1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 4195:2012Conveyor belts with heat-resistant rubber covers Heat resistance of covers Requirements and testmethodsBS ISO 4195:2012 BRITISH STANDARDNational forewordThis Brit
2、ish Standard is the UK implementation of ISO 4195:2012. Itsupersedes BS ISO 4195:2007 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PRI/67, Conveyor belts.A list of organizations represented on this committee can beobtained on request to its secretary
3、.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2012. Published by BSI StandardsLimited 2012ISBN 978 0 580 77354 9ICS 53.040.20Compliance with a British Standard cannot confer
4、 immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 November 2012.Amendments issued since publicationDate Text affectedBS ISO 4195:2012 ISO 2012Conveyor belts with heat-resistant rubber covers Heat resistance of
5、covers Requirements and test methodsCourroies transporteuses avec revtements caoutchouc rsistant la chaleur Rsistance la chaleur des revtements Exigences et mthodes dessaiINTERNATIONAL STANDARDISO4195Second edition2012-11-01Reference numberISO 4195:2012(E)BS ISO 4195:2012ISO 4195:2012(E)ii ISO 2012
6、All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2012All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either IS
7、O at the address below or ISOs member body in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 4195:2012ISO 4195:2012(E) ISO 2012 All rights reserved iiiCo
8、ntents PageForeword iv1 Scope . 12 Normative references 13 Performance requirements . 14 Test method . 24.1 Principle 24.2 Classification . 24.3 Procedure 24.4 Expression of results 45 Test report . 4Bibliography 5BS ISO 4195:2012ISO 4195:2012(E)ForewordISO (the International Organization for Standa
9、rdization) 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 has the right t
10、o 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.International Stan
11、dards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 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 Inte
12、rnational 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 document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.ISO 4195 was
13、 prepared by Technical Committee ISO/TC 41, Pulleys and belts (including veebelts), Subcommittee SC 3, Conveyor belts.This second edition cancels and replaces the first edition (ISO 4195:2007), of which it constitutes a minor revision. It also incorporates ISO 4195:2007/Cor 1:2008.iv ISO 2012 All ri
14、ghts reservedBS ISO 4195:2012INTERNATIONAL STANDARD ISO 4195:2012(E)Conveyor belts with heat-resistant rubber covers Heat resistance of covers Requirements and test methods1 ScopeThis International Standard specifies requirements and test methods for the relative level of heat resistance of conveyor
15、 belt covers made of rubber. It gives the permissible variations of hardness, elongation at break and tensile strength after exposure to heat. It is applicable only to those conveyor belts having a cover thickness greater than or equal to 4 mm. It is not suitable or valid for light conveyor belts as
16、 described in ISO 21183-11.2 Normative referencesThe following referenced documents are indispensable for the application 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.I
17、SO 37, Rubber, vulcanized or thermoplastic Determination of tensile stress-strain propertiesISO 48, Rubber, vulcanized or thermoplastic Determination of hardness (hardness between 10 IRHD and 100 IRHD)ISO 188, Rubber, vulcanized or thermoplastic Accelerated ageing and heat resistance testsISO 18573,
18、 Conveyor belts Test atmospheres and conditioning periodsISO 23529, Rubber General procedures for preparing and conditioning test pieces for physical test methods3 Performance requirementsWhen tested in accordance with the method specified in Clause 4, the permissible variations in hardness, elongat
19、ion at break and tensile strength shall be in accordance with Table 1.Table 1 Permissible variationsCover characteristicVariation for belt class1 2 3Hardness (IRHD) variation of initial value maximum value+ 20 85+ 20 85+ 20 85Elongation at break (%) variation in percentage of initial value minimum v
20、alue 50 200 50 200 55 180Tensile strength (N/mm2) variation in percentage of initial value minimum value 25 12 30 10 40 5 ISO 2012 All rights reserved 1BS ISO 4195:2012ISO 4195:2012(E)4 Test method4.1 PrincipleThe following properties are measured, before and after exposure to heat according to 4.3.
