1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-22954-2 SANS 7619-2:2009Edition 1ISO 7619-2:2004Edition 1SOUTH AFRICAN NATIONAL STANDARD Rubber, vulcanized or thermoplastic Determination
4、 of indentation hardness Part 2: IRHD pocket meter method This national standard is the identical implementation of ISO 7619-2:2004 and is adopted with the permission of the International Organization for Standardization. Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag
5、X191 Pretoria 0001Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS SANS 7619-2:2009 Edition 1 ISO 7619-2:2004 Edition 1 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Committee SABS TC 45, Rubber and rubber products, in acco
6、rdance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This SANS document was published in October 2009. Reference numberISO 7619-2:2004(E)ISO 2004INTERNATIONAL STANDARD ISO7619-2First edition2004-05-15Rubber, vulcanized or thermoplastic Determina
7、tion 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 IRHD SANS 7619-2:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the S
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11、ress given below. ISO 2004 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 ISO
12、s 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-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2004 All rights reservedSANS 7619-2:2009This s tandard may only be used and print
13、ed by approved subscription and freemailing clients of the SABS .ISO 7619-2:2004(E) ISO 2004 All rights reserved iiiContents Page Foreword iv Introduction v 1 Scope 1 2 Normative references . 1 3 Principle . 1 4 Apparatus 1 5 Test piece. 2 6 Conditioning 3 7 Procedure 3 8 Calibration and checking .
14、3 9 Test report . 4 Bibliography . 5 SANS 7619-2:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 7619-2:2004(E) iv ISO 2004 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation
15、 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 to be represented on that committee.
16、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 Standards are drafted in accordance wit
17、h 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 International Standard requires approv
18、al 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 7619-2 was prepared by Technical Committ
19、ee ISO/TC 45, Rubber and rubber products, Subcommittee SC 2, Testing and analyses. This first edition of ISO 7619-2, together with ISO 7619-1, cancels and replaces ISO 7619:1997, which has been technically revised as follows in respect of the IRHD pocket meter now covered exclusively by Part 2: a te
20、st time of 3 s replaces the formerly specified “within 1 s”, giving a more accurate value, as the hardness value drops significantly during the first few seconds; a test time of 15 s has been introduced for TPE materials, as the hardness value continues to decrease over a longer period of time than
21、for vulcanized rubber, this test time being the same as that specified for plastic in ISO 868 1; ISO 7619 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
22、meter method SANS 7619-2:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 7619-2:2004(E) ISO 2004 All rights reserved vIntroduction The hardness of rubber, as measured by the IRHD pocket meter or the durometer, is a complex response to
23、 an applied indentation. The measurement will depend upon a) the elastic modulus 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, and g) the interval at whic
24、h the hardness is recorded. Because of these factors, it is inadvisable to relate results using an IRHD pocket meter directly to durometer hardness values, although correlations have been established for some individual rubbers or compounds. NOTE Further information on the relation between the durom
25、eter values and IRHD values is given in the literature 4, 5, 6. SANS 7619-2:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .SANS 7619-2:2009This s tandard may only be used and printed by approved subscription and freemailing clients of th
26、e SABS .INTERNATIONAL STANDARD ISO 7619-2:2004(E) ISO 2004 All rights reserved 1Rubber, vulcanized or thermoplastic Determination of indentation hardness Part 2: IRHD pocket meter method 1 Scope This part of ISO 7619 specifies a method for determining the indentation hardness of vulcanized or thermo
27、plastic 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 precision by fixing the pocket hardness meter on a support. 2 Normative references
28、The following referenced documents are indispensable for the application of this document. For dated references only the edition cited apply. For undated references, the latest edition of the referenced document ISO 48:1994, Rubber, vulcanized or thermoplastic Determination of hardness (hardness bet
29、ween 10 IRHD and 100 IRHD) ISO 23529, Physical test methods Preparation and conditioning of test pieces and preferred test conditions1)3 Principle The measured property is the penetration of a specified indentor forced into the material under specified conditions. 4 Apparatus 4.1 IRHD pocket hardnes
