1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Rapid-plastimeter methodICS 83.060Rubber, unvulcanized Determination of plasticity BRITISH STANDARD
2、BS ISO 2007:2007BS ISO 2007:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August 2007 BSI 2007ISBN 978 0 580 58700 9Amendments issued since publicationAmd. No. Date Commentscontract. Users are responsible for its correct application.
3、Compliance with a British Standard cannot confer immunity from legal obligations.National forewordThis British Standard is the UK implementation of ISO 2007:2007. It supersedes BS 903-A59-59.1:1997 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee PRI/2
4、2, Physical testing of rubber.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a Reference numberISO 2007:2007(E)INTERNATIONAL STANDARD ISO2007Fourth edition2007-06-15Rubber,
5、 unvulcanized Determination of plasticity Rapid-plastimeter method Caoutchouc non vulcanis Dtermination de la plasticit Mthode au plastomtre rapide BS ISO 2007:2007ii iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO memb
6、er 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 represented on that committee. International organizations, government
7、al 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 are drafted in accordance with the rules given in the ISO/IEC Direct
8、ives, 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 International Standard requires approval by at least 75 % of the member bodie
9、s 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. ISO 2007 was prepared by Technical Committee ISO/TC 45, Rubber and rubber products,
10、 Subcommittee SC 2, Testing and analysis. This fourth edition cancels and replaces the third edition (ISO 2007:1991), which has been revised to update the normative references (ISO 1796 has been replaced by ISO 1795). In addition, the details of the supplier of standard rubber have been deleted from
11、 Clause 6 and the text has been clarified in places. BS ISO 2007:2007blank1Rubber, unvulcanized Determination of plasticity Rapid-plastimeter method WARNING Persons using this International Standard should be familiar with normal laboratory practice. This standard does not purport to address all of
12、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. CAUTION Certain procedures specified in this International Standard may involve the use or
13、 generation of substances, or the generation of waste, that could constitute a local environmental hazard. Reference should be made to appropriate documentation on safe handling and disposal after use. 1 Scope This International Standard specifies a method for the rapid determination of the plastici
14、ty of raw rubber and unvulcanized compounded rubber. It is applicable to the determination of the plasticity retention index (PRI) as specified in ISO 2930, Rubber, raw natural Determination of plasticity retention index (PRI). 2 Normative references The following referenced documents are indispensa
15、ble for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 1795, Rubber, raw natural and raw synthetic Sampling and further preparative procedures 3 Prin
16、ciple A disc-shaped test piece is compressed rapidly between small parallel platens to a fixed thickness of 1 mm. The test piece is maintained at this compression for 15 s to enable it to reach approximate temperature equilibrium with the platens. After this period, the test piece is subjected to a
17、constant compressive force of 100 1 N for 15 s. Its thickness at the end of this period is taken as the measure of plasticity. 4 Apparatus 4.1 Parallel-plate plastimeter, consisting of the following elements: 4.1.1 Two parallel, circular platens, having smooth, flat surfaces, movable in relation to
18、each other, both provided with suitable means of heating, and a jacket so that the material being tested and the area surrounding it can be maintained at the specified test temperature. One of the two platens shall be a right cylinder of stainless steel and shall have one of the following diameters:
19、 7,30 mm, 10,00 mm or 14,00 mm (tolerance 0,02 mm), its effective depth shall be 4,50 mm 0,15 mm and care shall be taken to ensure that the edge of the working face is neither worn nor damaged. The diameter shall be selected so that the measured plasticity (see Clause 9) lies between 20 and 85. The
20、other platen can be of chromium-plated brass or stainless steel and shall be of a larger diameter than the first platen. Its effective depth of inclusion within any heating jacket shall be 3,50 mm 0,25 mm. BS ISO 2007:20072 4.1.2 Means for moving one or other of the two platens normal to its surface
