DIN ISO 7619-1-2012 Rubber vulcanized or thermoplastic - Determination of indentation hardness - Part 1 Durometer method (Shore hardness) (ISO 7619-1 2010)《硫化橡胶或热塑性橡胶 压痕硬度的测定 第1部分 .pdf

1、February 2012 Translation by DIN-Sprachendienst.English price group 11No 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).I

2、CS 83.060!$yXg“1865368www.din.deDDIN ISO 7619-1Rubber, vulcanized or thermoplastic Determination of indentation hardness Part 1: Durometer method (Shore hardness) (ISO 7619-1:2010)English translation of DIN ISO 7619-1:2012-02Elastomere oder thermoplastische Elastomere Bestimmung der Eindringhrte Tei

3、l 1: Durometer-Verfahren (Shore-Hrte) (ISO 7619-1:2010)Englische bersetzung von DIN ISO 7619-1:2012-02Caoutchouc vulcanis ou thermoplastique Dtermination de la duret par pntration Partie 1: Mthode au duromtre (duret Shore) (ISO 7619-1:2010)Traduction anglaise de DIN ISO 7619-1:2012-02Together with s

4、upersedesDIN 53505:2000-08www.beuth.deDocument comprises 15 pagesIn case of doubt, the German-language original shall be considered authoritative.DIN ISO 7619-2:2012-02,02.12 A comma is used as the decimal marker. Contents Page National foreword .3 National Annex NA (informative) Bibliography .4 Int

5、roduction .5 1 Scope 6 2 Normative references 6 3 Principle and choice of durometer type 6 4 Apparatus .7 4.1 Durometer types A, D and AO .7 4.2 Durometer type AM 9 4.3 Stand .9 4.4 Durometer spring force calibration 10 5 Test pieces .10 5.1 General 10 5.2 Thickness .10 5.3 Surface 11 6 Conditioning

6、 and test temperature 11 7 Procedure .11 7.1 General 11 7.2 Test time .11 7.3 Measurements 11 8 Calibration and checking 11 8.1 Calibration 11 8.2 Checking using standard rubber blocks .12 9 Precision .12 10 Test report 12 Annex A (informative) Precision for the type AM durometer compared to that of

7、 Micro IRHD testing .13 Bibliography 15 2 DIN ISO 7619-1:2012-02 National foreword This standard has been prepared by Technical Committee ISO/TC 45 Rubber and rubber products” (Secretariat: DSM, Malaysia). The responsible German body involved in its preparation was the Normenausschuss Materialprfung

8、 (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 the subject of patent rights. DIN and/or DKE shall not be held re

9、sponsible 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 hardness) Part 2: IRHD pocket meter method The DIN Standards corre

10、sponding to the International Standards referred to in this document are as follows: ISO 48 DIN ISO 48 ISO 868 DIN EN ISO 868 ISO 23529 DIN ISO 23529 Amendments This standard differs from DIN 53505:2000-08 as follows: a) the standard has been subdivided into two parts. The IRHD pocket meter method i

11、s given in DIN ISO 7619-2; b) Shore AM and Shore AO have been introduced; c) the test force calibration has been specified; d) in Figure 2 (former Figure 1) showing the indentor for type D durometer, the tolerance for the 30 angle has been reduced from 1,0 to 0,25; e) it has been specified that inst

12、ruments in regular use should be checked at least each week against standard rubber blocks. Previous editions DIN 53503-2: 1943-03 DIN 53503: 1948-08 DIN 53505: 1953-09, 1957-06, 1960-05, 1967-04, 1973-03, 1973-08, 1987-06, 2000-08 3 DIN ISO 7619-1:2012-02 National Annex NA (informative) Bibliograph

13、y DIN EN ISO 868, Plastics and ebonite Determination 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 23529, Rubber General procedures for preparing and condition

14、ing test pieces for physical test methods 4 DIN ISO 7619-1:2012-02 Introduction The hardness of rubber, as measured by a durometer (Shore hardness) or an IRHD pocket meter, is determined from the response of the rubber to an applied indentation. The response is a complex one and will depend upon: a)

15、 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; g) the interval after which the hardness is recorded. Because of these factors, it is i

16、nadvisable to relate results using a durometer (Shore hardness) directly to IRHD values, although correlations have been established for some individual rubbers and compounds. Durometers were originally portable hand-held instruments that have proved to be particularly convenient for making measurem

