1、February 2012 Translation by DIN-Sprachendienst.English price group 7No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).IC
2、S 83.060!$yXi“1865370www.din.deDDIN ISO 7619-2Rubber, vulcanized or thermoplastic Determination of indentation hardness Part 2: IRHD pocket meter method (ISO 7619-2:2010)English translation of DIN ISO 7619-2:2012-02Elastomere oder thermoplastische Elastomere Bestimmung der Eindringhrte Teil 2: IRHD-
3、Taschengerteverfahren (ISO 7619-2:2010)Englische bersetzung von DIN ISO 7619-2:2012-02Caoutchouc vulcanis ou thermoplastique Dtermination de la duret par pntration Partie 2: Mthode au duromtre de poche talonn en DIDC (ISO 7619-2:2010)Traduction anglaise de DIN ISO 7619-2:2012-02Together with superse
4、desDIN 53505:2000-08www.beuth.deDocument comprises 1 pagesIn case of doubt, the German-language original shall be considered authoritative.DIN ISO 7619-1:2012-02,002.12 A comma is used as the decimal marker. Contents Page National foreword .3 National Annex NA (informative) Bibliography .4 Introduct
5、ion .5 1 Scope 6 2 Normative references 6 3 Principle 6 4 Apparatus .7 4.1 IRHD pocket hardness meter 7 5 Test pieces .7 5.1 General 7 5.2 Thickness .8 5.3 Surface 8 6 Conditioning and test temperature 8 7 Procedure .8 7.1 General 8 7.2 Test time .8 7.3 Number of measurements .8 8 Calibration and ch
6、ecking 9 8.1 Calibration 9 8.2 Checking using standard rubber blocks .9 9 Test report 9 Bibliography 10 2 DIN ISO 7619-2:2012-02 National foreword This standard has been prepared by Technical Committee ISO/TC 45 Rubber and rubber products” (Secretariat: DSM, Malaysia). The responsible German body in
7、volved in its preparation was the Normenausschuss Materialprfung (Materials Testing Standards Committee), Working Committee NA 062-04-34 AA Prfung der physikalischen Eigenschaften von Kautschuk und Elastomeren. Attention is drawn to the possibility that some of the elements of this document may be t
8、he subject of patent rights. DIN and/or DKE shall not be held responsible for identifying any or all such patent rights. DIN ISO 7619 consists of the following parts, under the general title Rubber, vulcanized or thermoplastic Determination of indentation hardness: Part 1: Durometer method (Shore ha
9、rdness) Part 2: IRHD pocket meter method The DIN Standards corresponding to the International Standards referred to in this document are as follows: ISO 48 DIN ISO 48 ISO 868 DIN EN ISO 868 ISO 18898 DIN ISO 18898 ISO 23529 DIN ISO 23529 Amendments This standard differs from DIN 53505:2000-08 as fol
10、lows: a) the standard has been subdivided into two parts. The IRHD pocket meter method is now given in this standard; b) Shore AM and Shore AO have been introduced; c) the test force calibration has been specified; standard rubber blocks. Previous editions DIN 53503-2: 1943-03 DIN 53503: 1948-08 DIN
11、 53505: 1953-09, 1957-06, 1960-05, 1967-04, 1973-03, 1973-08, 1987-06, 2000-08 3 DIN ISO 7619-2:2012-02 d) it has been specified that instruments in regular use should be checked at least each week against National Annex NA (informative) Bibliography DIN EN ISO 868, Plastics and ebonite Determinatio
12、n of indentation hardness by means of a durometer (Shore hardness) DIN ISO 48, Rubber, vulcanized or thermoplastic Determination of hardness (hardness between 10 IRHD and 100 IRHD) DIN ISO 18898, Rubber Calibration and verification of hardness testers DIN ISO 23529, Rubber General procedures for pre
13、paring and conditioning test pieces for physical test methods 4 DIN ISO 7619-2:2012-02 Introduction The hardness 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 ha
14、nd-held durometer calibrated to measure on the IRHD scale. 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 pr
15、essure; g) the interval after which the hardness is recorded. Because of these factors, it is inadvisable to relate 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 Fur
16、ther information on the relationship between the durometer values and IRHD values is given in the literature345. Rubber, vulcanized or thermoplastic Determination of indentation hardness Part 2: IRHD pocket meter method 5 DIN ISO 7619-2:2012-02 WARNING Persons using this part of ISO 7619 should be f
17、amiliar with normal laboratory 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 cond
18、itions. CAUTION Certain procedures 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 Scop
19、e This part of ISO 7619 specifies 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
20、is possible to increase precision 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
21、 referenced document (including 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 conditionin
22、g test pieces for physical test methods 3 Principle The measured property is the depth of penetration of a specified indentor forced into the material under specified conditions. 6 DIN ISO 7619-2:2012-02 4 Apparatus 4.1 IRHD pocket hardness meter 4.1.1 Pressure foot The pressure foot (see A in Figur
23、e 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 IRHD pocket mete
24、r 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 from th
25、e 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 the indentor of 2,
26、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. 7 DIN ISO 7619-2:2012-02 5.2 Thickness For the determination of hardness by pocket hardness meters, the thickness of the test piece shall be at least 6 mm. For sheets
27、 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 those made on single-thickness pieces. For comparative-test pu
28、rposes, 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 with the pressure foot. Satisfactory hardness determinations
29、 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 the determination of the hardness of rubber-covered rolls. In such applications, the limitations to their use shall be clearly identifie
30、d. 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 shall be used throughout any single test or series of tests inte
31、nded 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 pressure foot to the test piece as rapidly as possible, with
32、out 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 p
33、ressure 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 shall be treated as vulcanized. NOTE A test time of 15 s has
34、 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 8681. 7.3 Number of measurements Make five measurements of hardness at different positio
35、ns 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 interval after which each reading was taken, and determine the media
36、n value and the maximum and minimum values obtained. 8 DIN ISO 7619-2:2012-02 8 Calibration and checking 8.1 Calibration The instrument shall be adjusted and calibrated in accordance with ISO 18898. 8.2 Checking using standard rubber blocks1)Press the instrument against a suitable flat, hard surface
37、 (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 IRHD to 90 IRHD. All adjustments shall be made in accordance with the manufacturers instructions. The set of
38、 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 specified in ISO 48 at intervals not ex
39、ceeding 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 shall include the following information: a) sample details: 1) a full description of the sample and its origin
40、, 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 of ISO 7619; c) test details: 1) the temperature of the test, and the relative humidity when the hardness of
41、 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 of any deviation from the standard procedure, 5) details of any operations not specified in this part of ISO
42、 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 blocks are available from a number of instrument manufacturers and accredited test laboratories. 9 DIN ISO 7619-
43、2:2012-02 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 BROWN, R.P., Physical testing of rubber, Chapman and Hall, London, 2006 4 OBERTO, S., Rubber Chemistry Technology, 1955, 28, 1054 5 JUVE, A.E., Rubber Chemistry Technology, 1957, 30, 367 10 DIN ISO 7619-2:2012-02
