1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 4660:2011Rubber, raw natural Colourindex testBS ISO 4660:2011 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 4660:2011. Itsupersede
2、s BS ISO 4660:1999 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PRI/23, Test methods for rubber and non-blackcompounding ingredients.A list of organizations represented on this committee can beobtained on request to its secretary.This publication doe
3、s not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011ISBN 978 0 580 72980 5ICS 83.040.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of
4、theStandards Policy and Strategy Committee on 31 March 2011.Amendments issued since publicationDate Text affectedBS ISO 4660:2011Reference numberISO 4660:2011(E)ISO 2011INTERNATIONAL STANDARD ISO4660Fourth edition2011-02-15Rubber, raw natural Colour index test Caoutchouc naturel brut Essai dindice d
5、e couleur BS ISO 4660:2011ISO 4660:2011(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer perform
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8、retariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2011 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 wri
9、ting from either ISO at the address below or ISOs 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 2011 All rights reservedBS ISO 46
10、60:2011ISO 4660:2011(E) ISO 2011 All rights reserved iiiContents Page Foreword iv 1 Scope1 2 Normative references1 3 Principle .1 4 Apparatus.1 5 Procedure.4 5.1 Test piece preparation 4 5.2 Colour matching 5 6 Expression of results5 7 Precision and bias.5 8 Test report5 Bibliography6 BS ISO 4660:20
11、11ISO 4660:2011(E) iv ISO 2011 All rights reservedForeword 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 ISO technical committees. Each
12、 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 closely with the Internationa
13、l 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. Draft International Standards
14、 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 document may be the subject of
15、 patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 4660 was prepared by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommittee SC 3, Raw materials (including latex) for use in the rubber industry. This fourth edition cancels and repl
16、aces the third edition (ISO 4660:1999), which has been technically revised. The main change is the deletion of the subclause concerning sample preparation (old Subclause 5.1) together with the associated normative reference ISO 1795. BS ISO 4660:2011INTERNATIONAL STANDARD ISO 4660:2011(E) ISO 2011 A
17、ll rights reserved 1Rubber, raw natural Colour index test WARNING Persons using this International Standard should be familiar with normal laboratory practice. This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user
18、to establish appropriate safety and health practices and to ensure compliance with any national regulatory conditions. 1 Scope This International Standard specifies a method of determining the colour of raw natural rubber according to a standard colour scale. 2 Normative references The following ref
19、erenced 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 referenced document (including any amendments) applies. ISO 2393, Rubber test mixes Preparation, mixing and vulcanization
20、Equipment and procedures 3 Principle The raw rubber is prepared in the form of a moulded disc of specified thickness, and the colour of this disc is compared and matched as closely as possible with that of standard glasses. Colour matching is carried out under diffuse daylight illumination against a
21、 matt white background, preferably by use of a comparator which suitably locates and shrouds the test piece and standard glass. The standard glasses used are calibrated according to the intensity of their colour (amber) to provide a colour index scale in which the higher index values correspond to d
22、arker colours. 4 Apparatus 4.1 Laboratory mill, conforming to the requirements of ISO 2393. 4.2 Mould, of stainless steel or aluminium, 1,6 mm 0,05 mm thick, having cavities approximately 14 mm in diameter with two mould covers of similar material, 1 mm to 2 mm thick. A suitable mould is illustrated
23、 in Figure 1. 4.3 Platen press, capable of applying a pressure of not less than 3,5 MPa over the platen surfaces and maintaining platen temperatures of 150 C 3 C. Platens with lateral dimensions of 200 mm 200 mm are suitable. BS ISO 4660:2011ISO 4660:2011(E) 2 ISO 2011 All rights reservedDimensions
24、in millimetres Figure 1 Mould for colour index test 4.4 Punch, for preparation of the test pieces. The purpose of the punch is to produce test pieces of approximately constant volume quickly and without difficulty. The punch shall consist of a flat-ended cylindrical anvil and a coaxial tubular knife
25、 moving independently of one another; a single action of the handle shall compress a portion of the material to a thickness of approximately 3 mm and shall cut a disc of approximately 13 mm diameter. The test piece need only be approximately constant in volume because the final shaping to exact dime
26、nsions is carried out in the mould during the pre-heating period. NOTE This is identical with the test piece punch described in ISO 2007:2007. 4.5 Transparent polyester or cellulose film, approximately 0,025 mm thick. 4.6 Comparator, as illustrated in Figure 2 or as available commercially. BS ISO 46
