GB/T 1685.2-2019 English PDF

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GB/T 1685.2-2019: Rubber, vulcanized or thermoplastic -- Determination of stress relaxation in compression -- Part 2: Testing with temperature cycling
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 1685.2-2019	264	Add to Cart	3 days	Rubber, vulcanized or thermoplastic -- Determination of stress relaxation in compression -- Part 2: Testing with temperature cycling	Valid

Similar standards

GB/T 1683   GB/T 1689   GB/T 1690   GB/T 1687.4   GB/T 1685   

Basic data

Standard ID: GB/T 1685.2-2019 (GB/T1685.2-2019)
Description (Translated English): Rubber, vulcanized or thermoplastic -- Determination of stress relaxation in compression -- Part 2: Testing with temperature cycling
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: G40
Classification of International Standard: 83.060
Word Count Estimation: 14,118
Date of Issue: 2019-12-10
Date of Implementation: 2020-11-01
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 1685.2-2019: Rubber, vulcanized or thermoplastic -- Determination of stress relaxation in compression -- Part 2: Testing with temperature cycling

---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.
(Vulcanized or thermoplastic rubber.Determination of compressive stress relaxation.Part 2. Test at cycling temperature) ICS 83.060 G40 National Standards of People's Republic of China Vulcanized or thermoplastic rubber Determination of compressive stress relaxation Part 2. Testing at cycling temperature Rubber, vulcanizedorthermoplastic- Part 2. Testingwithtemperaturecycling (ISO 3384-2..2012, IDT) 2019-12-10 release 2020-11-01 implementation State Administration of Market Supervision Published by the National Standardization Management Committee

Foreword

GB/T 1685 "Determination of Compression Stress Relaxation of Vulcanized Rubber or Thermoplastic Rubber" is intended to be divided into the following 2 parts. --- Part 1. Test at constant temperature; --- Part 2. Test at cycling temperature. This part is the second part of GB/T 1685. This section is drafted in accordance with the rules given in GB/T 1.1-2009. This section uses the translation method equivalent to ISO 3384-2..2012, Determination of Compression Stress Relaxation of Vulcanized Rubber or Thermoplastic Rubber. Part 2. Tests at cycling temperature. The Chinese documents that have a consistent correspondence with the international documents referenced normatively in this section are as follows. --- GB/T 528-2009 Determination of tensile stress and strain properties of vulcanized rubber or thermoplastic rubber (ISO 37..2005, IDT) --- GB/T 1690-2010 Test method for liquid resistance of vulcanized rubber or thermoplastic rubber (ISO 1817..2005, MOD) --- GB/T 2941-2006 General test procedures for the preparation and adjustment of rubber physical test methods (ISO 23529..2004, IDT) This section is proposed by the China Petroleum and Chemical Industry Federation. This section is under the jurisdiction of the National Rubber and Rubber Products Standardization Technical Committee (SAC/TC35). This section was drafted by. Northwest Rubber and Plastics Research and Design Institute Co., Ltd., Guangzhou Synthetic Materials Research Institute Co., Ltd., Double Star Group Co., Ltd., Gottwell Scientific Instruments (Qingdao) Co., Ltd., Qingdao Junxiang Technology Co., Ltd., Triangle Tire Co., Ltd., Shanghai Zhenjun Chemical Technology Co., Ltd., Jiangsu Mingzhu Testing Machinery Co., Ltd., Shanghai Hanhai Testing Technology Co., Ltd., Beijing Zhongtian Pengyu Technology Development Co., Ltd., Qingdao University of Science and Technology, Beijing Rubber Industry Research and Design Institute Co., Ltd. The main drafters of this section. Zhu Wei, Huang Lei, Wang Shuang, Yi Jun, Guo Fei, Huang Zhaohui, Sheng Entian, Zheng Lei, Zuo Jiqiang, Xu Qiuhuan, Xu Yi, Xi Zhengjun, Yang Chenyun, Bao Dafei, Ma Hao, Yang Zhuanqing, Zou Xinyang, Zhu Dan, Che Wei, Xie Junfang, Sun Siwen.

