《BS-ISO-2285-2001.pdf》由会员分享，可在线阅读，更多相关《BS-ISO-2285-2001.pdf（18页珍藏版）》请在三一文库上搜索。
1、BRITISH STANDARD BS ISO 2285:2001 Rubber, vulcanized or thermoplastic Determination of tension set under constant elongation, and of tension set, elongation and creep under constant tensile load ICS 83.060 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Licensed Copy: sheffiel
2、dun sheffieldun, na, Mon Nov 27 07:38:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 2285:2001 This British Standard, having been prepared under the direction of the Sector Policy and Strategy Committee for Materials and Chemicals, was published under the authority of the Standards Policy and
3、Strategy Committee on 1 February 2002 BSI 1 February 2002 ISBN 0 580 38977 4 National foreword This British Standard reproduces verbatim ISO 2285:2001 and implements it as the UK national standard. It supersedes BS 903-A5:1997 which is withdrawn. The UK participation in its preparation was entrusted
4、 to Technical Committee PRI/22, Physical testing of rubber, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in
5、 this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract.
6、Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international committee any enquiries on the interpretation, or pro
7、posals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to iv, pages 1 to 10, an inside back cover and the
8、 back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 07:38:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Reference number ISO 2285:2
9、001(E) INTERNATIONAL STANDARD ISO 2285 Fifth edition 2001-12-15 Rubber, vulcanized or thermoplastic Determination of tension set under constant elongation, and of tension set, elongation and creep under constant tensile load Caoutchouc vulcanis ou thermoplastique Dtermination de la dformation rmanen
10、te sous allongement constant, et de la dformation rmanente, de lallongement et du fluage sous charge constante de traction Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 07:38:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 2285:2001(E) lcsid FDParemi ihTs PDF file mac ytnoaie nmt deddebyf
11、epca.se In ccaocnadrw eith Aebods licsneilop gnic,y this file mairp eb yntiv ro deewb detu shlal ton ide ebtlnu desse tt ehyfepacse whice era hml era deddebicsnede to i dnanstlaled t noeh comtupfrep reomrign tide ehti.gn In wodnlidaogn this file, trapies ccatpe tiereht nsnopser ehibility fo ton infr
12、iignA gnebods licnesilop gnic.y I ehTStneC Oarl Secrteiraat cacepts l oniibality in this .aera Ai ebods a tredamafo kr Aebod SystemI sncotaropr.de teDails fo ts ehoftwaorp ercudts ust deo crtaet ehis PDF file ceb na fi dnuon tlareneG eh Info leratit evo tf ehile; tP ehD-Fcrtaeiarap nomtesre were tpo
13、imizf deoirp rnti.gn Evyre casah er t neebakt neo snet eruhat tf ehile is suitlbaf eosu rI yb eSO memidob rebse. In the lnuikletneve y ttah alborp emler ati gnto it is fnuo,dlp saee inform ttneC ehlar Secrteiraat at tsserdda ehig leb nevwo. ISO 1002 Athgir lls serevr.de selnUs towrehise specfi,dei t
14、rap on fo this ilbupctanoi may cudorper ebtu ro deziliyna ni de fomr yb ro nam y,snae lecetrinoc m roecinahcal, inclidutohp gnocpoiym dna gnicrfoilm, wittuoh repmissii non writif gnrom ietreh ISa Ot tserdda ehs lebwo I roSOs membre ydob in teh ctnuoo yrf ttseuqer ehe.r ISO cirypothg fofice saCe tsop
15、ale 65 eneG 1121-HC02 av leT. 14 + 10 947 22 11 xaF 90 947 22 14 + 74 E-mail cirypothgiso.ch Web ww.wiso.ch Print dein Switlrez dna ii Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 07:38:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 2285:2001(E) iii Contents Page Foreword.iv 1 Scope1 2
16、Normative references1 3 Terms and definitions .2 4 Apparatus.2 5 Test pieces .4 6 Procedure.6 7 Expression of results8 8 Test report9 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 07:38:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 2285:2001(E) iv Foreword ISO (the International Organiz
17、ation 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 a subject for which a technical committee has been established
18、 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 Commission (IEC) on all matters of electrotechnical standardization. I
19、nternational Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publ
20、ication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights. ISO shall not be held responsible for identifying any or al
21、l such patent rights. ISO 2285 was prepared by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommittee SC 2, Testing and analyses. This fifth edition cancels and replaces the fourth edition (ISO 2285:1997), which has been technically revised. By incorporation of methods for the deter
22、mination of elongation, creep and tension set under constant load, it also cancels and replaces ISO 12244:1997. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 07:38:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI INTERNATIONAL STANDARD ISO 2285:2001(E) I SO 1002 All irthgs ersedevr 1 Rubber, v
23、ulcanized or thermoplastic Determination of tension set under constant elongation, and of tension set, elongation and creep under constant tensile load WARNING Persons using this International Standard should be familiar with normal laboratory practice. This standard does not purport to address all
24、of the safety problems, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and to ensure compliance with any national regulatory conditions. 1 Scope This International Standard specifies a number of methods of determining the di
25、mensional changes in test pieces of vulcanized or thermoplastic rubber during and after tensile loading for relatively short periods under constant elongation or constant loading. The constant-elongation test is intended to measure the ability of rubbers to retain their elastic properties after exte
26、nsion, at a standard laboratory temperature, to a specified strain which is maintained for a specified time at the same or at a specified higher temperature and then released at the test temperature or at the standard laboratory temperature. The constant-load test specifies a method for the determin
27、ation of elongation, creep and tension set of rubbers subjected to a constant load at standard laboratory temperature. The test methods are intended to measure the elastic properties of rubber in the hardness range 20 IRHD to 94 IRHD. The creep measurement is not recommended for product design or th
