BS-6057-3.13-1993 ISO-2005-1992.pdf
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1、BRITISH STANDARD BS 6057-3.13: 1993 ISO 2005:1992 Incorporating Amendment No. 1 Rubber latices Part 3: Methods of test Section 3.13 Determination of sludge content NOTE Attention is drawn to BS 6057-0 “General introduction”, issued separately ICS 83.040.10 Licensed Copy: sheffieldun sheffieldun, na,
2、 Wed Dec 06 15:23:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6057-3.13:1993 This British Standard, having been prepared under the direction of the Plastics and Rubber Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 January 1993 B
3、SI 2006 First published January 1984 Second edition December 1987 Third edition January 1993 The following BSI references relate to the work on this standard: Committee reference PRM/51 Draft announced in BSI News, February 1991 ISBN 0 580 21511 3 Committees responsible for this British Standard The
4、 preparation of this British Standard was entrusted by the Plastics and Rubber Standards Policy Committee (PRM/-) to Technical Committee PRM/51, upon which the following bodies were represented: British Rubber Manufacturers Association Malaysian Rubber Producers Research Association Medical Sterile
5、Products Association Tropical Growers Association Amendments issued since publication Amd. No.DateComments 1624328 April 2006See national foreword Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 15:23:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6057-3.13:1993 BSI 2006i Contents Page Comm
6、ittees responsibleInside front cover National forewordii 1Scope1 2Normative reference1 3Principle1 4Reagents1 5Apparatus1 6Sampling1 7Procedure1 8Expression of results1 9Precision statement1 10Test report2 Table 1 Estimate of precision of determination of sludge content2 List of references3 Licensed
7、 Copy: sheffieldun sheffieldun, na, Wed Dec 06 15:23:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6057-3.13:1993 ii BSI 2006 National foreword This Section of BS 6057 has been prepared under the direction of the Plastics and Rubber Standards Policy Committee and is identical with ISO 2005:1992 R
8、ubber latex, natural, concentrate Determination of sludge content, including amendment 1:2006, published by the International Organization for Standardization (ISO). It supersedes BS 6057-3.13:1987, which is withdrawn. The start and finish of text introduced or altered by ISO amendment is indicated
9、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 !“. Cross-reference International StandardCorresponding British Standard ISO 123:1985BS 6057 Rubber latices Part 2:1987 Sampling This public
10、ation does not purport to include all the necessary provisions of a cntract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover,
11、 pages i and ii, pages 1 to 3 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+00:00 2006, Uncon
12、trolled Copy, (c) BSI BS 6057-3.13:1993 BSI 20061 1 Scope This 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 s
13、uitable for compounded latex or vulcanized latex. 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the edition indicated was valid. All standards are subject to re
14、vision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. !ISO 123:2001“, Rubber latex
15、 Sampling. !ISO/TR 9272, Rubber and rubber products Determination of precision for test method standards.“. 3 Principle A test portion is centrifuged and the resultant sludge washed repeatedly with ammonia-alcohol solution. The sludge is then dried to constant mass. 4 Reagents During the analysis, u
16、se 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: 5 Apparatus Ordinary laboratory apparatus and 5.1 Centrifuge, producing a mean acceleration of approximately 12 000 m/s2, with
17、two 50 cm3 conical centrifuge tubes. 5.2 Pipette, of suitable capacity, having a tip opening of diameter approximately 2 mm. 6 Sampling Carry out sampling in accordance with one of the methods specified in ISO 123. 7 Procedure Carry out the determination in duplicate, using the two centrifuge tubes
18、(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 for 20 min at a mean acceleration of approxima
19、tely 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), recentrifuge for 25 min, and pipette off the supernatant l
20、iquid 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-alcohol solution to a tared heat-resistant bea
21、ker of about 200 cm3 capacity. Evaporate to a low level and then dry at 70 C 2 C, until the loss in mass is less than 1 mg during a period of 30 min. 8 Expression of results Calculate the sludge content, as a percentage by mass, using the formula where A difference of 0,002 % (m/m) between the two r
22、esults shall not be considered significant. !9 Precision statement 9.1 The precision of this method was determined in accordance with ISO/TR 9272. Refer to this document for terminology and explanations of statistical concepts. 9.2 The precision details in this precision statement give an estimate o
23、f 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 materials without documentation that the parameters are applicable to those particu
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