27、60:2011ISO 4660:2011(E) ISO 2011 All rights reserved 3Dimensions in millimetres a) Base plate b) Cover plate Figure 2 Comparator for use with commercial Lovibond Comparator discs BS ISO 4660:2011ISO 4660:2011(E) 4 ISO 2011 All rights reserved4.7 Standard coloured glasses, conforming to the requireme
28、nts of Table 1 (colour index scale: 1 to 5 units in half-unit steps and 5 to 16 units in unit steps).1)Table 1 Calibration table for standard glasses CIEa chromaticity coordinates using standard illuminant BbColour index x y z1 0,357 7 0,368 6 0,275 2 1,5 0,362 9 0,372 8 0,265 5 2 0,367 2 0,377 0 0,
29、255 8 2,5 0,373 8 0,380 4 0,245 8 3 0,377 6 0,385 5 0,236 9 3,5 0,384 2 0,389 6 0,226 2 4 0,388 0 0,393 5 0,218 5 4,5 0,392 5 0,397 9 0,211 0 5 0,396 5 0,400 3 0,203 2 6 0,405 0 0,408 9 0,186 1 7 0,414 1 0,412 4 0,173 6 8 0,412 6 0,418 6 0,159 8 9 0,430 2 0,423 0 0,146 9 10 0,437 1 0,425 9 0,137 0 1
30、1 0,443 9 0,427 0 0,129 0 12 0,449 1 0,430 8 0,120 0 13 0,454 2 0,432 9 0,113 0 14 0,461 0 0,435 0 0,104 0 15 0,466 2 0,436 1 0,097 7 16 0,471 0 0,438 9 0,090 0 aCommission Internationale de lclairage (International Commission on Illumination). bStandard illuminant B corresponds to the yellower phas
31、es of daylight (colour temperature 4 870 K). 5 Procedure 5.1 Test piece preparation Clean the mill (4.1) thoroughly and then proceed as follows: Take a test portion of about 30 g from the homogenized piece and pass three times (doubling the sheet between passes) between the mill rolls, at room tempe
32、rature and with the distance between the rolls adjusted so that the final sheet thickness is about 1,7 mm. Immediately double the sheet, which shall be uniform in texture and free from holes, and lightly press the two halves together by hand, avoiding the formation of air bubbles. From the doubled s
33、heet (3,2 mm to 3,6 mm thick) cut two pellets with the test piece punch (4.4) and press them lightly together. 1)These glasses are also referred to as Lovibond Comparator discs, 4/19A in 1 to 5 units and 4/19B in 5 to 16 units, and are commmercially available from Tintometer Limited, Waterloo Road,
34、Salisbury SP1 2JY, England. Tel: (01722) 327242, Fax: (01722) 412322. This information is given for the convenience of users of this International Standard and does not constitute an endorsement by ISO of the product named. BS ISO 4660:2011ISO 4660:2011(E) ISO 2011 All rights reserved 5Press this te
35、st piece in the mould (4.2) between two sheets of polyester or cellulose film (4.5), with mould covers superimposed, at a pressure of not less than 3,5 MPa for 5 min 0,2 min at 150 C 3 C. Retain the test piece in the mould, with the transparent cover films attached, for testing. The moulded test pie
36、ce shall be 1,6 mm 0,1 mm thick, excluding cover films, and shall be free from extraneous contaminants. 5.2 Colour matching Compare the test piece with standard glasses (4.7). Carry out the colour matching under diffuse daylight illumination against a matt white background, viewing in a direction no
37、rmal to the major surface of the test piece. Take the colour index of the test piece as that of the glass giving the closest colour match. If the comparator shown in Figure 2 is used, first place a sheet of white paper (with holes to accommodate the projections) on the base plate. Then fit the disc
38、of standard glasses and the filled mould (with transparent cover films attached) over the projections and place the cover plate in position. Carry out the colour matching. 6 Expression of results Report the colour index of the rubber to the nearest half-unit for index values 1 to 5 and to the neares
39、t unit for higher values. Very occasionally, the colour of the rubber cannot be matched owing to the presence of strong yellow, green or grey tints. In this case, report that the colour index cannot be determined, stating the reason, e.g. “green tint too strong”. 7 Precision and bias No statement is
40、 made about the precision and bias of this test method for measuring colour of raw natural rubber, since the results merely state whether there is conformance to the criteria for the parameter in terms of an index using a comparative standard. 8 Test report The test report shall include the followin
41、g particulars: a) a reference to this International Standard; b) all details necessary for the identification of the sample; c) the results and the units in which they have been expressed; d) any unusual features noted during the determination; e) any operation not included in this International Sta
42、ndard or in the International Standard to which reference is made, plus any operation regarded as optional; f) the date of the test. BS ISO 4660:2011ISO 4660:2011(E) 6 ISO 2011 All rights reservedBibliography 1 ISO 2007:2007, Rubber, unvulcanized Determination of plasticity Rapid-plastimeter method
43、BS ISO 4660:2011BS ISO 4660:2011ISO 4660:2011(E) ICS 83.040.10 Price based on 6 pages ISO 2011 All rights reserved This page deliberately left blankBSI is the independent national body responsible for preparing British Standardsand other standards-related publications, information and services. It p
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