1、raising standards worldwide NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BSI Standards Publication BS ISO 7619-2:2010 Rubber, vulcanized or thermoplastic Determination of indentation hardness Part 2: IRHD pocket meter methodBS ISO 7619-2:2010 BRITISH STANDARD National forew
2、ord This British Standard is the UK implementation of ISO 7619-2:2010. It supersedes BS ISO 7619-2:2004 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee PRI/22, Physical testing of rubber. A list of organizations represented on this committee can be ob
3、tained 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. BSI 2010 ISBN 978 0 580 65432 9 ICS 83.060 Compliance with a British Standard cannot confer immunity from legal obligations.
4、 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 October 2010. Amendments issued since publication Date Text affectedBS ISO 7619-2:2010Reference number ISO 7619-2:2010(E) ISO 2010INTERNATIONAL STANDARD ISO 7619-2 Second edition 2010-10-01
5、Rubber, vulcanized or thermoplastic Determination of indentation hardness Part 2: IRHD pocket meter method Caoutchouc vulcanis ou thermoplastique Dtermination de la duret par pntration Partie 2: Mthode au duromtre de poche talonn en DIDC BS ISO 7619-2:2010 ISO 7619-2:2010(E) PDF disclaimer This PDF
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9、SO 2010 All 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 ISO at the address below or ISOs member body in th
10、e 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-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2010 All rights reservedBS ISO 7619-2:2010 ISO 7619-2:2010(E) ISO 2010 All rights reserved iiiConten
11、ts Page Foreword iv Introduction.v 1 Scope1 2 Normative references1 3 Principle1 4 Apparatus.2 4.1 IRHD pocket hardness meter .2 5 Test pieces .2 5.1 General .2 5.2 Thickness .3 5.3 Surface3 6 Conditioning and test temperature3 7 Procedure.3 7.1 General .3 7.2 Test time.3 7.3 Number of measurements
12、3 8 Calibration and checking4 8.1 Calibration4 8.2 Checking using standard rubber blocks.4 9 Test report4 Bibliography5 BS ISO 7619-2:2010 ISO 7619-2:2010(E) iv ISO 2010 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standar
13、ds 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 to be represented on that committee. International organi
14、zations, 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 Standards are drafted in accordance with the rules given in
15、 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 International Standard requires approval by at least 75 %
16、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 7619-2 was prepared by Technical Committee ISO/TC 45, Rubber
17、 and rubber products, Subcommittee SC 2, Testing and analysis. This second edition cancels and replaces the first edition (ISO 7619-2:2004), which has been technically revised to update the references to ISO 18898 for instrument calibration and ISO 23529 for the preparation of test pieces. ISO 7619
18、consists of the following parts, under the general title Rubber, vulcanized or thermoplastic Determination of indentation hardness: Part 1: Durometer method (Shore hardness) Part 2: IRHD pocket meter method BS ISO 7619-2:2010 ISO 7619-2:2010(E) ISO 2010 All rights reserved vIntroduction The hardness
19、 of rubber, as measured by an IRHD pocket meter or a Shore durometer, is determined from the complex response of the rubber to an applied indentation. An IRHD pocket meter is a portable hand-held durometer calibrated to measure on the IRHD scale. The measurement will depend upon: a) the elastic modu
20、lus of the rubber; b) the viscoelastic properties of the rubber; c) the thickness of the test piece; d) the geometry of the indentor; e) the pressure exerted; f) the rate of increase of pressure; g) the interval after which the hardness is recorded. Because of these factors, it is inadvisable to rel
21、ate results obtained using an IRHD pocket meter directly to Shore durometer hardness values, although correlations have been established for some individual rubbers and compounds. NOTE Further information on the relationship between the durometer values and IRHD values is given in the literature 345
22、 . BS ISO 7619-2:2010BS ISO 7619-2:2010 INTERNATIONAL STANDARD ISO 7619-2:2010(E) ISO 2010 All rights reserved 1Rubber, vulcanized or thermoplastic Determination of indentation hardness Part 2: IRHD pocket meter method WARNING Persons using this part of ISO 7619 should be familiar with normal labora
23、tory practice. This part of ISO 7619 does 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. CAUTION Certain pr
24、ocedures specified in this part of ISO 7619 may involve the use or generation of substances, or the generation of waste, that could constitute a local environmental hazard. Reference should be made to appropriate documentation on safe handling and disposal after use. 1 Scope This part of ISO 7619 sp
25、ecifies a method for determining the indentation hardness of vulcanized or thermoplastic rubber by means of a pocket hardness meter calibrated in IRHD. The use of such meters is primarily intended for control, not specification, purposes (for specification, see ISO 48). It is possible to increase pr
26、ecision by fixing the pocket hardness meter on a support. 2 Normative references The 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 (incl
27、uding any amendments) applies. ISO 48, Rubber, vulcanized or thermoplastic Determination of hardness (hardness between 10 IRHD and 100 IRHD) ISO 18898, Rubber Calibration and verification of hardness testers ISO 23529, Rubber General procedures for preparing and conditioning test pieces for physical
28、 test methods 3 Principle The measured property is the depth of penetration of a specified indentor forced into the material under specified conditions. BS ISO 7619-2:2010 ISO 7619-2:2010(E) 2 ISO 2010 All rights reserved4 Apparatus 4.1 IRHD pocket hardness meter 4.1.1 Pressure foot The pressure foo
29、t (see A in Figure 1) shall be square with sides 20 mm 2,5 mm long or circular with a diameter of 22,5 mm 2,5 mm. It shall have a central hole of diameter 2,5 mm 0,5 mm (see Figure 1). Dimensions in millimetres Key 1 hemispherical (diameter 1,575 mm 0,025 mm) aValid at 30 IRHD. Figure 1 Indentor for
