BS-6057-3.9-1996 ISO-976-1996.pdf
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1、? BRITISH STANDARD BS 6057-3.9: 1996 ISO 976:1996 Incorporating Amendment No. 1 Rubber latices Part 3: Methods of test Section 3.9 Determination of pH ICS 83.060 Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 15:23:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6057-3.9:1996 This British S
2、tandard, 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 October 1996 BSI 2006 First published February 1981 Second edition August 1990 Third edition October 1996 The follow
3、ing BSI references relate to the work on this standard: Committee reference PRI/51 Draft for comment 94/306666 DC ISBN 0 580 26414 9 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 1624728 April 2006See national foreword Licensed Copy: sheffieldun sheffieldun, na, Wed
5、 Dec 06 15:23:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6057-3.9:1996 BSI 2006i Contents Page Committees responsibleInside front cover National forewordii 1Scope1 2Normative references1 3Reagents1 4Apparatus2 5Sampling2 6Procedure2 7Expression of results4 8Precision statement4 9Test report5 F
6、igure 1 Typical combined electrode3 Table 1 Estimate of precision of determination of pH4 List of referencesInside back cover Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 15:23:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6057-3.9:1996 ii BSI 2006 National foreword This Section of BS 6
7、057 has been prepared by Technical Committee PRI/51 and is identical with ISO 976:1996 Rubber and plastics Polymer dispersions and rubber latices Determination of pH, including amendment 1:2006, published by the International Organization for Standardization (ISO). It supersedes BS 6057-3.9:1990 whi
8、ch is withdrawn. The start and finish of text introduced 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 by !“. A British Standard does not purport to
9、 include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Foreword to amendment 1 ISO (the International Organization for Standardization
10、) 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 the right to be repr
11、esented 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. International Standards ar
12、e 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 adopted by the technical committees are circulated to the member bodies for voting. Publication as an Internation
13、al 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 patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Amendment 1 to IS
14、O 976:1996 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. Cross-references Publication referred toCorresponding British Standard ISO 123:1985BS 6057 Rubber latices Part 2:1987 Sampling (Ide
15、ntical) ISO 842:1984BS 4726:1986 Methods for sampling raw materials for paints and varnishes (Identical) ISO 3696:1987BS EN ISO 3696:1995 Water for analytical laboratory use. Specification and test methods (Identical) Summary of pages This document comprises a front cover, an inside front cover, pag
16、es i and ii, pages 1 to 6, an inside back cover and a back cover. This standard has been updated (see copyright date) and 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
17、+00:00 2006, Uncontrolled Copy, (c) BSI BS 6057-3.9:1996 BSI 20061 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
18、the user to establish appropriate safety and health practices and to ensure compliance with any national regulatory conditions. 1 Scope This International Standard specifies a method for the determination of the pH of polymer dispersions and rubber latices (natural and synthetic) by means of a pH-me
19、ter equipped with a combined glass and silver reference electrode. The method is also suitable for prevulcanized latex and compounds containing polymer dispersions or rubber latices, including adhesives. NOTE 1 The accuracy of the method decreases at pH values above 11. Users should note that this e
20、dition of ISO 976 not only represents a revision of the previous edition, but also supersedes ISO 1148:1980, Plastics Aqueous dispersions of polymers and copolymers Determination of pH. This edition represents a harmonized version of the two standards. One of the major changes in this new edition of
21、 ISO 976 is the use of a combined electrode rather than the separate electrodes used in the previous edition, the combined electrode being considered superior to the separate electrodes since the latter are prone to latex deposits blocking the electrolyte junction, thus adversely affecting repeatabi
22、lity. Although older-type twin electrodes are capable of giving accurate results, they should be progressively replaced because of this problem of cleaning and repeatability. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provision
23、s 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 most recent editions of the standards i
24、ndicated below. Members of IEC and ISO maintain registers of currently valid International Standards. !ISO 123:2001, Rubber latex Sampling. ISO 15528:2000, Paints, varnishes and raw materials for paints and varnishes Sampling.“ ISO 3696:1987, Water for laboratory use Specifications and methods of te
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