30、s meter The hardness meter calibrated in IRHD consists of the components specified in 4.1.1 to 4.1.4. 4.1.1 Pressure foot The pressure foot shall be square with sides 20 mm 2,5 mm and having a centre hole of diameter 2,5 mm 0,5 mm (see Figure 1). 1)To be published. (Revision of ISO 471:1995)SANS 761
31、9-2:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 7619-2:2004(E) 2 ISO 2004 All rights reservedDimensions in millimetres Key 1 hemispherical (diameter 1,575 mm 0,025 mm) aValid at 30 IRHD. Figure 1 Indentor for IRHD pocket meter 4.1
32、.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 terms of IRHD from the val
33、ue 30 for 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 piece of glass. 4.1.4 Calibrated spring This shall be used to apply a substantially constant force to the indentor of 2,65 0,15 N over the 30 IR
34、HD to 100 IRHD range. 5 Test piece 5.1 Thickness For the determination of hardness by pocket hardness meters, the thickness of the test piece shall be at least 6 mm. For sheets thinner than 6 mm, a test piece may be composed of not more than three layers, none of which shall be thinner than 2 mm, in
35、 order to obtain the necessary thickness. However, determinations made on such test pieces may not agree with those made on single-thickness pieces. For comparison purposes, the test pieces shall be similar. SANS 7619-2:2009This s tandard may only be used and printed by approved subscription and fre
36、emailing clients of the SABS .ISO 7619-2:2004(E) ISO 2004 All rights reserved 35.2 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 with the pressure foot.
37、 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 7267-12for determination of hardness of rubber-covered rolls. In such applications, the limitations of their u
38、se shall be clearly identified. 6 Conditioning Where practical, test pieces shall be conditioned immediately before testing for a minimum period of 1 h at the standard laboratory temperature in accordance with ISO 471. The same temperature shall be used throughout any single test or series of tests
39、intended to be comparable. 7 Procedure 7.1 General procedure Place the test piece on a flat, hard, rigid surface. 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 pressure foot to the test piece as rapidly as possible, wit
40、hout 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 piece and take the reading at the specified time after the
41、pressure foot is in firm contact with the test piece. The standard test time shall be 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 type should be treated as vulcanized. 7.3 Number of measure
42、ments Make five measurements of hardness at different positions on the test piece at least 6 mm apart and determine the median value. 8 Calibration and checking 8.1 Calibration The instrument shall be adjusted and calibrated regularly using suitable instruments for measuring force and dimensions. NO
43、TE An International Standard for calibration of hardness meters and durometers, ISO 18898, is under preparation 3. SANS 7619-2:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 7619-2:2004(E) 4 ISO 2004 All rights reserved8.2 Checking u
44、sing standard rubber blocks Press the instrument against a flat piece of glass and adjust the reading on the scale to give 100 IRHD. Using a set of standard rubber blocks2)covering the range approx. 30 IRHD to 90 IRHD, calibrate the instrument. All adjustments shall be made according to the manufact
45、urers 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 themselves be calibrated against the dead-load gauge by the method specifie
46、d in ISO 48 at intervals not exceeding 6 months. Instruments in regular use should be checked at least weekly against standard rubber blocks. 9 Test report The test report shall include the following information: a) reference to this international Standard: b) sample details full description of the
47、sample and its origin, compound details and curing conditions, if known, description of the test piece, including its thickness and, in the case of a composite test piece, the number of layers; c) test details temperature of test, and the relative humidity when the hardness of the material is depend
48、ent on the humidity, type of instrument used, time which elapsed between the preparation of the test piece and the measurement of hardness, any deviation from the standard procedure, details of procedure not specified in this International Standard, and any incidents likely to have had an influence
49、on the results; d) test results individual values of the indentation hardness and the time interval after which each reading was taken, if different from 3 s, plus the median value and the maximum and minimum values; e) date of test. 2) Standard rubber blocks are available from different manufacturers of hardness testers. SANS 7619-2:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 7619-2:2004(E) ISO 2004 A
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