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1、INTERNATIONAL STANDARD ISO 123 Third edition 2001-05-15 Reference number ISO 123:2001(E) ISO 2001 Rubber latex Sampling Latex de caoutchouc chantillonnage Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 No
2、t for Resale, 04/22/2007 08:47:39 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 123:2001(E) ii ISO 2001 All rights reserved PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but
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7、so.ch Web www.iso.ch Printed in Switzerland Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 08:47:39 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO
8、 123:2001(E) ISO 2001 All rights reserved iii ContentsPage 1Scope .1 2Normative references .1 3Terms and definitions 1 4Principle 2 5Apparatus .2 6Sampling .3 7Labelling the laboratory sample and the test sample .7 8Sampling report 8 Copyright International Organization for Standardization Provided
9、by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 08:47:39 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 123:2001(E) iv ISO 2001 All rights reserved Foreword 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 com- mittees. Each member body interested in a subject for which a technical committee has been established has the right to be rep
11、resented on that committee. International organizations, governmental and non-governmental, in liai- son 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
12、 are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies castin
13、g a vote. Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. International Standard ISO 123 was prepared by Technical Committee ISO/TC 45,
14、Rubber and rubber products, Subcommittee SC 3,Raw materials (including latex) for use in the rubber industry. This third edition cancels and replaces the second edition (ISO 123:1985), which has been technically revised. The principal differences lie in more precise definitions and specifications fo
15、r the frequency of sampling. In addition, the method of homogenizing and sampling latex in drums fitted with bungs has been modified to take account of practical considerations. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical St
16、andards 1/9972545001 Not for Resale, 04/22/2007 08:47:39 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARDISO 123:2001(E) ISO 2001 All rights reserved 1 Rubber latex Sampling WARNING Persons using this International Standard should be familiar with norm
17、al 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. 1Scope This Inter
18、national Standard specifies procedures for sampling natural rubber latex concentrate and for sampling syn- thetic rubber latices and artificial latices. It is also suitable for sampling rubber latex contained in drums, tank cars or tanks. The procedures may also be used for sampling plastics dispers
19、ions. 2Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publica- tions do not apply. However, parties to
20、 agreements based on this International Standard are encouraged to investi- gate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain
21、reg- isters of currently valid International Standards. ISO 124:1997,Latex, rubber Determination of total solids content. ISO 706:1985,Rubber latex Determination of coagulum content (sieve residue). ISO 3310-1:2000,Test sieves Technical requirements and testing Part 1: Test sieves of metal wire clot
22、h. ISO 15528:2000,Paints, varnishes and raw materials for paints and varnishes Sampling. 3Terms and definitions For the purposes of this International Standard, the following terms and definitions apply. 3.1 lot a definite quantity of latex processed or produced under conditions which are presumed u
23、niform NOTEA lot may be in one or more containers or vessels. For example, it may consist of several drums of latex. 3.2 sample a quantity of latex that has been drawn from a lot 3.3 laboratory sample a quantity of latex intended for laboratory inspection and testing and that is representative of th
24、e lot Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 08:47:39 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 123:2001(E) 2 ISO 2001 All rights res
25、erved 3.4 test sample a quantity of latex suitable for testing, obtained by straining the laboratory sample NOTEThe laboratory sample, not the test sample, is used for the determination of coagulum content (see 6.5.5). 3.5 test portion a quantity of latex taken from the test sample (3.4) or laborato
26、ry sample (3.3), for the purpose of a single specific test, for example the amount actually weighed out from the test sample for a single determination of total solids content 3.6 coagulum content/sieve residue coarse foreign matter and flocculated rubber retained under the conditions of the test (I
27、SO 706) on a filter with aver- age aperture width ofcomplying with ISO 3310-1 NOTEIn the context of examination of latex shipments, bulk deliveries, etc., this is what is generally understood by “coagulum”. Pieces of latex skin and coagulated rubber should not be included in the laboratory sample. 4
28、Principle A representative laboratory sample is taken from the bulk of the latex. The test sample is prepared by straining the laboratory sample. 5Apparatus No part of the equipment to be immersed in the latex shall contain copper. 5.1Stirrer, for homogenization of latex in drums. For open-headed dr
