1、BSI Standards PublicationBS ISO 2005:2014Rubber latex, natural,concentrate Determinationof sludge contentBS ISO 2005:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 2005:2014. Itsupersedes BS 6057-3.13:1993 which is withdrawn.The UK participation in its pr
2、eparation was entrusted to TechnicalCommittee PRI/50/-/1, Rubber - Latex.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctappli
3、cation. The British Standards Institution 2014. Published by BSI StandardsLimited 2014ISBN 978 0 580 83273 4ICS 83.040.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committ
4、ee on 31 December 2014.Amendments issued since publicationDate Text affectedBS ISO 2005:2014 ISO 2014Rubber latex, natural, concentrate Determination of sludge contentLatex concentr de caoutchouc naturel Dtermination de la teneur en sdimentINTERNATIONAL STANDARDISO2005Fourth edition2014-12-15Referen
5、ce numberISO 2005:2014(E)BS ISO 2005:2014ISO 2005:2014(E)ii ISO 2014 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2014All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, inc
6、luding photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 2
7、2 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 2005:2014ISO 2005:2014(E)Contents PageForeword iv1 Scope . 12 Normative references 13 Principle 14 Reagents 15 Apparatus . 16 Sampling 17 Procedure. 28 Expression of results 29 Precision . 210 Test report . 2Annex A (inf
8、ormative) Precision . 3Bibliography 5 ISO 2014 All rights reserved iiiBS ISO 2005:2014ISO 2005:2014(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally
9、 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. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the w
10、ork. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the dif
11、ferent approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).Attention is drawn to the possibility that some of the elements of this document m
12、ay be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/pate
13、nts).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principl
14、es in the Technical Barriers to Trade (TBT), see the following URL: Foreword Supplementary information .The committee responsible for this document is ISO/TC 45, Rubber and rubber products, Subcommittee SC 3, Raw materials (including latex) for use in the rubber industry.This fourth edition cancels
15、and replaces the third edition (ISO 2005:1992), which has been technically revised. It also incorporates the amendment ISO 2005:1992/Amd1:2006.The following changes have been made: in the last paragraph of Clause 7, the temperature was changed from (70 2) C to (70 5) C, and the period of 30 min for
16、the loss in mass was deleted; the precision statement was updated following an interlaboratory test programme conducted in 2012; it was moved to informative Annex A; a Bibliography was added.iv ISO 2014 All rights reservedBS ISO 2005:2014Rubber latex, natural, concentrate Determination of sludge con
17、tent1 ScopeThis International Standard specifies a method for the determination of the sludge content of natural rubber latex concentrate.The method is not necessarily suitable for latices from natural sources other than Hevea brasiliensis.It is not suitable for compounded latex or vulcanized latex.
18、2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendm
19、ents) applies.ISO 123, Rubber latex Sampling3 PrincipleA test portion is centrifuged and the resultant sludge washed repeatedly with ammonia-alcohol solution. The sludge is then dried to constant mass.4 ReagentsDuring the analysis, use only reagents of recognized analytical grade and only distilled
20、water or water of equivalent purity.4.1 Ammonia and alcohol, solution having the following composition: ammonia solution, (0,90 0,02) g/cm310 cm3 ethanol, 95 % (by volume) minimum purity 340 cm3 water 1 000 cm35 ApparatusUse ordinary laboratory apparatus and the following.5.1 Centrifuge, producing a
21、 mean acceleration of approximately 12 000 m/s2(1 200 g), with two 50 cm3conical centrifuge tubes or round centrifuge tubes.5.2 Pipette, of suitable capacity, having a tip opening of diameter approximately 2 mm.6 SamplingCarry out sampling in accordance with one of the methods specified in ISO 123.I
22、NTERNATIONAL STANDARD ISO 2005:2014(E) ISO 2014 All rights reserved 1BS ISO 2005:2014ISO 2005:2014(E)7 ProcedureCarry out the determination in duplicate, using the two centrifuge tubes (5.1) to counterbalance each other. Into each tube weigh, to the nearest 0,1 g, between 40 g and 45 g of latex conc
23、entrate.Treat each tube as follows. Cover the end of the tube to prevent formation of a surface skin during centrifuging, and centrifuge for 20 min at a mean acceleration of approximately 12 000 m/s2. Scoop off most of the cream layer and, using the pipette (5.2), carefully draw off the supernatant
24、liquid to approximately 10 mm above the top of the sludge. Fill the tube to the top with the ammonia-alcohol solution (4.1), re-centrifuge for 25 min, and pipette off the supernatant liquid to approximately 10 mm above the top of the sludge. Repeat this procedure until the supernatant liquid is clea
