GB/T 33100-2025 English PDF

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GB/T 33100-2025: Test methods of belt flexing fatigue for dipped cords
Status: Valid

GB/T 33100: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 33100-2025	209	Add to Cart	3 days	Test methods of belt flexing fatigue for dipped cords	Valid
GB/T 33100-2016	119	Add to Cart	2 days	Test methods of belt flexing fatigue for dipped cords	Valid

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Basic data

Standard ID: GB/T 33100-2025 (GB/T33100-2025)
Description (Translated English): Test methods of belt flexing fatigue for dipped cords
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: G47
Classification of International Standard: 83.140.99
Word Count Estimation: 10,128
Date of Issue: 2025-08-01
Date of Implementation: 2026-02-01
Older Standard (superseded by this standard): GB/T 33100-2016
Issuing agency(ies): State Administration for Market Regulation, Standardization Administration of China

GB/T 33100-2025: Test methods of belt flexing fatigue for dipped 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/GBT33100-2025
ICS 83.140.99 CCSG47 National Standard of the People's Republic of China Replaces GB/T 33100-2016 Belt flexural fatigue test method for dipped cord 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 33100-2016 "Dipped Cord Belt Flexural Fatigue Test Method" and is consistent with GB/T 33100-2016. In addition to structural adjustments and editorial changes, the main technical changes are as follows. --- Changed the scope of the standard (see Chapter 1, Chapter 1 of the.2016 edition); --- Added terms and definitions (see Chapter 3); --- Added the requirements for the test temperature selection range of the belt flexure fatigue machine (see 5.1); --- Added release paper preparation (see 6.2.3); --- Changed the specimen mold preparation, vulcanization and specimen cutting (see 6.2.4, 5.2.3 of the.2016 edition); --- Added a schematic diagram of the placement of the vulcanized mold sample (see 6.2.4); --- Changed the preparation method and number of specimens for the breaking strength test (see 7.3.1, 6.3.1 of the.2016 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. Jiangsu Junma Science and Technology Development Co., Ltd., Qingdao University of Science and Technology, Qingdao Haishengtai Materials Co., Ltd., Jinhua Ya Lun Chemical Fiber Co., Ltd., Zhejiang Youfu High-tech Fiber Co., Ltd., Qingdao Kangwei Chemical Fiber Co., Ltd., Qingdao Keda New Rubber and Plastic Testing Services Ltd. The main drafters of this document are Yan Hua, Liu Li, Qu Jinlei, Xiang Ruiyang, Song Minggen, Ji Guanhua, and Li Chaoqin. The previous versions of this document and the documents it replaces are as follows. ---First published in.2016 as GB/T 33100-2016; ---This is the first revision. Belt flexural fatigue test method for dipped cord

1 Scope

This document describes the determination of the breaking strength retention of dipped cords after flexural fatigue tests on strip specimens made of dipped cords and rubber vulcanization. Test methods for fatigue resistance properties such as adhesion rate, adhesive peel force, and rubber coverage. This document is applicable to the determination of the belt-type flexural fatigue resistance of the dipped rubber cord made of fiber, and is also applicable to the dipped rubber yarn, dipped Determination of fatigue resistance of rubber-impregnated skeleton materials such as rubber cords.

2 Normative citations

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 16491 Electronic universal testing machine GB/T 32108 Test method for tensile properties of dipped cords, yarns and cords GB/T 32109 Test method for adhesive peeling performance of dipped yarn and cord fabric 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

The strip rubber specimens made by vulcanizing the dipped cord and rubber were tested using a belt flexure tester according to the set test conditions. Repeated bending is performed to simulate the repeated fatigue of the rubber cord itself and the relationship between the rubber and the cord when the rubber cord is used in tires and other rubber products. The tensile testing machine is used to test the adhesive peeling force between the rubber and the cord in the fatigue area of the sample after flexural fatigue and the peeling surface of the fatigue area. Rubber coverage, the ratio of the adhesive peeling strength of the fatigue specimen to the adhesive peeling strength of the unflexed fatigue specimen is the flexing strength of the dipped cord The tensile testing machine was used to test the breaking strength of the rubber-impregnated cord after fatigue peeling. The breaking strength was the same as that of the unimpregnated cord. The ratio of the breaking strength values of the dipped cord peeled off from the flexural fatigue comparison specimen is the breaking strength retention rate of the dipped cord before and after flexing.

5 Instruments and Tools

5.1 Belt flexure testing machine The belt flexure tester used in this document should be able to make the belt rubber specimen contact the pulley at a certain angle, with the two ends of the specimen respectively The connecting rod is connected to the drive shaft through the rocker arm, and the load can be applied to the sample through the pulley. The counter can set and record the number of times the specimen is bent at a certain tensile tension, as shown in Figure 1, and must meet the following requirements. ......

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