21、, to compress the test piece to a thickness of 1,00 mm 0,01 mm. The mode of movement of the platen and the forces applied in this operation shall be such that, with or without the test piece in place, the movement is always completed within a period of 2 s. A force of at least 300 N is required and
22、can be conveniently provided by springs. 4.1.3 Means of applying to one or other platen a test force of 100 1 N normal to its surface to compress the test piece. 4.1.4 Means for indicating the thickness of the test piece to the nearest 0,01 mm when it is between the platens. 4.1.5 Timing device, so
23、that the test can be timed in seconds to an accuracy of 0,2 s. 4.2 Punch, capable of producing test pieces of approximately constant volume quickly and without difficulty. The punch shall consist of a flat-ended cylindrical anvil and a coaxial tubular knife, moving independently of one another. A si
24、ngle action of the handle shall compress a portion of the material to a thickness of approximately 3 mm and shall cut out a disc of approximately 13 mm diameter. The test piece need only be approximately constant in volume because the final shaping to exact dimensions is carried out in the instrumen
25、t during the pre-heating period. 4.3 Bleached, unglazed, acid-free tissue paper, of approximately 17 g/m2. For interlaboratory testing, paper from the same source shall be used. 5 Test piece Raw rubber shall be homogenized when comparative tests are to be carried out. The preparation and homogenizat
26、ion of the sample shall be carried out in accordance with the provisions of ISO 1795. The test piece shall be a disc of rubber approximately 13 mm in diameter and approximately 3 mm thick, having a volume of 0,40 cm3 0,04 cm3. If the specified thickness is attained by compressing an initially thicke
27、r sheet, the latter shall be not more than 4 mm thick. 6 Calibration The settings of the rapid plastimeter shall be checked against the makers instructions. The loading spring shall be recalibrated (at 100 N 1 N) every 6 weeks, and the timing unit (pre-heating time 1015+s and test period 15 s 0,2 s)
28、 every 4 weeks. The position of the top platen shall be checked before each test. A sample of standard butyl rubber can be used to check whether the machine is in working order. The test pieces shall in this case be prepared from a sheet approximately 3 mm thick, cut from the standard butyl rubber s
29、ample. 7 Temperature of test Unless otherwise stated, the test shall be carried out at 100 C 1 C. 8 Procedure Place two pieces of tissue paper (4.3), each measuring 35 mm 35 mm, between the heated platens (4.1.1) and set the thickness-measuring device (4.1.4) to zero when the platens are closed. Ins
30、ert the test piece centrally between the two pieces of tissue paper, and place the whole between the heated platens. Compress the test piece to a thickness of 1,00 mm 0,01 mm with the platen-moving device (4.1.2), and hold it in the compressed state for a pre-heating period of 1015+s. BS ISO 2007:20
31、073On completion of the pre-heating period, apply a test force of 100 N 1 N to the movable platen for a period of 15 s 0,2 s with the force-application device (4.1.3). At the end of this time, measure the thickness of the test piece. Take the reading of thickness at the moment the 15 s test period i
32、s completed. On models with electronic digital read-out, the measurement will be held until the instrument is re-set. On instruments with dial gauge read-out, the reading shall be taken immediately before any drop-back occurs, and before the locking mechanism operates. 9 Expression of results The me
33、dian value of the thickness of three test pieces at the end of the 15 s compression period, expressed in hundredths of a millimetre, shall be taken as the plasticity number. 10 Test report The test report shall include the following information: a) sample details: 1) a full description and identific
34、ation of the sample tested and its origin, 2) details of test piece preparation, for example the milling procedure used (see ISO 1795), 3) details of compounded rubbers, if applicable; b) test method: 1) a reference to this International Standard, 2) any special data concerning the apparatus; c) tes
35、t details: 1) the size of platen used (as given in 4.1.1), 2) the temperature of test; d) the test result, i.e. the plasticity number, expressed as specified in Clause 9; e) the date of the test. BS ISO 2007:2007BS ISO BSI389 Chiswick High RoadLondonW4 4AL2007:2007BSI British Standards InstitutionBS
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