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1、BRITISH STANDARD BS ISO 7619-2:2004 Rubber, vulcanized or thermoplastic Determination of indentation hardness Part 2: IRHD pocket meter method ICS 83.060 ? Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 07:43:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 7619-2:2004 This British Stand
2、ard was published under the authority of the Standards Policy and Strategy Committee on 7 November 2005 BSI 7 November 2005 ISBN 0 580 46735 X National foreword This British Standard reproduces verbatim ISO 7619-2:2004 and implements it as the UK national standard. Together with BS ISO 7619-1:2004 t
3、his publication supersedes BS 903-A57:1997, which is withdrawn The UK participation in its preparation was entrusted to Technical Committee PRI/22, Physical testing of rubber, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European com
4、mittee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-referen
5、ces The British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Standards Electronic Catalogue or of British Sta
6、ndards Online. This publication does not purport to include all the necessary provisions of a contract. Users are reponsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cov
7、er, an inside front cover, the ISO title page, pages ii to v, a blank page, pages 1 to 5 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun,
8、na, Mon Nov 27 07:43:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Reference number ISO 7619-2:2004(E) INTERNATIONAL STANDARD ISO 7619-2 First edition 2004-05-15 Rubber, vulcanized or thermoplastic Determination of indentation hardness Part 2: IRHD pocket meter method Caoutchouc vulcanis ou thermopl
9、astique Dtermination de la duret par pntration Partie 2: Mthode au duromtre de poche IRHD BS ISO 7619-2:2004 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 07:43:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 07:43:30 GMT+00:00 2006, U
10、ncontrolled Copy, (c) BSI iii Contents Page Forewordiv 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 . 3 9 Test report . 4 Bibliography . 5 BS ISO 7619-2:2004 Licensed Copy: sheffieldun sheff
11、ieldun, na, Mon Nov 27 07:43:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through IS
12、O 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 with ISO, also take part in the work. ISO collaborates c
13、losely 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 2. The main task of technical committees is to prepare International Standards. D
14、raft 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 a vote. Attention is drawn to the possibility that some of the elements of this do
15、cument 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 and rubber products, Subcommittee SC 2, Testing and analyses. This first edition of ISO 7619-2, together with
16、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 test time of 3 s replaces the formerly specified “within 1 s”, giving a more accurate value, as the hardness value drops significantl
17、y 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 for vulcanized rubber, this test time being the same as that specified for plastic in ISO 868 1; ISO 7619 consists of the following
18、 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 7619-2:2004 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 07:43:30 GMT+00:00 2006, Uncontrolled Copy,
19、(c) BSI v Introduction The hardness of rubber, as measured by the IRHD pocket meter or the durometer, is a complex response to 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 pie
20、ce, d) the geometry of the indentor, e) the pressure exerted, f) the rate of increase of pressure, and g) the interval at which 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 correlati
21、ons have been established for some individual rubbers or compounds. NOTE Further information on the relation between the durometer values and IRHD values is given in the literature 4, 5, 6. BS ISO 7619-2:2004 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 07:43:30 GMT+00:00 2006, Uncontrolle
22、d Copy, (c) BSI blank Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 07:43:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 1 Rubber, vulcanized or thermoplastic Determination of indentation hardness Part 2: IRHD pocket meter method 1 Scope This part of ISO 7619 specifies a method for determini
23、ng 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 precision by fixing the pocket h
24、ardness 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 apply. For undated references, the latest edition of the referenced document ISO 48:1994, Rubber, vulcanized or th
25、ermoplastic Determination of hardness (hardness between 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 speci
26、fied conditions. 4 Apparatus 4.1 IRHD pocket hardness 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
27、) To be published. (Revision of ISO 471:1995) BS ISO 7619-2:2004 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 07:43:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 2 Dimensions in millimetres Key 1 hemispherical (diameter 1,575 mm 0,025 mm) a Valid at 30 IRHD. Figure 1 Indentor for IRHD pock
28、et 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 terms of IRHD
29、from the value 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 ov
30、er the 30 IRHD 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 t
31、han 2 mm, in 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. BS ISO 7619-2:2004 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 07:43:
32、30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 3 5.2 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. Satisfactory hardness determin
33、ations cannot be made on rounded, uneven or rough surfaces using pocket meters. However, their use in certain specialized applications is recognized, e.g. ISO 7267-12 for determination of hardness of rubber-covered rolls. In such applications, the limitations of their use shall be clearly identified
34、. 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 intended to be comparable. 7 P
35、rocedure 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, without shock, keeping the foot p
36、arallel 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 pressure foot is in firm conta
37、ct 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 measurements Make five measurements o
38、f 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. NOTE An International Standard f
39、or calibration of hardness meters and durometers, ISO 18898, is under preparation 3. BS ISO 7619-2:2004 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 07:43:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 4 8.2 Checking using standard rubber blocks Press the instrument against a flat piece of
40、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 manufacturers instructions. The set of standard rubber blocks shall consist of a
41、t 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 specified in ISO 48 at intervals not exceeding 6 months. Instruments in regular
42、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 sample and its origin, compound details and curing conditions, if known,
43、 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 dependent on the humidity, type of instrument used, time which elapsed between
44、 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 on the results; d) test results individual values of the indentation har
45、dness 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. BS ISO 7619-2:2004 Licensed Copy: sheffieldun sh
46、effieldun, na, Mon Nov 27 07:43:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 5 Bibliography 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 IS
47、O 18898, Rubber Calibration and verification of hardness testers3) 4 BROWN, R.P, Physical testing of rubber, Chapman and Hall, London, 1996 5 OBERTO S, Rubber Chemistry Technology, 1955, 28, 1054 6 JUVE A.E, Rubber Chemistry Technology, 1957, 30, 367 3) Under preparation. BS ISO 7619-2:2004 Licensed
48、 Copy: sheffieldun sheffieldun, na, Mon Nov 27 07:43:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 7619-2:2004 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view o
49、n standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using t