21、1: hardness of covers in accordance with ISO 48; elongation at break of covers in accordance with ISO 37; tensile strength of covers in accordance with ISO 37.NOTE The temperatures selected for the tests are usually not those corresponding to the temperature of the product to be transported; they ar
22、e generally lower to take account of: the possibility of the conveyor belt cooling, and the fact that contact between the product and the conveyor belt will not equalize the temperature.4.2 ClassificationConveyor belts shall be classified as follows: Class 1: resistant to test temperatures of up to
23、100 C. Class 2: resistant to test temperatures of up to 125 C. Class 3: resistant to test temperatures of up to 150 C.These classes do not correspond to the temperature of the transported product as mentioned in the Note to 4.1. Depending on the use for which the belt is intended, the manufacturer s
24、hould state the class to be used for assessing compliance with this International Standard.4.3 Procedure4.3.1 Exposure to heatCut a sample of belt of full thickness measuring 400 mm 400 mm from the centre of the belt at a distance of at least 100 mm from the edges. Place it in an air oven in accorda
25、nce with ISO 188 for 7 days at a temperature of 100 C for class 1 belts, 125 C for class 2 belts or 150 C for class 3 belts.After exposure to heat, remove the belt sample from the oven and leave it to cool.4.3.2 Preparation of test pieces for evaluating properties4.3.2.1 Test pieces for measuring ha
26、rdness of coversThe test pieces shall either be the belt sample itself or covers removed from the belt by cutting away the covers from the belt sample. Test pieces shall be lightly buffed on each surface but left at maximum thickness. Condition the test pieces for 24 h at a temperature of (23 2) C a
27、nd a relative humidity of (50 5) % (atmosphere B in accordance with ISO 18573).4.3.2.2 Test pieces for measuring elongation at break and tensile strengthCut away the covers from the belt samples treated as described in 4.3.1 and bring them to a thickness of (2 0,2) mm by cutting on both faces and fi
28、nishing off by a light buffing. Condition the test pieces for 24 h at a temperature of (23 2) C and a relative humidity of (50 5) % (atmosphere B in accordance with ISO 18573).2 ISO 2012 All rights reservedBS ISO 4195:2012ISO 4195:2012(E)For belts with a textile carcass, the test results of which ca
29、n be affected by the humidity, a temperature of (20 2) C and a relative humidity of (65 5) % (atmosphere A in accordance with ISO 18573) may be selected, by agreement between the parties concerned, provided that this is clearly indicated in the test report.In the special case of tropical conditions,
30、 reference should be made to ISO 23529 temperature (27 2) C and relative humidity (65 5) %, atmosphere C in accordance with ISO 18573.4.3.3 Determination of properties4.3.3.1 HardnessUsing the test pieces prepared as described in 4.3.2.1, measure the hardness of covers using one of the methods speci
31、fied in ISO 48, according to the available thickness of the rubber material.4.3.3.2 Elongation at break and tensile strengthUsing the test pieces as described in 4.3.2.2, measure the elongation at break of covers and tensile strength in accordance with ISO 37.4.3.3.3 Initial valuesDetermine the init
32、ial values of hardness, elongation at break and tensile strength by measuring these properties using test pieces cut from the same belt and prepared as described in 4.3.2, but without exposure to heat.NOTE Users of this International Standard need to be aware of the limitations of the results obtain
33、ed in that two measurements do not provide a complete picture of the rate of change of the measured properties with time. The two points obtained do not allow the path of the curve relating the measured properties to time to be determined. Figure 1 illustrates this in that the curve between the two
34、points shown could follow any number of paths; although for the purposes of illustration, three possible paths, A, B and C, are shown. ISO 2012 All rights reserved 3BS ISO 4195:2012ISO 4195:2012(E)KeyX timeY measured propertyFigure 1 Changes in measured properties with time4.4 Expression of resultsR
35、ecord the results for the hardness of covers, the elongation at break of covers and the tensile strength of covers for the samples not exposed to heat and those exposed to heat. Calculate the variation in hardness, elongation at break and breaking strength between the results obtained for the sample
36、s not exposed to heat and those obtained for the samples exposed to heat.5 Test reportThe test report shall contain the following information:a) reference to this International Standard (i.e. ISO 4195);b) identification of the conveyor belt tested;c) the belt class as given in 4.2;d) the test piece
37、used (see 4.3.2);e) the conditions of exposure to heat;f) details of the conditioning used;g) the results of the test as described in 4.4;h) date of the test.4 ISO 2012 All rights reservedBS ISO 4195:2012ISO 4195:2012(E)Bibliography1 ISO 21183-1, Light conveyor belts Part 1: Principal characteristic
38、s and applications ISO 2012 All rights reserved 5BS ISO 4195:2012ISO 4195:2012(E) ISO 2012 All rights reservedICS 53.040.20Price based on 5 pagesThis page deliberately left blankBSI is the independent national body responsible for preparing British Standards and other standards-related publications,
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