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1、BRITISH STANDARD BS 7442-3.2: 1991 ISO 7267-2: 1986 Rubber or plastics covered rollers Part 3: Methods of test Section 3.2 Determination of shore hardness Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:33:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7442
2、-3.2:1991 This British Standard, having been prepared under the direction of the Plastics and Rubber Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 30 September 1991 BSI 08-1999 The following BSI references relate to the work on this sta
3、ndard: Committee reference PRM/73 Draft for comment 83/52641 DC ISBN 0 580 20027 2 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Plastics and Rubber Standards Policy Committee (PRM/-) to Technical Committee PRM/73, upon which the follo
4、wing bodies were represented: British Rubber Manufacturers Association Ltd. British Structural Bearings Manufacturers Association Building Employers Confederation Department of the Environment (Building Research Establishment) Department of Transport Institute of Medical Laboratory Sciences Institut
5、ion of Structural Engineers Malaysian Rubber Producers Research Association Ministry of Defence Royal Society of Chemistry Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:33:52 GMT+00:00 2006, Uncontrol
6、led Copy, (c) BSI BS 7442-3.2:1991 BSI 08-1999i Contents Page Committees responsibleInside front cover National forewordii 0Introduction1 1Scope and field of application1 2References1 3Time interval between vulcanization and finished grinding, and testing1 4Conditioning and temperature of test1 5App
7、aratus1 6Procedure1 7Expression of results2 8Test report2 Publication(s) referred toInside back cover Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:33:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7442-3.2:1991 ii BSI 08-1999 National foreword This Secti
8、on of BS 7442 has been prepared under the direction of the Plastics and Rubber Standards Policy Committee. It is identical with ISO 7267-2:1986 “Rubber-covered rollers Determination of apparent hardness Part 2: Shore-type durometer method”, published by the International Organization for Standardiza
9、tion (ISO). ISO 7267-2:1986 is intended for use with vulcanized rubber roller covers (see clause 1), but it is also suitable for thermoplastic rubbers and plastics. The Technical Committee has reviewed the provisions of ISO 1826:1981 to which reference is made in the text and has decided that they a
10、re acceptable for use in conjunction with this British Standard. A British Standard related to ISO 1826:1981 is BS 903-A19:1986. At the present time there is no corresponding British Standard to ISO 6123-1, but BS 7442-4 will introduce specifications for rubber or plastics covered rollers (see BS 74
11、42-0). A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references International Sta
12、ndardCorresponding British Standard BS 903 Physical testing of rubber ISO 471:1983Part A35:1985 Temperatures, humidities and times for conditioning and testing of test pieces (Identical) BS 7619:1986Part A57:1989 Determination of indentation hardness by means of pocket hardness meters (Identical) Su
13、mmary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 and 2, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside
14、 front cover. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:33:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7442-3.2:1991 BSI 08-19991 0 Introduction The hardness of a roller covering has traditionally been determined on the finished roller, since it is
15、 this hardness that is critical to the correct functioning of the roller in its end application. Values of hardness determined by whichever method is chosen are therefore dependent not only on the method employed and on the rubber, but also on the diameter of the roller and on the thickness of the c
16、overing and in the case of thin coverings on the nature of the roller core. For this reason the term “apparent hardness” is used to distinguish between the values obtained by the methods described in the various parts of this International Standard and those that would be obtained for the rubber if
17、it was possible to use the standard test methods for standard test pieces forming the subjects of other International Standards. Since rollers vary considerably in size, construction and end use, and in view of the fact that hardness determinations are made for such different purposes as specificati
18、on and factory process control, it has not been possible to standardize on one test method. Consequently three methods are described each capable of standing alone. Therefore this International Standard comprises the following parts: Part 1: IRHD method; Part 2: Shore-type durometer method; Part 3:
19、Pusey and Jones method. 1 Scope and field of application This part of ISO 7267 specifies a method for the determination of the apparent hardness of vulcanized rubber roller covers, expressed in Shore hardness, for measurement where only medium precision is required. The method and apparatus used are
20、 essentially those described in ISO 7619, the measurements in this case being made on the curved surface of the conditioned rubber covered roller rather than on a flat test piece. Shore-type A and D instruments are specified, the latter being used for measurements on rollers of high hardness. 2 Refe
21、rences ISO 471, Rubber Standard temperatures, humidities and times for the conditioning and testing of test pieces. ISO 1826, Rubber, vulcanized Time-interval between vulcanization and testing Specification. ISO 6123-1, Rubber- or plastics-covered rollers Specifications Part 1: Requirements for hard
22、ness. ISO 7619, Rubber Determination of indentation hardness by means of pocket hardness meters. 3 Time interval between vulcanization and finished grinding, and testing Tests shall not be carried out less than 16 h after vulcanization and/or finished grinding and, for arbitration purposes, not less
23、 than 72 h after vulcanization (see ISO 1826). 4 Conditioning and temperature of test Where possible, the test shall be carried out at standard laboratory temperature in accordance with ISO 471. The product under test should be maintained under the test condition for sufficient time to reach tempera
24、ture equilibrium with the test environment. Where this is impracticable, the period of time and the conditions shall be given in the product specification (see the note). The same temperature shall be used throughout any one test or series of tests intended to be comparable. NOTEFor large rollers ha
25、ving heavy metal cores, ambient conditions may not allow equilibrium temperatures to be obtained. 5 Apparatus The apparatus used shall be either the Shore type A or the Shore type D instruments described in ISO 7619 calibrated in accordance with the method given. Measurements shall be made with type
26、 D instruments when values above 90 are obtained with the type A durometer and with the type A instrument when values less than 20 are obtained with type D durometers. 6 Procedure 6.1 Firmly locate the roller to be tested, with its major axis horizontal and with the area in which the hardness is to
27、be measured uppermost. Hold the hardness meter in position with the indentor immediately above the area which is to be measured. Apply the presser foot to the roller surface as rapidly as possible, without shock, ensuring that the indentor is normal to the rubber surface. Apply just sufficient force
28、 to obtain firm contact between the presser foot and the roller. Take the reading 1 s after the presser foot is in firm contact with the roller surface. 6.2 Make three measurements at different points at least 6 mm apart within the test area at which the hardness is to be determined. NOTE 1Better re
29、producibility may be obtained by using either a stand or mass centred on the axis of the indentor, or both, to apply the presser foot to the test piece. For Shore-type durometers, masses of 1 kg and 5 kg are recommended for type A and type D respectively. Licensed Copy: London South Bank University,
30、 London South Bank University, Fri Dec 08 14:33:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7442-3.2:1991 2 BSI 08-1999 NOTE 2Several test areas along the length and around the circumference of the roller may be required to determine the average hardness of the covering and the hardness variati
31、on over a single roller (see ISO 6123-1). 7 Expression of results Express the apparent hardness as the median of the three measurements for each test area reported to the nearest whole number in Shore A or Shore D. 8 Test report The test report shall include the following information: a) a reference
32、 to this part of ISO 7267; b) a complete identification of the roller tested; c) conditioning and temperature of test; d) the apparent hardness, expressed as Shore A or Shore D; e) the date of the test. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:33:52 GM
33、T+00:00 2006, Uncontrolled Copy, (c) BSI BS 7442-3.2:1991 BSI 08-1999 Publication(s) referred to See national foreword. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:33:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7442-3.2: 1991 ISO 7267-2: 1986 BSI 389
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