17、ents on products. Some laboratories now also use them on a stand with a weight applied to the pressure foot in order to improve precision. NOTE ISO 481specifies hardness measurements for determination of hardness between 10 IRHD and 100 IRHD. Further information on the relationship between the durom

18、eter values and IRHD values is given in the literature567. Rubber, vulcanized or thermoplastic Determination of indentation hardness Part 1: Durometer method (Shore hardness) 5 DIN ISO 7619-1:2012-02 WARNING Persons using this part of ISO 7619 should be familiar with normal laboratory practice. This

19、 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 procedures specified

20、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 specifies a method fo

21、r determining the indentation hardness (Shore hardness) of vulcanized or thermoplastic rubber using durometers with the following scales: the A scale for rubbers in the normal-hardness range; the D scale for rubbers in the high-hardness range; the AO scale for rubbers in the low-hardness range and f

22、or cellular rubbers; the AM scale for thin rubber test pieces in the normal-hardness range. 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 editi

23、on of the referenced document (including any amendments) applies. ISO 18898, Rubber Calibration and verification of hardness testers ISO 23529, Rubber General procedures for preparing and conditioning test pieces for physical test methods 3 Principle and choice of durometer type The property measure

24、d is the depth of penetration of a specified indentor forced into the material under specified conditions. 6 DIN ISO 7619-1:2012-02 When using durometers, the scale should be chosen as follows: for values less than 20 with a type D durometer: type A; for values less than 20 with a type A durometer:

25、type AO; for values over 90 with a type A durometer: type D; for thin test pieces (less than 6 mm thick): type AM. 4 Apparatus 4.1 Durometer types A, D and AO These durometers consist of the components specified in 4.1.1 to 4.1.5. 4.1.1 Pressure foot The pressure foot for types A and D shall have a

26、diameter of 18 mm 0,5 mm and a central hole of diameter 3 mm 0,1 mm. For type AO, the pressure foot shall have a minimum area of 500 mm2with a central hole of diameter 5,4 mm 0,2 mm. The tolerances on the dimension of the central hole and the requirement for the size of the pressure foot only apply

27、to instruments used on a stand. 4.1.2 Indentor The indentor shall be formed from a hardened-steel rod of diameter 1,25 mm 0,15 mm to the shape and dimensions shown in Figure 1 for type A durometers and Figure 2 for type D durometers. Type AO durometers shall have a round indentor with a radius of 2,

28、5 mm 0,02 mm in accordance with Figure 3. 4.1.3 Indicating device This is a device for allowing the extent of protrusion of the point of the indentor beyond the face of the pressure foot to be read. It shall be calibrated directly in terms of units ranging from 0 for the maximum protrusion of 2,50 m

29、m 0,02 mm to 100 for zero protrusion obtained by placing the pressure foot and indentor in firm contact with a suitable flat, hard surface (e.g. glass). 4.1.4 Calibrated spring This is used to apply a force, F, expressed in millinewtons, to the indentor in accordance with one of the following equati

30、ons: For type A durometers: F = 550 + 75HAwhere HAis the hardness reading taken from the type A durometer. For type D durometers: F = 445HDwhere HDis the hardness reading taken from the type D durometer. For type AO durometers: F = 550 + 75HAOwhere HAOis the hardness reading taken from the type AO d

31、urometer. 7 DIN ISO 7619-1:2012-02 Dimensions in millimetres Dimensions in millimetresaThe protrusion shown is valid for a reading of 0. aThe protrusion shown is valid for a reading of 0. Figure 1 Indentor for type A durometer Figure 2 Indentor for type D durometer Dimensions in millimetres Dimensio

32、ns in millimetresaThe protrusion shown is valid for a reading of 0. aThe protrusion shown is valid for a reading of 0. Figure 3 Indentor for type AO durometerFigure 4 Indentor for type AM durometer4.1.5 Automatic timing device (optional) The timer shall be automatically activated when the pressure f

33、oot is in contact with the test piece and shall indicate the end of the test time or lock the test value at its completion. Use of a timing device for the test time improves precision. When the instrument is used on a stand, the time tolerance shall be 0,3 s. 8 DIN ISO 7619-1:2012-02 4.2 Durometer t

