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GB/T 30312-2025 English PDF

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GB/T 30312-2025: Test method for thermal shrinkage of dipped yarns and cords
Status: Valid

GB/T 30312: Evolution and historical versions

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
GB/T 30312-2025	English	209	Add to Cart	3 days [Need to translate]	Test method for thermal shrinkage of dipped yarns and cords	Valid	GB/T 30312-2025
GB/T 30312-2013	English	189	Add to Cart	3 days [Need to translate]	Test method for thermal shrinkage of yarns and cords	Valid	GB/T 30312-2013

Basic data

Standard ID	GB/T 30312-2025 (GB/T30312-2025)
Description (Translated English)	Test method for thermal shrinkage of dipped yarns and cords
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	G47
Classification of International Standard	83.140.99
Word Count Estimation	10,132
Date of Issue	2025-08-01
Date of Implementation	2026-02-01
Older Standard (superseded by this standard)	GB/T 30312-2013
Issuing agency(ies)	State Administration for Market Regulation, Standardization Administration of China

GB/T 30312-2025: Test method for thermal shrinkage of dipped yarns and cords

---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/GBT30312-2025
ICS 83.140.99 CCSG47 National Standard of the People's Republic of China Replaces GB/T 30312-2013 Test method for thermal shrinkage of dipped yarns, cords and cords 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 replaces GB/T 30312-2013 "Test method for thermal shrinkage of dipped yarn, cord and cord" and is in line with GB/T 30312-2013 Compared with the previous version, in addition to result adjustments and editorial changes, the main technical changes are as follows. a) The scope has been changed (see Chapter 1, Chapter 1 of the.2013 edition); b) Added terms and definitions (see Chapter 3); c) Added sample preparation device and requirements (see 5.3); d) The test environment has been changed (see 6.1, 5.1 of the.2013 edition); e) Sampling has been changed (see 6.3, 5.3 of the.2013 edition); f) The number of tests has been changed (see 6.4, 5.4 of the.2013 edition); g) The test conditions have been changed (see 6.5, 5.5 of the.2013 edition). 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 Rubber and Rubber Products of Standardization (SAC/TC35). This document was drafted by. Zhejiang Baiao New Materials Co., Ltd., Qingdao Haishengtai Materials Co., Ltd., Qingdao University of Science and Technology, Zhejiang Youfugao New Fiber Co., Ltd., Qingdao Kangwei Chemical Fiber Co., Ltd., Jinhua Yalun Chemical Fiber Co., Ltd., Changzhou Chaofeng Rubber Wire Technology Co., Ltd., Qingdao Keda New Rubber and Plastic Testing Service Co., Ltd. The main drafters of this document are. You Jiaqi, Liu Xiao, Shen Mei, Song Minggen, Ji Guanhua, Zhuge Leke, Yang Jie, Li Wei, and Gong Guoyong. The previous versions of this document and the documents it replaces are as follows. ---First published in.2013 as GB/T 30312-2013; ---This is the first revision. Test method for thermal shrinkage of dipped yarns, cords and cords

1 Scope

This document describes the test method for dry heat shrinkage and dry heat shrinkage force in hot air of dipped yarns, cords and cords. This document is applicable to the test of dry heat shrinkage properties of dipped yarns, cords and yarns made of nylon, polyester, vinylon, aramid and rayon. It is also applicable to the test of dry heat shrinkage properties of non-impregnated yarns, cords and cords made of the above fibers.

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 2941 Rubber physical test methods - General procedures for specimen preparation and conditioning GB/T 8170 Rules for rounding off values and expression and determination of limit values GB/T 32110 Terms and definitions for impregnated skeleton materials

3 Terms and Definitions

The terms and definitions defined in GB/T 32110 apply to this document.

4 Test Principle

By using a dry heat shrinkage meter or a heat cycle oven, the dipping time is measured and calculated in a constant temperature hot air. Dry heat shrinkage under pre-tension, dry heat shrinkage force or free dry heat shrinkage of yarn, cord or cord. 5.Test equipment 5.1 Dry Heat Shrinkage Tester 5.1.1 Temperature range. room temperature ~ 250°C. 5.1.2 Temperature control accuracy. ±1℃. 5.1.3 Instrument measurement accuracy. shrinkage rate ±0.05%, shrinkage force ±0.1N. 5.1.4 Heating length. 250mm. 5.1.5 Position of the specimen in the dry heat shrinkage instrument. Under the test state, the specimen should be located in the middle between the upper and lower heating plates to ensure the test results are correct. To ensure accurate results, the sample should not come into contact with the surface of the heating plate. The principle of the dry heat shrinkage instrument is shown in Figure 1.

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