applicable to the determination of hygroscopicity of various types of leather (especially upper leather and lining leather).
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 6682 Specifications and test methods for water used in analytical laboratories (GB/T 6682-2008, ISO 3696.1987, MOD)
GB/T 39364 Sampling locations for chemical, physical, mechanical and colour fastness tests on leather (GB/T 39364-2020, ISO 2418.
2017,MOD)
QB/T 2707 Preparation and conditioning of leather physical and mechanical test specimens
3 Terms and definitions
There are no terms or definitions that require definition in this document.
4 Principle
Clamp the leather sample and the impermeable material above a container filled with water. After a specified time, weigh the mass of the sample and calculate the mass before and after the test.
The increase in sample mass per unit area is used to characterize the hygroscopicity of the sample.
5.Instruments and Materials
5.1 Cylindrical container, made of metal or glass, with an inner diameter of (35 ± 0.5) mm, an inner depth of (104 ± 1) mm, and a top outer diameter ≥ 55 mm, with
A metal ring or cover is used to secure the specimen to the cylindrical container.
5.2 Analytical balance, graduation value 0.001g.
5.3 Timer, with a graduation value of 1min.
5.4 Vernier caliper, graduation value is 0.1mm.
5.5 A disc made of impermeable material (such as rubber or metal) with the same diameter as the test specimen.
5.6 Die cutter. in accordance with the requirements of QB/T 2707, with an inner wall of a cylinder with a diameter of (43±1) mm.
5.7 Distilled water or deionized water, in accordance with the requirements for Grade III water in GB/T 6682.
6 Sampling and specimen preparation
6.1 Sampling
Follow the provisions of GB/T 39364.If it is not possible to take samples from the standard parts (such as directly from shoes or clothing),
...
