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 83.040.20BS5293-8:1996 This British Standard, having been prepared under the directionof the Sector Board forMaterials and Chemicals,
2、 waspublished under the authorityof the Standards Boardand comes into effect on 15May1996 BSI 10-1999 The following BSI references relate to the work on this standard: Committee reference PRI/53 Draft for comment 94/305025 DC ISBN 0 580 25607 3 Committees responsible for this British Standard The pr
3、eparation of this British Standard was entrusted to Technical Committee PRI/53, Carbon black, upon which the following body was represented: British Rubber Manufacturers Association Ltd. Amendments issued since publication Amd. No. Date CommentsBS5293-8:1996 BSI 10-1999 i Contents Page Committees re
4、sponsible Inside front cover National foreword ii Introduction 1 1 Scope 1 2 Normative references 1 3 Principle 1 4 Significance and use 1 5 Apparatus 1 6 Procedure 2 7 Expression of results 2 8 Test report 2 Figure 1 Dust-separation equipment 3 List of references Inside back coverBS5293-8:1996 ii B
5、SI 10-1999 National foreword This Part of BS5293 has been prepared by Technical Committee PRI/53 and is identical with ISO11234:1995 Rubber compounding ingredients Carbon black (pelletized) Determination of dust content, published by the International Organization for Standardization (ISO). The Tech
6、nical Committee has reviewed the provisions of ISO383:1976 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 ISO383:1976 is BS572:1985 Specification for interchangeable conical ground glass
7、 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 Publication ref
8、erred to Corresponding British Standard BS5293 Sampling and testing carbon black for use in the rubber industry ISO 1124:1988 Part 1:1990 Methods of sampling (Identical) ISO 1126:1992 Part 5:1992 Method for determination of loss of mass on heating (Identical) Summary of pages This document comprises
9、 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.BS5293-8:1996 BSI 10-1999
10、1 Introduction The fines content of pelletized carbon blacks, as measured in accordance with ISO1435:1988 Rubber compounding ingredients Carbon black (pelletized) Determination of fines content, encompasses not only the fines but also any micro-pellets having a diameter of less that1254m which may b
11、e present. Consequently, ISO1435 is not specific for the determination of the dust content. Pelletized carbon blacks may contain a considerable proportion of micro-pellets. WARNING Persons using this International Standard should be familiar with nomal laboratory practice. This standard does not pur
12、port 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. 1 Scope This International Standard specifies a method for determin
13、ing 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 all pelletized rubber-grade carbon blacks, more particularly to those pellitized by the dry process which frequently have sm
14、aller pellet sizes than their wet-pelletized counterparts. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are s
15、ubject 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 standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 383:1976,
16、Laboratory glassware Interchangeable conical ground joints. ISO 1124:1988, Rubber compounding ingredients Carbon black shipment sampling procedures. ISO 1126:1992, Rubber compounding ingredients Carbon black Determination of loss on heating. 3 Principle A test portion of carbon black is fluidized on
17、 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 dust content of a carbon black is related to the ability of the product to flow freely and, to a certain extent, its dispersi
18、on 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 dust content can be a relevant parameter in the context of the working-place environment. 5 Apparatus 5.1 Dust-separation equ
19、ipment, as illustrated inFigure 1, and consisting of the elements described in5.1.1 to5.1.4. 5.1.1 Sintered-glass filter, type 0.0 (pore size2504m to5004m). 5.1.2 Glass tube, internal diameter32mm, mounted vertically. 5.1.3 Glass cyclones 5.1.4 Glass collectors, internal diameter18mm. 5.2 Source of
20、dry, oil-free compressed air or nitrogen 5.3 Pressure-regulation valve 5.4 Flowmeter, range5dm 3 /min to25dm 3 /min. 5.5 Analytical balance, sensitivity0,1mg. 5.6 Oven, capable of maintaining a temperature of105 C 2 C or125 C 2 C. 5.7 Usual ancillary laboratory equipment, including a stopwatch. 5.8
21、Elements5.1.1 to5.1.3 are assembled using two ground-glass connections located at the bottom and the top of tube (5.1.2). Elements5.1.3 and5.1.4 (flexibly connected by a rubber seal) are only separated for cleaning purposes. The flexible tubing connecting elements5.4 and5.1.1 must fit the correspond
22、ing outlet and inlet diameters, the other dimensions being immaterial.BS5293-8:1996 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 and5.1.4) to the source of dry compressed gas (5.2) and
23、, using the pressure-regulation valve (5.3), adjust the gas flow to14,4dm 3 /min 0,5dm 3 /min, which corresponds to a gas speed of0,30m/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 specifie
24、d in ISO1126, dry an adequate quantity of the carbon black sample under test for no less than1h at105 C or, better, at125 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 out5g 0,5g of the dried carbon black to th
25、e nearest1mg using the analytical 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 at14,4dm 3 /min, and allow the gas to flow for5mins. 6
26、.7 Stop the gas flow, disconnect 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
27、dust content, expressed as a percentage 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 nearest0,1%; d) any unusual f
28、eatures noted during the determination; e) any operation not included in this International Standard or regarded as optional. +10 0 m 0 is the mass, in grams, of the test portion of dried carbon black; m 1 is the mass, in grams, of the empty glass cyclones and collectors; m 2 is the mass, in grams,
29、of the glass cyclones and collectors with the carbon black dust collected. m 2 m 1 m 0 -100 BS5293-8:1996 BSI 10-1999 3 Key: 5.1.1 Sintered-glass filter 5.1.2 Glass tube 5.1.3 Glass cyclone 5.1.4 Glass collector 5.3 Pressure-regulation valve 5.4 Flowmeter NOTEAll ground-glass joints shall conform to
30、 ISO383. Figure 1 Dust-separation equipment4 blankBS5293-8:1996 BSI 10-1999 List of references See national foreword.BS 5293-8: 1996 ISO 11234: 1995 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards
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