BS ISO 11346-2014 Rubber vulcanized or thermoplastic Estimation of life-time and maximum temperature of use《硫化或热塑橡胶 使用寿命和最高使用温度的评估》.pdf
《BS ISO 11346-2014 Rubber vulcanized or thermoplastic Estimation of life-time and maximum temperature of use《硫化或热塑橡胶 使用寿命和最高使用温度的评估》.pdf》由会员分享,可在线阅读,更多相关《BS ISO 11346-2014 Rubber vulcanized or thermoplastic Estimation of life-time and maximum temperature of use《硫化或热塑橡胶 使用寿命和最高使用温度的评估》.pdf(22页珍藏版)》请在麦多课文档分享上搜索。
1、BSI Standards PublicationBS ISO 11346:2014Rubber, vulcanized orthermoplastic Estimationof life-time and maximumtemperature of useBS ISO 11346:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 11346:2014. The UK participation in its preparation was entrusted
2、to TechnicalCommittee PRI/22, Physical testing of rubber.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The B
3、ritish Standards Institution 2014.Published by BSI Standards Limited 2014ISBN 978 0 580 81992 6 ICS 83.060 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 Nov
4、ember 2014.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e d ISO 2014Rubber, vulcanized or thermoplastic Estimation of life-time and maximum temperature of useCaoutchouc vulcanis ou thermoplastique Estimation de la dure de vie et de la temprature maximale dutilisationINTERNA
5、TIONAL STANDARDISO 11346Third edition 2014-12-01Reference number ISO 11346:2014(E)BS ISO 11346:2014ISO 11346:2014(E)ii ISO 2014 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2014All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise
6、 in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCase p
7、ostale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 11346:2014ISO 11346:2014(E)Contents PageForeword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 14 Principle 15 Selection of tests
8、and ageing oven 26 Selection of threshold value . 27 Test pieces . 28 Exposure temperatures . 39 Exposure times . 310 Procedure. 311 Expression of results 411.1 Arrhenius procedure . 411.2 WLF procedure . 611.3 Limitations 812 Test report . 8Bibliography .10 ISO 2014 All rights reserved iiiBS ISO 11
9、346:2014ISO 11346:2014(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in
10、 a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commiss
11、ion (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents shou
12、ld be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives). Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for id
13、entifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents). Any trade name used in this document is information given for the conv
14、enience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword
15、 - Supplementary informationThe committee responsible for this document is ISO/TC 45, Rubber and rubber products, Subcommittee SC 2, Testing and analysis.This third edition cancels and replaces the second edition (ISO 11346:2004), of which it constitutes a minor revision.iv ISO 2014 All rights reser
16、vedBS ISO 11346:2014ISO 11346:2014(E)IntroductionThe rate of a chemical reaction normally increases with increase in temperature. By exposing test pieces to a series of elevated temperatures, the relation between the reaction rate of degradative mechanisms and temperature can be deduced. Estimates c
17、an then be made by extrapolation of the degree of degradation after a given time at a given temperature or the time at a given temperature to reach a given degree of degradation.The reaction rate/temperature relationship can often be represented by the Arrhenius equation. The reaction rate at any gi
18、ven temperature is obtained from the change in the value of a selected property with exposure time at that temperature. The reaction rate can be represented by the time to a particular degree of degradation (threshold value) and this might be the only measure to use if the property/temperature relat
19、ion is complex.The Arrhenius approach is only suitable for chemical degradation reactions and might give wrong results for tests where physical (viscoelastic) changes cannot easily be separated from chemical changes.An alternative approach for rubbers is to use the Williams Landel Ferry (WLF) equati
20、on. This equation performs a time/temperature transformation and no assumptions are made as to the form of the property/time relation at any temperature. Hence, in principle, it can be applied to any physical property, including set and relaxation, or where the property/time relation is complex. Fur
21、ther explanation of the use of the WLF equation can be found in the literature.1During the preparation of this International Standard, account was taken of the contents of ISO 25782and IEC 60216.3 ISO 2014 All rights reserved vBS ISO 11346:2014ISO 11346:2014 (E)BS ISO 11346:2014Rubber, vulcanized or
22、 thermoplastic Estimation of life-time and maximum temperature of use1 ScopeThis International Standard specifies the principles and procedures for estimating the thermal endurance of rubbers from the results of exposure to elevated temperatures for long periods.Two approaches are specified (see Int
23、roduction): one using the Arrhenius relation; the other using the WLF equation.In this International Standard, the estimation of thermal endurance is based solely on the change in selected properties resulting from periods of exposure to elevated temperatures. The various properties of rubbers chang
24、e at different rates on thermal ageing, hence comparisons between different rubbers can only be made using the same properties.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated referenc
- 1.请仔细阅读文档,确保文档完整性,对于不预览、不比对内容而直接下载带来的问题本站不予受理。
- 2.下载的文档,不会出现我们的网址水印。
- 3、该文档所得收入(下载+内容+预览)归上传者、原创作者;如果您是本文档原作者,请点此认领!既往收益都归您。
下载文档到电脑,查找使用更方便
10000 积分 0人已下载
下载 | 加入VIP,交流精品资源 |
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- BSISO113462014RUBBERVULCANIZEDORTHERMOPLASTICESTIMATIONOFLIFETIMEANDMAXIMUMTEMPERATUREOFUSE 硫化 橡胶 使用寿命

链接地址:http://www.mydoc123.com/p-583532.html