1、BS ISO 4081:2016Rubber hoses and tubing forcooling systems for internal-combustion engines SpecificationBSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS ISO 4081:2016 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 4081:2016.I
2、t supersedes BS ISO 4081:2010 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PRI/66, Rubber and plastics tubing, hoses and hoseassemblies.A list of organizations represented on this committee can beobtained on request to its secretary.This publication
3、does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2016.Published by BSI Standards Limited 2016ISBN 978 0 580 92844 4ICS 43.040.01; 83.140.40Compliance with a British Standard cannot confer immuni
4、ty fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 October 2016.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS ISO 4081:2016 ISO 2016Rubber hoses and tubing for cooling systems for interna
5、l-combustion engines SpecificationTubes et tuyaux en caoutchouc pour systmes de refroidissement pour moteurs combustion interne SpcificationsINTERNATIONAL STANDARDISO4081Fourth edition2016-10-15Reference numberISO 4081:2016(E)BS ISO 4081:2016ISO 4081:2016(E)ii ISO 2016 All rights reservedCOPYRIGHT P
6、ROTECTED DOCUMENT ISO 2016, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without p
7、rior 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 officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 4
8、081:2016ISO 4081:2016(E)Foreword iv1 Scope . 12 Normative references 13 Classification 24 Size and tolerances . 25 Performance requirements for hose and tubing 26 Frequency of testing 57 Marking 6Annex A (normative) Dilation test 7Annex B (normative) Resistance to surface contamination by engine oil
9、 . 8Annex C (normative) Pressure, vibration and temperature test . 9Annex D (informative) Example of how a non-standard type of hose or tubing could be specified by an original equipment manufacturer (OEM) using a matrix .11Annex E (normative) Type test 12Annex F (normative) Routine test 13Annex G (
10、informative) Production acceptance test 14Bibliography .15 ISO 2016 All rights reserved iiiContents PageBS ISO 4081:2016ISO 4081:2016(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing I
11、nternational 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-governmental, in liaison
12、 with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (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 Directi
13、ves, Part 1. In particular the different approval criteria needed for the different types of ISO documents should 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
14、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. 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 declarati
15、ons received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience 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
16、ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html.The committee responsible for this document is ISO/TC 45, Rubber and rubber products, Subcommittee SC 1, Rubber and plastics hoses and hose as
17、semblies.This fourth edition cancels and replaces the third edition (ISO 4081:2010), of which it constitutes a minor revision. The following change has been made: Clause 2 has been updated, where ISO 1746 and ISO 4672 have been deleted and replaced by ISO 10619-1 and ISO 10619-2, respectively.iv ISO
18、 2016 All rights reservedBS ISO 4081:2016INTERNATIONAL STANDARD ISO 4081:2016(E)Rubber hoses and tubing for cooling systems for internal-combustion engines SpecificationWARNING Persons using this International Standard should be familiar with normal laboratory practice. This International Standard d
19、oes not purport to address all 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 ScopeThis International Standard specifies the requirem
20、ents for straight or pre-formed rubber hoses and tubing for use in pressurized or unpressurized cooling circuits containing 1,2-ethanediol-based coolants in internal-combustion engines for vehicles with an unladen mass (as defined in ISO 1176) of 3,5 t or less. In addition, this specification may al
21、so be applied as a classification system to enable original equipment manufacturers (OEMs) to detail a “line call-out” of tests for specific applications where these are not covered by the main types specified (see example in Annex D). In this case, the hose or tubing would not carry any marking sho