29、ums, use either 5.1.1 or 5.1.2. For drums fitted with a bung, see 6.4.1.4. 5.1.1Plunger, consisting of a perforated, chrome-plated or stainless-steel disc of diameter approximately, with smooth-edged holes of diameter approximately. 5.1.2Motor-driven stirrer, capable of operating at a speed ofto(to)
30、. A suitable type of motor-driven stirrer consists of a stainless-steel propeller ofminimum diameter, mounted on a stainless-steel shaft sufficiently long for the propeller to be at a distance of about one-tenth the depth of the latex from the bottom of the drum. If desired, two propellers may be us
31、ed on the same shaft, in which case the lower one shall meet the foregoing re- quirements as regards position. The rotational frequency shall be such as to give a brisk turnover without creating a vortex. 5.1.3Motor-driven drum roller (optional, see 6.4.1.5), capable of rotating a drum at approximat
32、ely (). 5.2Sampling devices, suitable for the removal of an approximatelyrepresentative sample from a known depth in the latex. Such devices shall be constructed of materials inert to latex. 5.2.1Sampling tubes for latex in drums Use either 5.2.1.1 or 5.2.1.2. 5.2.1.1Sampling tube, of material inert
33、 to the latex, such as glass, stainless steel or inert plastic, having an inter- nal diameter oftoand a length of at least, open at both ends and having a stopper for closing the upper end while withdrawing it from the latex. 180m10m 150 mm 10 mm 5 rad/s21 rad/s 50 r/min200 r/min 110 mm 1 rad/s 10 r
34、/min 1 dm3 10 mm15 mm1 m Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 08:47:39 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 123:2001(E) ISO 20
35、01 All rights reserved 3 NOTEInserting a tube open at both ends into the latex effectively provides a cross-section of the latex at all depths as a sample. 5.2.1.2Sampling tube, stainless steel, of internal diameter approximatelyand length at least, the bot- tom of which can be opened or closed by r
36、emote control. A drawing of a suitable device is given in Figure 1. 5.2.2Sampling devices for latex in tank cars or tanks Use 5.2.2.1 if the depth of the latex isor more. Use either 5.2.2.1 or 5.2.2.2 if the depth is less than. 5.2.2.1Cylindrical stainless-steel vessel, of capacity approximately, cl
37、osed by a lid or bung that can be opened by remote control. Such a vessel may be rigidly mounted for insertion to the required depth. A device similar to that shown in Figure 2 is suitable. A variety of other suitable devices for sampling are given in ISO 15528. 5.2.2.2Sampling tube, stainless steel
38、, of internal diameter, similar to 5.2.1.2 but length, the bottom of which can be opened or closed by remote control. 5.3Beakers, of capacity, to receive the latex from the sampling tube or vessel. The beakers shall be shock- resistant and have a smooth inner surface that is chemically inert to late
39、x. 5.4Sample bottles, of capacity, with screw caps. The bottles shall have a smooth inner surface and be made of material that is chemically resistant to latex. Glass and some types of plastic are suitable materials. Thin flexible containers shall not be used. NOTEFor purposes of trans-shipment, nar
40、row-necked containers with a deep thread are preferable. 5.5Filter, of stainless-steel wire or synthetic cloth inert to latex, with an average aperture width of , complying with ISO 3310-1. 6Sampling 6.1General At all stages of sampling, avoid introducing air into the latex and keep exposure of the
41、latex to air to a minimum. 6.2Frequency of sampling 6.2.1Unless otherwise agreed, sampling shall be carried out at the frequency specified in 6.2.2 and 6.2.3. 6.2.2Every lot shall be sampled. 6.2.3Where a lot has been divided between a number of distinct containers (e.g. drums), samples shall be tak
42、en fromof the containers with a minimum of one and rounded up to the nearest whole number (i.e. two from twelve, seven from sixty-four, etc.). Select the containers from which the samples are to be withdrawn at random throughout the consignment. 6.3Preliminary examination Examine the latex visually,
43、 and record the presence of creaming, gross coagulum, skin and foreign matter. 25 mm1 m 3 m3 m 1 dm3 25 mm3 m 2 dm3 1 dm3 180m10m 10 % Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/
44、2007 08:47:39 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 123:2001(E) 4 ISO 2001 All rights reserved Key 1Handle 2Spring 3Tube 4Guides for valve rod 5Simple valve Figure 1 Sampling tube for drums, tank cars and smaller tanks (not to scale) Copyright International Or
45、ganization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 08:47:39 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 123:2001(E) ISO 2001 All rights reserved 5 Key 1Handle (manual compre
46、ssion opens lid) 2Rods 3Lid 4Container of appropriate size a Suitable length for taking sample Construction material: stainless steel Figure 2 Example of a latex-sampling device Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical St
47、andards 1/9972545001 Not for Resale, 04/22/2007 08:47:39 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 123:2001(E) 6 ISO 2001 All rights reserved 6.4Sampling from drums 6.4.1Homogenization 6.4.1.1Homogenize the latex manually as specified in 6.4.1.2 or mechanically as
48、 specified in 6.4.1.3 or, if appropri- ate, by means of a drum roller as specified in 6.4.1.5. 6.4.1.2If the drum is of the open-head type, remove the end head and agitate the contents for at least, pref- erably by means of a perforated stainless-steel plunger (5.1.1). 6.4.1.3Alternatively, agitate the contents of the drum by means of the motor-driven stirrer (5.1.2) forto ho- mogenize the latex. Avoid excessive stirring. 6.4.1.4I