34、ype AM This durometer consists of the components specified in 4.2.1 to 4.2.5. 4.2.1 Pressure foot The pressure foot shall have a diameter of 9 mm 0,3 mm and a central hole of diameter 1,19 mm 0,03 mm. 4.2.2 Indentor The indentor shall be formed from a hardened-steel rod of diameter 0,79 mm 0,025 mm

35、to the shape and dimensions shown in Figure 4. 4.2.3 Indicating device This is a device for allowing the extent of protrusion of the point of the indentor beyond the face of the pressure foot to be read. It shall be calibrated directly in terms of units ranging from 0 for the maximum protrusion of 1

36、,25 mm 0,01 mm to 100 for zero protrusion obtained by placing the pressure foot and indentor in firm contact with a suitable flat, hard surface (e.g. glass). 4.2.4 Calibrated spring This is used to apply a force, F, expressed in millinewtons, to the indentor in accordance with the equation: F = 324

37、+ 4,4HAMwhere HAMis the hardness reading taken from the type AM durometer. 4.2.5 Automatic timing device (optional) The timer shall be automatically activated when the pressure foot is in contact with the test piece and shall indicate the end of the test time or lock the test value at its completion

38、. Use of a timing device for the test time improves precision. The time tolerance shall be 0,3 s. 4.3 Stand 4.3.1 Better precision is obtained by using a stand with a weight centred on the axis of the indentor to apply the pressure foot to the test piece. Durometer types A, D and AO may be used eith

39、er as pocket meters by hand or mounted on a stand. Type AM durometers shall always be mounted on a stand. 4.3.2 The operating stand shall be capable of supporting the pressure-foot surface of the durometer parallel to the test piece support table. 4.3.3 The stand shall be capable of applying the tes

40、t piece to the indentor, or vice versa, without shock. NOTE A maximum speed of 3,2 mm/s has been found to be suitable. 4.3.4 The total mass of the durometer and extra mass to overcome the spring force shall be: 0,101+kg for types A and AO; 0,505+kg for type D; 0,0500,25+kg for type AM. 9 DIN ISO 761

41、9-1:2012-02 4.4 Durometer spring force calibration The force values shall be in accordance with Table 1. Table 1 Durometer spring forces Spring force mN Indicated durometer value Type AM Type A and AO Type D 0 324 550 10 368 1 300 4 450 20 412 2 050 8 900 30 456 2 800 13 350 40 500 3 550 17 800 50 5

42、44 4 300 22 250 60 588 5 050 26 700 70 632 5 800 31 150 80 676 6 550 35 600 90 720 7 300 40 050 100 764 8 050 44 500 Millinewtons (mN) per unit 4,4 75 445 Spring force tolerance 8,8 37,5 222,5 NOTE For hand-held durometers, the tolerances may be increased; in particular, the spring force tolerance c

43、an be doubled. 5 Test pieces 5.1 General Test pieces shall be prepared in accordance with ISO 23529. 5.2 Thickness For the determination of hardness using type A, D and AO durometers, the thickness of the test piece shall be at least 6 mm. For the determination of hardness using type AM durometers,

44、the thickness of the test piece shall be at least 1,5 mm. For sheets thinner than 6 mm and 1,5 mm (see above), the test piece may be composed of not more than three layers, in order to obtain the necessary thickness. However, determinations made on such test pieces might not agree with those made on

45、 single-layer test pieces. For comparative-test purposes, the test pieces shall be similar. NOTE Measurements made on thin test pieces of soft rubber will be influenced by the support table and will give a result which is too high. 10 DIN ISO 7619-1:2012-02 5.3 Surface The other dimensions of the te

46、st piece shall be sufficient to permit measurements at least 12 mm away from any edge for types A and D, and 15 mm and 4,5 mm away from any edge for type AO and type AM, respectively. The surface of the test piece shall be flat and parallel over an area sufficient to permit the pressure foot to come

47、 into contact with the test piece over an area having a radius of at least 6 mm from the indentor point for types A and D, 9 mm for type AO and 2,5 mm for type AM. Satisfactory hardness determinations cannot be made on rounded, uneven or rough surfaces using durometers. However, their use in certain

48、 specialized applications is recognized, e.g. ISO 7267-23for the determination of the hardness of rubber-covered rolls. In such applications, 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 shall be used throughout an