1、May 2017 English price group 7No 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).ICS 83.040.10!%eB“2663199www.din.deDIN IS
2、O 2005Rubber latex, natural, concentrate Determination of sludge content (ISO 2005:2014),English translation of DIN ISO 2005:2017-05NaturkautschukLatexKonzentrat Bestimmung des Gehaltes an Bodensatz (ISO 2005:2014),Englische bersetzung von DIN ISO 2005:2017-05Latex concentr de caoutchouc naturel Dte
3、rmination de la teneur en sdiment (ISO 2005:2014),Traduction anglaise de DIN ISO 2005:2017-05SupersedesDIN ISO 2005:200806www.beuth.deDocument comprises 10 pagesDTranslation by DIN-Sprachendienst.In case of doubt, the German-language original shall be considered authoritative.06.17 DIN ISO 2005:2017
4、-05 2 A comma is used as the decimal marker. Contents Page National foreword . 3 National Annex NA (informative) Bibliography 4 Foreword 5 1 Scope 6 2 Normative references 6 3 Principle . 6 4 Reagents . 6 5 Apparatus . 6 6 Sampling . 6 7 Procedure. 7 8 Expression of results 7 9 Precision . 7 10 Test
5、 report . 7 Annex A (informative) Precision 8 Bibliography . 10 DIN ISO 2005:2017-05 National foreword This document (ISO 2005) has been prepared by Technical Committee ISO/TC 45 “Rubber and rubber products”, Subcommittee SC 3 “Raw materials (including latex) for use in the rubber industry”. The res
6、ponsible German body involved in its preparation was DIN-Normenausschuss Materialprfung (DIN Standards Committee Materials Testing), Working Committee NA 062-04-35 AA “Raw materials (including latex) for use in the rubber industry”. Attention is drawn to the possibility that some of the elements of
7、this document may be the subject of patent rights. DIN shall not be held responsible for identifying any or all such patent rights. In deviation from the method described in the standard, significantly more sediment can be obtained (up to factor 2) by longer centrifuging. The responsible German body
8、 recommends supplementing the last paragraph of Clause 7 “Procedure” by a drying time of at least 30 min to verify the constant mass. The DIN Standard corresponding to the International Standard referred to in this document is as follows: ISO 123 DIN ISO 123 Amendments This standard differs from DIN
9、 ISO 2005:2008-06 as follows: a) in the last paragraph of Clause 7, the time interval of 30 min for the mass lost has been deleted and the temperature has been changed from (70 null 2) C to (70 null 5) C; b) the precision statement has been updated according to the interlaboratory test from 2012 and
10、 has been transferred to Annex A (informative); c) a Bibliography has been included. Previous editions DIN 53592: 1971-04 DIN ISO 2005: 1996-01, 2008-06 3 DIN ISO 2005:2017-05 National Annex NA (informative) Bibliography DIN ISO 123, Rubber latex Sampling 4 ForewordISO (the International Organizatio
11、n 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 member body interested in a subject for which a technical committee has been established has
12、 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 International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The pr
13、ocedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the edito
14、rial 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 may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent right
15、s 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/patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explan
16、ation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT), see the following URL: Foreword Supplementary information .The committee responsible for this docum
17、ent 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 and replaces the third edition (ISO 2005:1992), which has been technically revised. It also incorporates the amendment ISO 2005:1992/Amd1:2006.T
18、he 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 the loss in mass was deleted; the precision statement was updated following an interlaboratory test programme conducted in 2012; it was moved to
19、 informative Annex A; a Bibliography was added.DIN ISO 2005:2017-05 5 1 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 brasili
20、ensis.It is not suitable for compounded latex or vulcanized latex.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, t
21、he latest edition of the referenced document (including any amendments) 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, us
22、e only reagents of recognized analytical grade and only distilled 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
23、laboratory apparatus and the following.5.1 Centrifuge, producing a 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 sam
24、pling in accordance with one of the methods specified in ISO 123.Rubber latex, natural, concentrate Determination of sludge content DIN ISO 2005:2017-05 6 N1) National footnote: This density corresponds to an ammonia solution with a mass of approximately 25 %. N1)7 ProcedureCarry out the determinati
25、on 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 concentrate.Treat each tube as follows. Cover the end of the tube to prevent formation of a surface skin during centrifuging, and centrifuge
26、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 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-centrifug
27、e 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 clear after centrifuging. Decant the supernatant solution to the 10 mm mark and transfer the sludge quantitatively, using some of the ammonia
28、-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 1 mg.8 Expression of resultsCalculate the sludge content, as a percentage by mass, using Formula (1):mm10100 (1)wherem0is the mass, in g
29、rams, 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 significant.9 PrecisionSee Annex A.10 Test reportThe test report shall include the following:a) a reference to this International Standar
30、d, 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 features noted during the determination;e) any operation not included in this International Standard, or in the International Standard to whic
31、h reference is made, as well as any operation regarded as optional;f) the date of the test.DIN ISO 2005:2017-05 7 Annex A (informative) PrecisionA.1 GeneralThe precision of this method was determined in accordance with ISO/TR 9272. Refer to this document for terminology and explanations of statistic
32、al concepts.The precision details in this precision statement give an estimate of the precision of this test method with the 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 mat
33、erials without documentation that the parameters are applicable to those particular materials and the specific test protocol 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 repeatabili
34、ty, r, and reproducibility, R.The results contained in Table A.1 are mean values and give an estimate of the precision of this 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 pre
35、pared from highly ammoniated latex. The bulk latex was strained and then homogenized by thorough blending and stirring prior 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 partici
36、pating laboratory was required to carry out the test using these two samples on the dates which had been given to the participants 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 u
37、nits) of this test method has been established as the appropriate value tabulated in Table A.1. Two single test results, obtained 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 differ
38、ent (non-identical) sample populations.A.3 ReproducibilityThe reproducibility, R, (in measurement units) of this test method 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 va
39、lue of R (for any given level), should be considered to have come from different (non-identical) sample populations.A.4 BiasIn 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 met
40、hod since the value (of the test property) is exclusively defined by the test method. Bias, therefore, cannot be determined for this particular test method.DIN ISO 2005:2017-05 8 Table A.1 Estimate of precision of determination of sludge contentMean Within-laboratory Between laboratories% (m/m) srr
41、sRR0,006 0,000 7 0,002 0,0024 0,007r = 2,83 srR = 2,83 sRr is the repeatability (in measurement units)sris the within-laboratory standard deviationR is the reproducibility (in measurement units)sRis the between-laboratories standard deviationDIN ISO 2005:2017-05 9 Bibliography1 ISO/TR 9272, Rubber and rubber products Determination of precision for test method standardsDIN ISO 2005:2017-05 10