25、r after centrifuging. Decant the supernatant solution to the 10 mm mark and transfer the sludge quantitatively, using some of the ammonia-alcohol solution to a tared heat-resistant beaker of about 200 cm3capacity. Evaporate to a low level and then dry at 70 C 5 C, until the loss in mass is less than
26、 1 mg.8 Expression of resultsCalculate the sludge content, as a percentage by mass, using Formula (1):mm10100 (1)wherem0is the mass, in grams, of the test portion;m1is the mass, in grams, of the dried sludge.A difference of less than 0,002 % (by mass) between the two results shall not be considered
27、significant.9 PrecisionSee Annex A.10 Test reportThe test report shall include the following:a) a reference to this International Standard, i.e. ISO 2005:2014;b) all details necessary for identification of the test sample;c) the results and the units in which they were expressed;d) any unusual featu
28、res noted during the determination;e) any operation not included in this International Standard, or in the International Standard to which reference is made, as well as any operation regarded as optional;f) the date of the test.2 ISO 2014 All rights reservedBS ISO 2005:2014ISO 2005:2014(E)Annex A (i
29、nformative) PrecisionA.1 GeneralThe precision of this method was determined in accordance with ISO/TR 9272. Refer to this document for terminology and explanations of statistical concepts.The precision details in this precision statement give an estimate of the precision of this test method with the
30、 materials used in the particular interlaboratory programme as described below. The precision parameters should not be used for acceptance/rejection testing of any group of materials without documentation that the parameters are applicable to those particular materials and the specific test protocol
31、 of this test method.The precision results are given in Table A.1. The precision is expressed on the basis of a 95 % confidence level for the values established for repeatability, r, and reproducibility, R.The results contained in Table A.1 are mean values and give an estimate of the precision of th
32、is test method as determined in an interlaboratory test programme (ITP) conducted in 2012. Six laboratories performed duplicate analyses on two samples, A and B, which were prepared from highly ammoniated latex. The bulk latex was strained and then homogenized by thorough blending and stirring prior
33、 to being sub-sampled into 1-l bottles labelled A and B. Thus, essentially, samples A and B were the same and were treated as such in the statistical computations. Each participating laboratory was required to carry out the test using these two samples on the dates which had been given to the partic
34、ipants in the ITP.A type 1 precision was determined, based on the sampling method used for the latex samples in the ITP.A.2 RepeatabilityThe repeatability, r, (in measurement units) of this test method has been established as the appropriate value tabulated in Table A.1. Two single test results, obt
35、ained in the same laboratory under normal test conditions, that differ by more than the tabulated value of r (for any given level) should be considered to have come from different (non-identical) sample populations.A.3 ReproducibilityThe reproducibility, R, (in measurement units) of this test method
36、 has been established as the appropriate value tabulated in Table A.1. Two single test results, obtained under normal test conditions, that differ by more than the tabulated value of R (for any given level), should be considered to have come from different (non-identical) sample populations.A.4 Bias
37、In test method terminology, bias is the difference between an average test value and the reference (or true) test property value.Reference values do not exist for this test method since the value (of the test property) is exclusively defined by the test method. Bias, therefore, cannot be determined
38、for this particular test method. ISO 2014 All rights reserved 3BS ISO 2005:2014ISO 2005:2014(E)Table A.1 Estimate of precision of determination of sludge contentMean Within-laboratory Between laboratories% (m/m) srr sRR0,006 0,000 7 0,002 0,0024 0,007r = 2,83 srR = 2,83 sRr is the repeatability (in
39、measurement units)sris the within-laboratory standard deviationR is the reproducibility (in measurement units)sRis the between-laboratories standard deviation4 ISO 2014 All rights reservedBS ISO 2005:2014ISO 2005:2014(E)Bibliography1 ISO/TR 9272, Rubber and rubber products Determination of precision
40、 for test method standards ISO 2014 All rights reserved 5BS ISO 2005:2014ISO 2005:2014(E) ISO 2014 All rights reservedICS 83.040.10Price based on 5 pagesThis page deliberately left blankBSI is the national body responsible for preparing British Standards and other standards-related publications, inf
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