Introduction

When a constant strain is applied to the rubber, the force required to maintain the strain is not constant, but decreases with time, which This phenomenon is called "stress relaxation". On the contrary, when the rubber is subjected to constant stress, the strain increases with time.This phenomenon is called "Creeping." In essence, the main reasons for stress relaxation are physical and chemical processes. And under normal conditions these two processes will coexist, However, at room temperature or low temperature and/or under short-term conditions, stress relaxation is mainly caused by physical processes; under high temperature and/or long-term conditions Next, stress relaxation is mainly caused by chemical processes. When the life of the material needs to be studied, the GB/T 20028 "Arrhenius chart applied to vulcanized rubber or thermoplastic rubber can be used The test method is described in Life and Maximum Use Temperature. In addition to specifying the test temperature and time interval for the stress relaxation test, it is also necessary to specify the initial stress and the stress of the specimen, because these Will affect the test results of stress relaxation, especially for rubber containing fillers. The two cyclic test methods specified are designed for the following purposes. --- Method A. aging the sample by stress relaxation, and measuring the sealing force of the sample at low temperature; --- Method B. The sample is thermally stressed by stress relaxation, and the sealing force of the sample is measured at low temperature. The rubber products used in outdoor applications may be exposed to an ambient temperature between ring. When evaluating the practical performance and life of these rubber products, it is important to consider their shrinkage at low temperatures. Rubber will crystallize at low temperatures, which will further exacerbate its shrinkage. For example. rubber hoses and rubber seals for automobiles The sealing ring can maintain a good working condition at normal temperature, but leakage may occur at low temperature. Vulcanized or thermoplastic rubber Determination of compressive stress relaxation Part 2. Testing at cycling temperature Caution --- Testers using this section should be familiar with normal laboratory operating procedures. This section does not indicate all possible security It is the responsibility of the user to take appropriate safety and health measures and ensure compliance with the conditions stipulated by relevant national laws and regulations. Note. Some operations involved in this section may cause pollution to the local environment by using, generating some substances or generating waste. Safe handling and disposal should be performed in accordance with appropriate documents.

1 Scope

This part of GB/T 1685 specifies the method used to determine the vulcanized rubber or thermoplastic rubber compressed to and maintained at a constant temperature at the cycle temperature. Two methods to reduce the compressive force under a constant strain state. Method A. The test temperature is periodically alternated between high and low temperatures.The high temperature stage is used to evaluate the aging resistance of rubber materials. The sealing performance of the rubber material can be evaluated. Method B. The test temperature is continuously altered between high and low temperatures to generate thermal stress inside the rubber material. Compression force is measured by a continuous measurement system. Specimens shall be of both cylindrical and annular types. Samples of different shapes and sizes have different results, only the same shape and size The test results of the samples can be compared. The ring sample is particularly suitable for the measurement of stress relaxation in a liquid environment.

2 Normative references

The following documents are essential for the application of this document. For dated references, only the dated version applies to this article Pieces. For undated references, the latest version (including all amendments) applies to this document. GB/T 3512-2014 Vulcanized rubber or thermoplastic rubber hot air accelerated aging and heat resistance test (ISO 188..2011, IDT) GB/T 25269-2010 Calibration Guide for Rubber Testing Equipment (ISO 18899..2004, IDT) ISO 37..2011 Determination of tensile stress-strain properties of vulcanized or thermoplastic rubber (Rubber, vulcanizedorthermo- plastic-Determinationoftensilestress-strainproperties) ISO 1817 Test Method for Liquid Resistance of Vulcanized Rubber or Thermoplastic Rubber (Rubber, vulcanizedorthermoplastic-De- terminationoftheeffectofliquids) ISO 23529 General Test Procedures for the Preparation and Adjustment of Rubber Physical Test Methods (Rubber-General procedures- paringandconditioningtestpiecesforphysicaltestmethods)

3 terms and definitions

The following terms and definitions apply to this document. 3.1 Compression stress relaxation The phenomenon that the compressive force decreases with time after constant compression deformation is applied. ......

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