1、raising standards worldwide NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BSI Standards Publication BS ISO 8511:2011 Rubber compounding ingredients Carbon black Determination of pellet size distributionBS ISO 8511:2011 BRITISH STANDARD National foreword This British Standard
2、 is the UK implementation of ISO 8511:2011. It supersedes BS 5293-4:1996 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee PRI/50, Rubber - Raw, natural and synthetic, including latex and carbon black. A list of organizations represented on this committ
3、ee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. BSI 2011 ISBN 978 0 580 74037 4 ICS 83.040.20 Compliance with a British Standard cannot confer immunity from leg
4、al obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 October 2011. Amendments issued since publication Date T e x t a f f e c t e dBS ISO 8511:2011 Rubber compounding ingredients Carbon black Determination of pellet size distrib
5、ution Ingrdients de mlange du caoutchouc Noir de carbone Dtermination de la distribution granulomtrique ISO 2011 Reference number ISO 8511:2011(E) Third edition 2011-10-15 ISO 8511 INTERNATIONAL STANDARDBS ISO 8511:2011 ISO 8511:2011(E)COPYRIGHT PROTECTED DOCUMENT ISO 2011 All rights reserved. Unles
6、s 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 writing from either ISO at the address below or ISOs member body in the country of the requester. ISO co
7、pyright 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 8511:2011 Foreword ISO (the International Organization for Standardization) is a worldwide federation o
8、f national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO 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. In
9、ternational organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with
10、the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval
11、 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 patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 8511 was prepared by Technical Committee I
12、SO/TC 45, Rubber and rubber products, Subcommittee SC 3, Raw materials (including latex) for use in the rubber industry. This third edition cancels and replaces the second edition (ISO 8511:1995), of which it constitutes a minor revision. The following changes have been made: the normative reference
13、s have been updated; in the footnote to Clause 4, the details of the suppliers of the Ro-Tap sieve shaker have been updated; the precision statement has been moved to an informative annex. ISO 8511:2011(E) ISO 2011 All rights reserved iiiBS ISO 8511:2011BS ISO 8511:2011 INTERNATIONAL STANDARD ISO 85
14、11:2011(E) Rubber compounding ingredients Carbon black Determination of pellet size distribution 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
15、. It is the responsibility of the user to establish appropriate safety and health practices and to ensure compliance with any national regulatory conditions. 1 Scope Carbon black for the rubber industry is generally pelletized to reduce dust and to improve handling and incorporation into polymers. V
16、ariations in pellet size distribution can affect dispersion in polymers, bulk handling, and conveying properties. This International Standard specifies a method for the determination of the pellet size distribution of carbon black. 2 Normative references The following referenced documents are indisp
17、ensable 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 565, Test sieves Metal wire cloth, perforated metal plate and electroformed sheet Nominal
18、sizes of openings ISO 1124, Rubber compounding ingredients Carbon black shipment sampling procedures 3 Principle Pelletized carbon black is passed through a succession of sieves with different-sized apertures and the amount retained by each is determined. 4 Apparatus 4.1 Mechanical sieve shaker 1) ,
19、 which imparts a uniform rotary and tapping motion to a stack of nominally 200 mm diameter sieves. The mechanism shall produce 280 to 320 rotary motions per minute (4,6 to 5,3 per second) and 140 to 160 taps per minute (2,3 to 2,7 per second) to a cork fitted into the centre of the top-sieve cover (
20、4.4) and extending 3 mm to 9 mm above it. Only cork shall be used, rubber being unsuitable. 4.2 Sieves, nominally 200 mm diameter, 25 mm high, of woven metal wire cloth, conforming to ISO 565, having apertures of 2,00 mm, 1,00 mm, 0,5 mm, 0,25 mm and 0,125 mm. A 0,71 mm aperture sieve may be added i
21、f pellets produced by a dry process are tested. 1) A Ro-Tap sieve shaker is an example of a suitable apparatus available commercially from:Tyler Power Systems, 8570 Tyler Boulevard, Mentor, OH 44060, USA,orHaver 0,125 mm; 0,25 mm, 0,5 mm, 1,00 mm; 2,00 mm. If a 0,71 mm sieve is used, or sieves of si
22、zes not specified in 4.2, place them in the appropriate position in the stack. 6.2 Pass the sample through the sample splitter (4.5) and take two test portions, each of 100 g 10 g. 6.3 Weigh each test portion to the nearest 0,1 g. 6.4 Transfer a test portion to the top sieve, fit the sieve cover (4.