22、wing this ISO specification number but may detail the OEMs own identification markings as shown on their part drawings.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only
23、 the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 188, Rubber, vulcanized or thermoplastic Accelerated ageing and heat resistance testsISO 1307, Rubber and plastics hoses Hose sizes, minimum and maximum inside dia
24、meters, and tolerances on cut-to-length hosesISO 1402, Rubber and plastics hoses and hose assemblies Hydrostatic testingISO 1629, Rubber and latices NomenclatureISO 1817, Rubber, vulcanized or thermoplastic Determination of the effect of liquidsISO 6162-1, Hydraulic fluid power Flange connections wi
25、th split or one-piece flange clamps and metric or inch screws Part 1: Flange connectors, ports and mounting surfaces for use at pressures of 3,5 MPa (35 bar) to 35 MPa (350 bar), DN 13 to DN 127ISO 7233, Rubber and plastics hoses and hose assemblies Determination of resistance to vacuumISO 7326:2016
26、, Rubber and plastics hoses Assessment of ozone resistance under static conditionsISO 8033, Rubber and plastics hoses Determination of adhesion between componentsISO 10619-1:2011, Rubber and plastics hoses and tubing Measurement of flexibility and stiffness Part 1: Bending tests at ambient temperatu
27、reISO 10619-2:2011, Rubber and plastics hoses and tubing Measurement of flexibility and stiffness Part 2: Bending tests at sub-ambient temperatures ISO 23529, Rubber General procedures for preparing and conditioning test pieces for physical test methodsSAE J20:2006, Coolant system hoses ISO 2016 All
28、 rights reserved 1BS ISO 4081:2016ISO 4081:2016(E)SAE J1638, Compression set of hoses or solid discsSAE J1684:2005, Test method for evaluating the electrochemical resistance of coolant system hoses and materials3 ClassificationThe product shall consist of rubber materials with or without an integral
29、 reinforcement which may or may not be pre-formed before final vulcanization. The hoses and tubing may be branched, in which case the method of attachment of the branch shall be such that the integrity of the hose is maintained when it is tested to this International Standard. This International Sta
30、ndard does not cover methods of attachment to mounting spigots.Four types of hose and tubing for specific applications are specified as follows: Type 1 = Tubing and hoses for ambient operating temperatures from 40 C to +100 C; Type 2 = Tubing and hoses for ambient operating temperatures from 40 C to
31、 +125 C; Type 3 = Tubing and hoses for ambient operating temperatures from 40 C to +150 C; Type 4 = Tubing and hoses for ambient operating temperatures from 40 C to +175 C.Wherever economically and technically possible, hoses and tubing shall use in their construction materials that are capable of b
32、eing recycled. Also, wherever economically and technically possible, hoses and tubing shall use in their construction materials that contain post-consumer or post-industrial recyclates.4 Size and tolerancesBore sizes and tolerances shall be in accordance with ISO 1307. Wall thicknesses shall be suff
33、icient to meet the requirements of this International Standard.5 Performance requirements for hose and tubingTests shall be selected from the following list for each application of hose or tubing, based on the performance requirements of the finished product. Type tests (as defined in Clause 6) for
34、each hose or tubing type are given in Annex E.a) Burst pressureWhen determined in accordance with ISO 1402 at standard laboratory temperature as specified in ISO 23529, the minimum burst pressure shall be:Tubing: 0,2 MPa (2 bar) for all diametersHose: 1,2 MPa (12 bar) for diameters up to and includi
35、ng 18 mm0,9 MPa (9 bar) for diameters 18 mm up to, and including, 35 mm0,5 MPa (5 bar) for diameters 35 mmb) Adhesion (for all constructions with two or more bonded layers only)When determined by the appropriate procedure of ISO 8033, the adhesion between each pair of bonded layers shall not be less
