BS-6057-2-1987 ISO-123-1985.pdf
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1、BRITISH STANDARD BS 6057-2: 1987 ISO 123:1985 Rubber latices Part 2: Sampling ISO title: Rubber latex Sampling NOTEAttention is drawn to BS 6057-0 “General introduction” issued separately. UDC 678.031:620.113.42 Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 15:21:13 GMT+00:00 2006, Uncontro
2、lled Copy, (c) BSI BS 6057-2:1987 This British Standard, having been prepared under the direction of the Rubber Standards Committee, was published under the authority of the Board of BSI and comes into effect on 30 September 1987 BSI 10-1999 The Committees responsible for this British Standard are s
3、hown in Part 0 The following BSI references relate to the work on this standard: Committee reference RUM/38 Draft for comment 84/36676 DC ISBN 0 580 16025 4 National foreword This Part of BS 6057 is identical with ISO 123:1985 “Rubber latex Sampling” published by the International Organization for S
4、tandardization (ISO). It supersedes clause 2 of BS 1672:1972 and clause 3 of BS 3397:1976 which are being deleted by separate amendments. Terminology and conventions. The text of the International Standard has been approved as suitable for publication as a British Standard without deviation. Some te
5、rminology and certain conventions are not identical with those used in British Standards; attention is drawn especially to the following. Wherever the words “International Standard” or “second edition of ISO 123” appear, referring to this standard, they should be read as “Part of BS 6057”. The comma
6、 has been used as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. The Technical Committee has reviewed the provisions of ISO 3310-1:1982 to which reference is made in the text, and has decided that they are acceptable for use i
7、n conjunction with this standard. Attention is drawn to BS 410 “Specification for test sieves” which is related to ISO 3310-1. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Complian
8、ce 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, pages i and ii, pages 1 to 4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have h
9、ad amendments incorporated. This will be indicated in the amendment table on the inside front cover. Cross-references International StandardCorresponding British Standard ISO 124:1974BS 6057 Rubber latices Section 3.2:1981 Determination of total solids content of rubber latices (Identical) ISO 1795:
10、1974BS 6315:1982 Methods for sampling and sample preparation of raw rubber (Technically equivalent) Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 15:21:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6057-2:1987 BSI 10-1999i
11、 Contents Page National forewordInside front cover 0Introduction1 1Scope and field of application1 2References1 3Definitions1 4Principle1 5Apparatus1 6Sampling2 7Labelling of laboratory sample and the test sample3 8Test report3 Figure Sampling tube for drums, tank cars and smaller tanks (not to scal
12、e)4 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 15:21:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 15:21:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6057-2:1987 BSI 10-19991 0 I
13、ntroduction This second edition of ISO 123 gives more precise definitions, specifies the apparatus in more detail and clarifies some ambiguity on preliminary testing. The method of homogenizing latex in drums fitted with bungs has been altered, and in order to safeguard against stratification closer
14、 agreement in total solids content is required between samples drawn from different levels. 1 Scope and field of application This International Standard specifies procedures for the sampling of natural rubber latex concentrate containing preservative agents and also for the sampling of synthetic rub
15、ber latices. It is suitable for the sampling of rubber latex that is contained in drums, tank cars, or tanks. 2 References ISO 124, Rubber latices Determination of total solids content. ISO 1795, Raw rubber in bales Sampling. ISO 3310-1, Test sieves Technical requirements and testing Part 1: Test si
16、eves of metal wire cloth. 3 Definitions For the purpose of this International Standard, the following definitions apply. 3.1 lot a definite quantity of latex processed or produced under conditions which are presumed uniform, from which a test sample (see 3.4) is required the lot may be in one or mor
17、e containers or vessels, for example it may consist of several drums of the same latex 3.2 sample any quantity of latex that is drawn from the lot 3.3 laboratory sample a quantity of latex intended for laboratory inspection and testing and that is representative of the lot 3.4 test sample a quantity
18、 of the latex that is suitable for testing obtained by filtering the laboratory sample NOTEThe laboratory sample, not the test sample, is used for the determination of coagulum content. 4 Principle The latex is agitated thoroughly to obtain a homogeneous bulk. A representative sample (3.3) is taken
19、from the bulk of the latex. The test sample (3.4) is prepared from the laboratory sample (3.3). 5 Apparatus 5.1 Stirrer, for homogenization of latex in drums. For open-headed drums, use either 5.1.1 or 5.1.2. For drums fitted with a bung, use 5.1.3. 5.1.1 Perforated stainless steel disk plunger, of
20、diameter approximately 150 mm, with holes of diameter approximately 10 mm. 5.1.2 Motor-driven stirrer, with a rotational frequency of 100 to 700 r/min. A suitable type of stirrer consists of a collapsible two-bladed stainless steel propeller of 110 mm minimum diameter when fully opened, mounted on a
21、 stainless steel shaft sufficiently long for the propeller to be at a distance of about one-tenth the height of the latex from the bottom of the drum. If desired, two propellers may be used on the same shaft, in which case the lower one shall meet the foregoing requirements as regards position. The
22、shaft speed shall give a brisk turnover without creating a vortex. The part of the equipment immersed in the latex shall not contain copper. 5.1.3 Motor-driven drum roller, capable of rotating a drum at approximately 10 r/min. 5.2 Sampling tubes for latex in drums Use either 5.2.1 or 5.2.2. 5.2.1 Gl
23、ass tube, of internal diameter 10 to 15 mm and length at least 1 m, open at both ends and having a stopper for closing the tube while withdrawing the latex. 5.2.2 Stainless steel sampling tube, of internal diameter approximately 25 mm and length at least 1 m, the bottom of which can be opened or clo
24、sed by remote control. An outline drawing of a suitable design is given in the Figure. 5.3 Sampling devices for latex in tank cars or tanks Use 5.3.1 for sampling latex the depth of which is 3 m or more. Use either 5.3.2 or 5.3.1 for sampling latex the depth of which is less than 3 m. Licensed Copy:
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