30、 IRHD pocket meter 4.1.2 Indentor The indentor end shall be hemispherical, with a diameter of 1,575 mm 0,025 mm (see Figure 1). 4.1.3 Indicating device This device allows the extent of protrusion of the indentor beyond the face of the pressure foot to be read. It shall be calibrated directly in term
31、s of IRHD from the value 30 for the maximum protrusion of 1,65 mm to the value 100 for zero protrusion obtained by placing the pressure foot and indentor in firm contact with a flat and hard surface (e.g. glass). 4.1.4 Calibrated spring This shall be used to apply a substantially constant force to t
32、he indentor of 2,65 N 0,15 N over the 30 IRHD to 100 IRHD range. 5 Test pieces 5.1 General Test pieces shall be prepared in accordance with ISO 23529. BS ISO 7619-2:2010 ISO 7619-2:2010(E) ISO 2010 All rights reserved 35.2 Thickness For the determination of hardness by pocket hardness meters, the th
33、ickness of the test piece shall be at least 6 mm. For sheets thinner than 6 mm, the test piece may be composed of not more than three layers, none of which shall be thinner than 2 mm, in order to obtain the necessary thickness. However, determinations made on such test pieces might not agree with th
34、ose made on single-thickness pieces. For comparative-test purposes, the test pieces shall be similar. 5.3 Surface The other dimensions of the test piece shall be sufficient to permit measurements at least 12 mm away from any edge. The surface of the test piece shall be flat over the area in contact
35、with the pressure foot. Satisfactory hardness determinations cannot be made on rounded, uneven or rough surfaces using pocket meters. However, their use in certain specialized applications is recognized, e.g. ISO 7267-1 2for the determination of the hardness of rubber-covered rolls. In such applicat
36、ions, the limitations to their use shall be clearly identified. 6 Conditioning and test temperature Where practical, test pieces shall be conditioned immediately before testing for a minimum period of 1 h at one of the standard laboratory temperatures specified in ISO 23529. The same temperature sha
37、ll be used throughout any single test or series of tests intended to be comparable. 7 Procedure 7.1 General Place the test piece on a flat, hard, rigid surface (e.g. glass). Hold the hardness meter in position with the centre of the indentor at least 12 mm from the edges of the test piece. Apply the
38、 pressure foot to the test piece as rapidly as possible, without shock, keeping the foot parallel to the surface of the test piece and ensuring that the indentor is normal to the rubber surface. 7.2 Test time Apply a force sufficient only to obtain firm contact between the pressure foot and the test
39、 piece and take the reading at the specified time after the pressure foot is in firm contact with the test piece. The standard test time is 3 s for vulcanized rubber and 15 s for thermoplastic rubber. Other test times may be used, provided they are stated in the test report. Rubbers of unknown types
40、 shall be treated as vulcanized. NOTE A test time of 15 s has been introduced for thermoplastic rubber, as the hardness value continues to decrease over a longer period of time than for vulcanized rubber, this test time being the same as that specified for plastics in ISO 868 1 . 7.3 Number of measu
41、rements Make five measurements of hardness at different positions on the test piece at least 6 mm apart and determine the median value. If the time interval after which each reading was taken is different from 3 s, record the individual values of the indentation hardness together with the time inter
42、val after which each reading was taken, and determine the median value and the maximum and minimum values obtained. BS ISO 7619-2:2010 ISO 7619-2:2010(E) 4 ISO 2010 All rights reserved8 Calibration and checking 8.1 Calibration The instrument shall be adjusted and calibrated in accordance with ISO 18
43、898. 8.2 Checking using standard rubber blocks 1)Press the instrument against a suitable flat, hard surface (e.g. glass) and adjust the reading on the scale to give a value of 100 IRHD. Continue the instrument check using a set of standard rubber blocks covering the measurement range from about 30 I
44、RHD to 90 IRHD. All adjustments shall be made in accordance with the manufacturers instructions. The set of standard rubber blocks shall consist of at least six test pieces kept lightly dusted with talc in a suitable covered container away from light, heat, oil and grease. The standard rubbers shall
45、 themselves be calibrated against the dead-load gauge by the method specified in ISO 48 at intervals not exceeding 1 year or when a drift in excess of 1 unit is observed. Instruments in regular use should be checked at least each week against standard rubber blocks. 9 Test report The test report sha
46、ll include the following information: a) sample details: 1) a full description of the sample and its origin, 2) a description of the test piece, including its thickness and, in the case of a composite test piece, the number of layers; b) the test method used, i.e. the reference number of this part o
47、f ISO 7619; c) test details: 1) the temperature of the test, and the relative humidity when the hardness of the material is dependent on the humidity, 2) the type of instrument used, 3) the time which elapsed between the preparation of the test piece and the measurement of its hardness, 4) details o
48、f any deviation from the standard procedure, 5) details of any operations not specified in this part of ISO 7619 and any incidents likely to have had an influence on the results; d) the test result, expressed as a whole number, e.g. 75 IRHD; e) the date of the test. 1) Standard rubber hardness block
49、s are available from a number of instrument manufacturers and accredited test laboratories. BS ISO 7619-2:2010 ISO 7619-2:2010(E) ISO 2010 All rights reserved 5Bibliography 1 ISO 868, Plastics and ebonite Determination of indentation hardness by means of a durometer (Shore hardness) 2 ISO 7267-1, Rubber-covered rollers Determination of apparent hardness Part 1: IRHD method 3 BROWN, R.P., Physical testing of rubber, Chapman and Hall, London, 2006 4 OBERTO, S., Rubber Ch
