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1、BRITISH STANDARD BS 5293-8: 1996 ISO 11234: 1995 Sampling and testing carbon black for use in the rubber industry Part 8: Method for determination of dust content ICS 83.040.20 Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:05:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5293-8:1996 T
2、his British Standard, 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 May 1996 BSI 10-1999 The following BSI references relate to the work on this standard: Committee refere
3、nce PRI/53 Draft for comment 94/305025 DC ISBN 0 580 25607 3 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee PRI/53, Carbon black, upon which the following body was represented: British Rubber Manufacturers Association Lt
4、d. Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:05:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5293-8:1996 BSI 10-1999i Contents Page Committees responsibleInside front cover National forewordii Introduction1 1Scope1 2Normati
5、ve references1 3Principle1 4Significance and use1 5Apparatus1 6Procedure2 7Expression of results2 8Test report2 Figure 1 Dust-separation equipment3 List of referencesInside back cover Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:05:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5293-8
6、:1996 ii BSI 10-1999 National foreword This Part of BS 5293 has been prepared by Technical Committee PRI/53 and is identical with ISO 11234:1995 Rubber compounding ingredients Carbon black (pelletized) Determination of dust content, published by the International Organization for Standardization (IS
7、O). The Technical Committee has reviewed the provisions of ISO 383:1976 to which normative reference is made in the text, and has decided that it is acceptable for use in conjunction with this standard. A related British Standard to ISO 383:1976 is BS 572:1985 Specification for interchangeable conic
8、al ground glass joints. 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. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references
9、Publication referred toCorresponding British Standard BS 5293 Sampling and testing carbon black for use in the rubber industry ISO 1124:1988Part 1:1990 Methods of sampling (Identical) ISO 1126:1992Part 5:1992 Method for determination of loss of mass on heating (Identical) Summary of pages This docum
10、ent 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 had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Cop
11、y: sheffieldun sheffieldun, na, Mon Dec 04 16:05:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5293-8:1996 BSI 10-19991 Introduction The fines content of pelletized carbon blacks, as measured in accordance with ISO 1435:1988 Rubber compounding ingredients Carbon black (pelletized) Determination o
12、f fines content, encompasses not only the fines but also any micro-pellets having a diameter of less that 125 4m which may be present. Consequently, ISO 1435 is not specific for the determination of the dust content. Pelletized carbon blacks may contain a considerable proportion of micro-pellets. WA
13、RNING Persons using this International Standard should be familiar with nomal 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 e
14、nsure compliance with any national regulatory conditions. 1 Scope This International Standard specifies a method for determining the dust content of pelletized carbon blacks for use in the industry. This method permits a differentiation to be made between micro-pellets and dust, and is applicable to
15、 all pelletized rubber-grade carbon blacks, more particularly to those pellitized by the dry process which frequently have smaller pellet sizes than their wet-pelletized counterparts. 2 Normative references The following standards contain provisions which, through reference in this text, constitute
16、provisions 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 st
17、andards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 383:1976, Laboratory glassware Interchangeable conical ground joints. ISO 1124:1988, Rubber compounding ingredients Carbon black shipment sampling procedures. ISO 1126:1992, Rubber comp
18、ounding ingredients Carbon black Determination of loss on heating. 3 Principle A test portion of carbon black is fluidized on a sintered-glass filter by means of a gas flow. Dust is carried with the gas flow, is separated from the gas in a cyclone, and is finally weighed. 4 Significance and use The
