1、BS ISO28702:2008ICS 83.140.40NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDRubber and plasticshoses and tubing Textile-reinforcedtypes Sub-ambienttemperature crush testThis British Standardwas published underthe authority of theStandards Policy andStrategy Com
2、mittee on 30November 2008 BSI 2008ISBN 978 0 580 58710 8Amendments/corrigenda issued since publicationDate CommentsBS ISO 28702:2008National forewordThis British Standard is the UK implementation of ISO 28702:2008.The UK participation in its preparation was entrusted to TechnicalCommittee PRI/66, Ru
3、bber and plastics tubing, hoses and hoseassemblies.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application.Compliance wit
4、h a British Standard cannot confer immunityfrom legal obligations.BS ISO 28702:2008Reference numberISO 28702:2008(E)ISO 2008INTERNATIONAL STANDARD ISO28702First edition2008-11-01Rubber and plastics hoses and tubing Textile-reinforced types Sub-ambient temperature crush test Tuyaux et tubes en caoutc
5、houc et en plastique Types avec armature textile Essai dcrasement temprature infrieure la temprature ambiante BS ISO 28702:2008ISO 28702:2008(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not b
6、e edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobes licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe i
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8、er bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2008 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or b
9、y any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-m
10、ail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2008 All rights reservedBS ISO 28702:2008ISO 28702:2008(E) ISO 2008 All rights reserved iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies)
11、. 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 has the right to be represented on that committee. International organizations, governmental and non
12、-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. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part
13、 2. 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. Publication as an International Standard requires approval by at least 75 % of the member bodies casting
14、a vote. 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 identifying any or all such patent rights. ISO 28702 was prepared by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommi
15、ttee SC 1, Hoses (rubber and plastics). BS ISO 28702:2008ISO 28702:2008(E) iv ISO 2008 All rights reservedIntroduction This International Standard can be used to test the low-temperature properties of hoses whereby the brittle temperature of materials used for the lining and cover can be assessed. T
16、he method does not measure the flexibility of hoses at the test temperature. Other sub-ambient temperature tests for hoses and hose assemblies are given in ISO 4672, Rubber and plastics hoses Sub-ambient temperature flexibility tests to be replaced by ISO 10619-2 (in preparation). BS ISO 28702:2008I
17、NTERNATIONAL STANDARD ISO 28702:2008(E) ISO 2008 All rights reserved 1Rubber and plastics hoses and tubing Textile-reinforced types Sub-ambient temperature crush test 1 Scope This International Standard specifies a test method for measuring the low-temperature brittleness of rubber and plastics hose
18、s with a textile reinforcement and tubing at sub-ambient temperatures by crushing a test piece of the hose. This International Standard is only applicable to hoses with a nominal bore up to and including 100 mm. 2 Normative references The following referenced documents are indispensable for the appl
19、ication of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 23529, Rubber General procedures for preparing and conditioning test pieces for physical test methods 3 Princi
20、ple A hose test piece is compressed to 50 % of its inside diameter at the test temperature and, after decompression, is examined on the interior and exterior for the presence of any cracks or other abnormalities. 4 Apparatus 4.1 Compression jig or any other suitable apparatus, consisting of two flat
21、 plates large enough for the hose to be compressed to 50 % of its inside diameter. 4.2 Conditioning chamber, capable of being maintained at the specified temperature as selected in Clause 6. 5 Test piece Cut a ring test piece of length approximately 25 mm from the hose under test. BS ISO 28702:2008I
22、SO 28702:2008(E) 2 ISO 2008 All rights reserved6 Test temperature The test shall be conducted at one of the following temperatures or at another sub-ambient temperature as defined in the relevant product standard. 0 C 2 C; 10 C 2 C; 25 C 2 C; 40 C 2 C; 55 C 2 C. 7 Procedure Condition the test piece
23、and compression jig in the conditioning chamber at the test temperature for 24 h and then hold the test piece between the two plates of the compression jig at the test temperature for at least another 30 min before testing. Guidance on achieving the specified temperature is given in ISO 23529. After
24、 the specified conditioning periods, compress the test piece in the direction at right angles to the plates to 50 % of its inside diameter within a time of 5 s 2 s. An example of a compression jig is shown in Figure 1. The test may be carried out on any other suitable mechanical test equipment, howe
25、ver. In principle, the test shall be carried out in the conditioning chamber. If this is not feasible, remove the test piece from the chamber and perform the test within 15 s. After testing, leave the test piece to warm up to room temperature. 8 Examination of test piece after testing Examine the in
26、terior and exterior of test piece with a 2 magnifier. If any abnormalities such as cracks, fractures, or separation of layers are observed, record them. 9 Test report The test report shall include the following information: a) a reference to this International Standard (ISO 28702:2008); b) the type
27、of hose tested and its nominal bore; c) the test temperature; d) whether the test was carried out inside or outside the conditioning chamber; e) the results of the examination of the test piece after testing; f) the date of the test. BS ISO 28702:2008ISO 28702:2008(E) ISO 2008 All rights reserved 3a
28、) Example of a compression jig b) Before compression c) Under compression Key 1 compression jig 2 test piece d inside diameter of hose t hose wall thickness Figure 1 Crush method for compressing the hose test piece BS ISO 28702:2008ISO 28702:2008(E) ICS 23.040.70 Price based on 3 pages ISO 2008 All
29、rights reserved BS ISO 28702:2008This page has been intentionally left blank BS ISO28702:2008BSI GroupHeadquarters 389Chiswick High Road,London, W4 4AL, UKTel +44 (0)20 8996 9001Fax +44 (0)20 8996 - British Standards InstitutionBSI is the independent national body responsible for preparing BritishS
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