BS-6057-3.5-1996 ISO-127-1995.pdf
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1、BRITISH STANDARD BS 6057-3.5: 1996 ISO 127:1995 Incorporating Amendment No. 1 Rubber latices Part 3: Methods of test Section 3.5: Determination of KOH number of natural rubber latices ICS 83.060 Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 15:23:57 GMT+00:00 2006, Uncontrolled Copy, (c) BS
2、I BS 6057-3.5:1996 This British Standard, having been prepared under the direction of the Sector Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 June 1996 BSI 2006 First published November 1985 Second edition June 1996 The follo
3、wing BSI references relate to the work on this standard: Committee reference PRI/51 Draft for comment 92/38077 DC ISBN 0 580 25594 8 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee PRI/51, Latex, upon which the following
4、bodies were represented: British Rubber Manufacturers Association Ltd. Malaysian Rubber Producers Research Association Medical Sterile Products Association Amendments issued since publication Amd. No.DateComments 1624428 April 2006 See national foreword Licensed Copy: sheffieldun sheffieldun, na, We
5、d Dec 06 15:23:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6057-3.5:1996 BSI 2006i Contents Page Committees responsibleInside front cover National forewordii Foreword to amendment A1iii 1Scope1 2Normative references1 3Definition1 4Reagents1 5Apparatus1 6Sampling1 7Procedure1 8Expression of resu
6、lts2 9Precision statement2 10Test report3 Annex A (informative) Determination of formaldehyde4 Annex B (informative) Example of a typical titration and calculation of end-point4 Figure B.1 Illustrative curve showing change of pH during titration5 Table 1 Estimate of precision of determination of KOH
7、 number3 Table B.1 Example of a typical filtration to show variation in pH4 List of references6 Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 15:23:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6057-3.5:1996 ii BSI 2006 National foreword This British Standard has been prepared by Technic
8、al Committee PRI/51 and is identical with ISO 127:1995 Rubber, natural latex concentrate Determination of KOH number, including amendment 1:2006, published by the International Organization for Standardization (ISO). It supersedes BS 6057-3.5:1985 which is withdrawn. The start and finish of text int
9、roduced or altered by ISO amendment is indicated in the text by tags !“. Tags indicating changes to ISO text carry the number of the ISO amendment. For example, text altered by ISO amendment 1 is indicated in the text by !“. This publication does not purport to include all the necessary provisions o
10、f a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references Publication referred toCorresponding British Standard ISO 123:1985BS 6057 Rubber latices Part 2:1987 Sampling (Identical) IS
11、O 124:1992Part 3 Methods of test Section 3.2:1992 Determination of total solids content of rubber latices (Identical) ISO 125:1990Section 3.3:1990 Determination of alkalinity of natural rubber latex concentrate (Identical) ISO 976:1986Section 3.9:1990 Determination of pH (Identical) ISO 1802:1992Sec
12、tion 3.12:1992 Determination of boric acid content of natural rubber latex concentrate (Identical) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 6, an inside back cover and a back cover. This standard has been updated (see copyright date) a
13、nd may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 15:23:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6057-3.5:1996 BSI 20061 WARNING Persons using this standard should be famili
14、ar 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 to establish appropriate safety and health practices and to ensure compliance with any national regulatory conditions. 1 Sco
15、pe This International Standard specifies a method for the determination of the KOH number of natural rubber latex concentrate which is preserved wholly or in part with ammonia. The method is applicable to latices containing boric acid. The method is not applicable to latices preserved with potassium
16、 hydroxide. It is not necessarily suitable for latices from natural sources other than Hevea brasiliensis, or for latices of synthetic rubber, compounded latex, vulcanized latex or artificial dispersions of rubber. 2 Normative references The following standards contain provisions which, through refe
17、rence in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the
18、 most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. !ISO 123:2001“, Rubber latex Sampling. !ISO 124:1997“, Rubber latices Determination of total solids content. !ISO 125:2003“, Natural rubber latex concentrate
19、Determination of alkalinity. !ISO 976:1996, Rubber and plastics Polymer dispersions and rubber latices Determination of pH. “ ISO 1802:1985, Natural rubber latex concentrate Determination of boric acid content. !ISO/TR 9272, Rubber and rubber products Determination of precision for test method stand
20、ards. “ 3 Definition For the purposes of this International Standard, the following definition applies. 3.1 KOH number (of latex) the number of grams of potassium hydroxide equivalent to the acid radicals combined with ammonia in latex concentrate containing 100 g of total solids (Definition taken f
21、rom ISO 1382:1982, Rubber Vocabulary/Add.2:1982.) 4 Reagents During the analysis, use only reagents of recognized analytical grade and only distilled water free of dissolved carbon dioxide, or water of equivalent purity. 4.1 Potassium hydroxide, standard volumetric solution, c(KOH) = 0,1 mol/dm3, ca
22、rbonate-free. 4.2 Potassium hydroxide, standard volumetric solution, c(KOH) = 0,5 mol/dm3, carbonate-free. 4.3 Formaldehyde, 45 g to 50 g in 1 dm3 of solution c(HCHO) = 1,5 mol/dm3 to 1,67 mol/dm3, acid-free, prepared by diluting concentrated formaldehyde with water and neutralizing with 0,1 mol/dm3
23、 potassium hydroxide solution (4.1), using as indicator the faint pink colour of phenolphthalein. Determine the concentration of the formaldehyde solution as described in Annex A. 5 Apparatus Standard laboratory glassware, plus the following: 5.1 pH-meter, conforming to ISO 976 but capable of being
24、read to 0,01 units. 5.2 Glass electrode, of a type suitable for use in solutions of pH up to 12,0. 5.3 Mechanical stirrer, with earthed motor and glass paddle, or magnetic stirrer. NOTE 1 An automatic titrator may be used provided it has been checked as giving the same result as the standard method.
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