19、dust content of a carbon black is related to the ability of the product to flow freely and, to a certain extent, its dispersion characteristics. However, in view of the many other variables influencing dispersion and handling, the significance of the dust content must be determined by the user. The
20、dust content can be a relevant parameter in the context of the working-place environment. 5 Apparatus 5.1 Dust-separation equipment, as illustrated in Figure 1, and consisting of the elements described in 5.1.1 to 5.1.4. 5.1.1 Sintered-glass filter, type 0.0 (pore size 250 4m to 500 4m). 5.1.2 Glass
21、 tube, internal diameter 32 mm, mounted vertically. 5.1.3 Glass cyclones 5.1.4 Glass collectors, internal diameter 18 mm. 5.2 Source of dry, oil-free compressed air or nitrogen 5.3 Pressure-regulation valve 5.4 Flowmeter, range 5 dm3/min to 25 dm3/min. 5.5 Analytical balance, sensitivity 0,1 mg. 5.6
22、 Oven, capable of maintaining a temperature of 105 C 2 C or 125 C 2 C. 5.7 Usual ancillary laboratory equipment, including a stopwatch. 5.8 Elements 5.1.1 to 5.1.3 are assembled using two ground-glass connections located at the bottom and the top of tube (5.1.2). Elements 5.1.3 and 5.1.4 (flexibly c
23、onnected by a rubber seal) are only separated for cleaning purposes. The flexible tubing connecting elements 5.4 and 5.1.1 must fit the corresponding outlet and inlet diameters, the other dimensions being immaterial. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:05:02 GMT+00:00 2006, Unc
24、ontrolled Copy, (c) BSI BS 5293-8:1996 2 BSI 10-1999 6 Procedure 6.1 Before starting the determination, connect the filter (5.1.1), the vertical tube (5.1.2) and the cyclone/collector assembly (5.1.3 and 5.1.4) to the source of dry compressed gas (5.2) and, using the pressure-regulation valve (5.3),
25、 adjust the gas flow to 14,4 dm3/min 0,5 dm3/min, which corresponds to a gas speed of 0,30 m/s in the vertical glass tube. 6.2 Cut off the gas supply and disconnect the sintered-glass filter from the vertical glass tube. 6.3 Following the procedure specified in ISO 1126, dry an adequate quantity of
26、the carbon black sample under test for no less than 1 h at 105 C or, better, at 125 C. When the carbon black is completely dry, cool it to ambient temperature in a desiccator and store it there until weighing. 6.4 Weigh out 5 g 0,5 g of the dried carbon black to the nearest 1 mg using the analytical
27、 balance (5.5) and immediately pour this test portion into the sintered-glass filter (5.1.1). 6.5 Connect the sintered-glass filter to the vertical tube. 6.6 Open the gas valve, verify that the gas flow is steady at 14,4 dm3/min, and allow the gas to flow for 5 mins. 6.7 Stop the gas flow, disconnec
28、t the glass cyclones and weigh them to the nearest milligram. 6.8 Clean carefully the cyclones (and collectors), and reweigh them to the nearest milligram. NOTE 1A vacuum cleaner can be useful for cleaning up after this operation. 7 Expression of results Calculate the dust content, expressed as a pe
29、rcentage by mass, using the formula where 8 Test report The test report shall include the following particulars: a) a reference to this International Standard; b) all details necessary to identify the sample; c) the results, rounded to the nearest 0,1 %; d) any unusual features noted during the dete
30、rmination; e) any operation not included in this International Standard or regarded as optional. +10 0 m0is the mass, in grams, of the test portion of dried carbon black; m1is the mass, in grams, of the empty glass cyclones and collectors; m2is the mass, in grams, of the glass cyclones and collector
31、s with the carbon black dust collected. m2m1 m0 - -100 Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:05:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5293-8:1996 BSI 10-19993 Key: 5.1.1Sintered-glass filter 5.1.2Glass tube 5.1.3Glass cyclone 5.1.4Glass collector 5.3Pressure-regulation
32、 valve 5.4Flowmeter NOTEAll ground-glass joints shall conform to ISO 383. Figure 1 Dust-separation equipment Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:05:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 4 blank Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:05:02 GMT+00:00 20
33、06, Uncontrolled Copy, (c) BSI BS 5293-8:1996 BSI 10-1999 List of references See national foreword. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:05:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5293-8: 1996 ISO 11234: 1995 BSI 389 Chiswick High Road London W4 4AL BSI British Standard
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