23、4) and place the assembly in the mechanical shaker (4.1). 6.5 Allow the assembly to shake for 60 s to 70 s. 6.6 Remove the sieve assembly from the shaker, transferring each fraction in turn to the container (4.7) and weighing the carbon black retained on each sieve and in the bottom receiver (4.3) i
24、ndividually to the nearest 0,1 g. 6.7 Repeat the operations in 6.4 to 6.6 for the second test portion. 7 Expression of results 7.1 Calculate the pellet size distribution as a percentage of the test portion retained by each sieve, using the formula: where m iis the mass, in grams, of carbon black on
25、the ith test sieve or in the bottom receiver; m 0is the mass, in grams, of the test portion. ISO 8511:2011(E)2 ISO 2011 All rights reservedBS ISO 8511:2011 7.2 Add the masses of carbon black retained by all the sieves and in the bottom receiver. If the loss exceeds 2 %, the test results shall be reg
26、arded as invalid. 7.3 Calculate the mean distribution of the pellet size retained by each sieve from the two sets of results. 8 Precision See Annex A. 9 Test report The test report shall include the following information: a) a reference to this International Standard; b) all details necessary for id
27、entification of the sample; c) the mean values of the two test results, to the nearest whole number, as follows: the percentage retained on the 2,00 mm sieve, the percentage passing the 2,00 mm sieve but retained on the 1,00 mm sieve, the percentage passing the 1,00 mm sieve but retained on the 0,5
28、mm sieve, the percentage passing the 0,5 mm sieve but retained on the 0,25 mm sieve, the percentage passing the 0,25 mm sieve but retained on the 0,125 mm sieve, the percentage passing the 0,125 mm sieve. If a mesh size different from those specified in 4.2 is used, its results shall be included in
29、the appropriate position in the test report. ISO 8511:2011(E) ISO 2011 All rights reserved 3BS ISO 8511:2011 Annex A (informative) Precision statement A.1 General The precision data give an estimate of the precision as described below. The precision parameters should not be used for acceptance/rejec
30、tion testing of any group of materials without documentation that they are applicable to those particular materials and the specific testing protocols that include this test method. The repeatability and reproducibility were calculated in accordance with ISO/TR 9272:1986, Rubber and rubber products
31、Determination of precision for test method standards (now withdrawn). A.2 Details of test programme These precision data are based on duplicate tests of three samples by seven laboratories on two days. The range of samples studied is given in Table A.1 for each sieve. Table A.1 Range of samples Siev
32、e aperture mm Range % 2,00 1,00 0,50 0,25 0,125 Receiver 0,6 to 3,5 26,9 to 68,7 24,6 to 44,9 3,2 to 21,4 1,2 to 6,2 0,8 to 1,9 Both the repeatability and the reproducibility values represent short-term testing. Precision is expressed in percent relative terms. A.3 Single test A.3.1 Repeatability (s
33、ingle operator) The repeatability r has been estimated as reported in Table A.2. Two single test results that differ by more than the values given in Table A.2 should be considered suspect and dictate that some appropriate investigative action be taken. ISO 8511:2011(E)4 ISO 2011 All rights reserved
34、BS ISO 8511:2011 Table A.2 Repeatability of single test Sieve aperture mm Repeatability % relative 2,00 1,00 0,50 0,25 0,125 Receiver 34,7 12,2 15,3 22,7 62,7 67,6 A.3.2 Reproducibility (between laboratories) The reproducibility R has been estimated as reported in Table A.3. Two single test results
35、produced in separate laboratories that differ by more than the values given in Table A.3 should be considered suspect and dictate that some appropriate investigative action be taken. Table A.3 Reproducibility of single test Sieve aperture mm Reproducibility % relative 2,00 1,00 0,50 0,25 0,125 Recei
36、ver 100,8 56,5 73,1 74,0 119,2 139,6 A.4 Duplicate test average A.4.1 Repeatability (single operator) The repeatability r has been estimated as reported in Table A.4. Two duplicate test averages that differ by more than the values given in Table A.4 should be considered suspect and dictate that some
37、 appropriate investigative action be taken. ISO 8511:2011(E) ISO 2011 All rights reserved 5BS ISO 8511:2011 Table A.4 Repeatability of duplicate tests Sieve aperture mm Repeatability % relative 2,00 1,00 0,50 0,25 0,125 Receiver 26,8 8,7 12,9 19,9 44,8 52,2 A.4.2 Reproducibility (between laboratorie
38、s) The reproducibility R has been estimated as reported in Table A.5. Two duplicate test averages produced in separate laboratories that differ by more than the values given in Table A.5 should be considered suspect and dictate that some appropriate investigative action be taken. Table A.5 Reproduci
39、bility of duplicate tests Sieve aperture mm Reproducibility % relative 2,00 1,00 0,50 0,25 0,125 Receiver 101,8 53,9 72,3 69,3 91,0 107,2 A.5 Bias In test method terminology, bias is the difference between an average measured test property value and an accepted reference (true) value. Reference valu
40、es do not exist for this test method since the value of the test property is defined solely by the test method. The bias cannot, therefore, be determined. A.6 Recommendation Due to the poor reproducibility of the method, it is recommended that the test be limited to within-laboratory usage. ISO 8511
41、:2011(E)6 ISO 2011 All rights reservedBS ISO 8511:2011BS ISO 8511:2011 ISO 8511:2011(E) ISO 2011 All rights reserved ICS 83.040.20 Price based on 6 pagesThis page deliberately left blankBSI is the independent national body responsible for preparing British Standards and other standards-related publi
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