28、e evaluation of low-creep materials. For these, reference should be made to ISO 8013. No agreement between the results of this test or those of ISO 8013 should be inferred. NOTE The constant-load test is primarily intended for the measurement of state of cure and the quality control of thin- walled
29、products. An increase in the state of cure or degree of crosslinking is usually reflected in a decrease in set, creep or crosslinking. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standa
30、rd. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated bel
31、ow. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 188:1998, Rubber, vulcanized or thermoplastic Accelerated ageing and heat resistance tests ISO 471:1995, Rubber Temp
32、eratures, humidities and times for conditioning and testing ISO 4648:1991, Rubber, vulcanized or thermoplastic Determination of dimensions of test pieces and products for test purposes 1 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 07:38:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 22
33、85:2001(E) 2 ISO 1002 Allir thgser se devr ISO 4661-1:1993, Rubber, vulcanized or thermoplastic Preparation of samples and test pieces Part 1: Physical tests ISO 8013:1988, Rubber, vulcanized Determination of creep in compression or shear 3 Terms and definitions For the purposes of this Internationa
34、l Standard, the following terms and definitions apply. 3.1 tension set (constant load) elongation remaining in a test piece in the unloaded condition after it has been subjected to a constant load during a specified time, expressed as a percentage of the original length in the unloaded condition 3.2
35、 tension set (constant elongation) elongation remaining in a test piece in the relaxed condition after it has been subjected to a constant elongation during a specified time, expressed as a percentage of the elongation 3.3 creep increase in elongation of a test piece at constant load during a specif
36、ied time, expressed as a percentage of the elongation at the beginning of that time NOTE See also the definitions of creep functions given in ISO 8013. 4 Apparatus 4.1 Constant-elongation measurements 4.1.1 Straining device, consisting of a metal rod or other suitable guide fitted with pairs of hold
37、ers, one fixed and one moveable, for the ends of the test piece. The holders shall be in the form of self-tightening clamps for strip test pieces, in the form of jaws to hold tab (enlarged) ends, and in the form of flat pulleys of about 5 mm width and 10 mm diameter for ring test pieces. If so desir
38、ed, a means of operating the moving holder other than by hand may be provided, for example a threaded rod, provided that the tolerances on extension speed are met (see 6.1.2). Suitable stops or graduations may also be provided to avoid over-extension in the initial straining of the test piece. The s
39、training device shall be so designed that, when used at high temperatures in an oven, it can be placed with the reference length of the test piece perpendicular to the direction of the air flow. It shall also be of minimum mass in order to avoid excessive lag in the attainment of temperature equilib
40、rium after its introduction into the oven. A multiple-unit straining device may be used, provided that the foregoing requirements are met. 4.1.2 Oven, conforming to the requirements of ISO 188 (if the test is to be carried at a temperature above the standard laboratory temperature). For short heatin
41、g times, controlled air flow is not necessary. 4.1.3 Length-measuring device, capable of measuring the reference length of the test piece to the nearest 0,1 mm in accordance with ISO 4648:1991, method B. For strip test pieces, a bench marker shall be provided to mark the length used as the reference
42、 length. 2 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 07:38:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 2285:2001(E) I SO 1002 All irthgs ersedevr 3 For ring test pieces, the reference length may be the inner diameter of the ring, in which case a graduated cone allowing measurement
43、s to be made to the nearest 0,1 mm shall be used. Alternatively, if measurements are to be made on a straight reference length, a rigid channel, 3,5 mm deep and 20 mm wide for large ring test pieces and 1,75 mm deep and 10 mm wide for small ring test pieces, shall be provided for straightening porti
44、ons of such test pieces during marking and measuring of the reference length. 4.2 Constant-load measurements 4.2.1 Straining device, comprising clamps and weights, or equivalent, for loading the test pieces (see Figure 1). Key 1 Fixed clamp 2 Test piece 3 Clamp for holding weight 4 Weight Figure 1 S
45、training device 4.2.2 Thickness- and width-measuring device, comprising a gauge for measuring the thickness and, where appropriate, the width of the test piece in accordance with ISO 4648:1991, method A. The width of die-cut test pieces shall be taken as the distance between the cutting edges of the
46、 die in the narrow part, in which case a device capable of measuring the width to the nearest 0,05 mm in accordance with ISO 4661-1 shall be provided. 4.2.3 Length-measuring device, capable of measuring the test length in accordance with ISO 4648:1991, method B. 3 Licensed Copy: sheffieldun sheffiel
47、dun, na, Mon Nov 27 07:38:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 2285:2001(E) 4 ISO 1002 Allir thgser se devr 5 Test pieces 5.1 Preparation Test pieces shall be prepared in accordance with ISO 4661-1. They shall be cut from flat sheet 2 mm 0,2 mm thick (except large ring test pieces, whic
48、h shall be cut from sheet 4 mm 0,2 mm thick) prepared by moulding or slitting and buffing in accordance with ISO 4661-1. Strip test pieces and strip test pieces with enlarged ends shall be cut using a sharp die with a cutter as specified in ISO 4661-1. Ring test pieces shall be cut from sheet by mea
49、ns of a pair of concentric circular dies or rotating cutters. The separation of the two cutting edges shall not differ from the average value by more than 0,05 mm. 5.2 Test pieces for testing under constant elongation 5.2.1 Strip test pieces Strip test pieces shall be between 2 mm and 10 mm wide. A width of 6 mm is preferred. The length of any given strip depends on the selected reference length and the type of straining device. 5.2.2 Strip test pieces with enlarged ends Test pieces with enlarged ends shall be as shown in Figure 2,