36、 than 1,8 kN/m for unaged hoses and not less than 1,3 kN/m for 2 ISO 2016 All rights reservedBS ISO 4081:2016ISO 4081:2016(E)hoses aged as specified in test i), immersed in oil as specified in test k) and fatigued by vibration as specified in test l).c) Low-temperature flexibility For hoses and tubi
37、ng of 25 mm inside diameter and below, with a minimum free straight-length section of 300 mmWhen cooled to 40 C 2 C for 5 h 0,5 h and tested in accordance with method B of ISO 10619-2:2011, the hose or tubing shall not exhibit any cracking when examined under 2 magnification after bending within 4 s
38、 around a similarly cooled mandrel, the radius of which is 10 the maximum outside diameter of the hose or tubing. The hose or tubing shall then conform to the burst strength requirement of test a). For hoses and tubing of 25 mm inside diameter, with a minimum free straight-length section of 300 mmWh
39、en tested in accordance with SAE J20:2006, 5.1.2, hose or tubing shall not exhibit any cracking when examined under 2 magnification. The hose or tubing shall then conform to the burst strength requirement of test a).d) Resistance to collapse For hoses 16 mm but 25 mm inside diameterWhen the hose or
40、tubing is tested in accordance with ISO 7233 at 0,03 MPa (0,3 bar) absolute at 100 C for 10 min, the outside diameter shall not collapse by more than 30 %.The change in outside diameter, D, is given by Formula (1):DDDD=211100 (1)whereD is the change in outside diameter (%);D1is the outside diameter
41、at the initial pressure (mm);D2is the outside diameter at the specified pressure (mm).e) Resistance to kinking (for straight hoses or tubing with bore sizes of 19,5 mm or less only)When determined in accordance with method B of ISO 10619-1:2011, the maximum coefficient of deformation (T/D) shall exc
42、eed 0,7. The mandrel sizes to be used are 140 mm for hoses and tubing with bore sizes of 10,5 mm or less, 220 mm for hoses and tubing with bore sizes over 10,5 mm up to 16,5 mm, and 300 mm for hoses and tubing with bore sizes over 16,5 mm up to 19,5 mm. ISO 2016 All rights reserved 3BS ISO 4081:2016
43、ISO 4081:2016(E)f) Resistance to dilation (for hoses only)When determined in accordance with Annex A, the dilation shall not exceed 12 %.The dilation, D, is given by using either the change in the outside circumference or the change in diameter as shown in Formulae (2) and (3).The change in the outs
44、ide circumference:DCCC=100100 (2)whereD is the dilation in terms of the change in circumference (%);C0is the outside circumference at the initial condition (mm);C1is the outside circumference at the specified pressure (mm).The change in diameter:DDDD=100100 (3)whereD is the dilation in terms of the
45、change in outside diameter (%);D0is the sum of two diameters measured at right angles to each other at the initial condi-tion (mm);D1is the sum of two diameters measured at right angles to each other at the specified pres-sure (mm).g) Resistance to electrochemical degradationWhen tested in accordanc
46、e with method 1 of SAE J1684:2005, hoses and tubing shall not exhibit any internal cracks or “striations”.h) Resistance to ozoneWhen tested in accordance with method 2 of ISO 7326:2016 under the following conditions, the hose or tubing shall not show cracking when examined under 2 magnification:Part
47、ial pressure of ozone: 50 mPa 3 mPaDuration: 72 h 2 hTemperature: 40 C 2 CElongation: 20 %4 ISO 2016 All rights reservedBS ISO 4081:2016ISO 4081:2016(E)i) Heat ageing resistanceAfter ageing for 1 000 h 5 h at 100 C for type 1, 125 C for type 2, 150 C for type 3 or 175 C for type 4 hose or tubing in
48、accordance with ISO 188, all constructions shall meet the adhesion requirements of test b), the low-temperature flexibility requirements of test c) and the ozone resistance requirements of test h).j) Compression setWhen determined in accordance with SAE J1638 for 24 h 2 h at 100 C for type 1, 125 C
49、for type 2, 150 C for type 3 or 175 C for type 4 hose or tubing, the compression set of all types of hose and tubing shall not exceed 50 %.k) Resistance to surface contamination by engine oilWhen tested in accordance with Annex B using ISO 1817 oil 3, all constructions shall meet the adhesion requirements of test b), the low-temperature flexibility c) and the resistance to ozone h).l) Pressure/vibration/temperature testWhen tested in accordance with Annex
