1、BRITISH STANDARD BS 5293-3: 1996 ISO 1435:1996 Sampling and testing carbon black for use in the rubber industry Part 3: Method for determination of fines content ICS 83.040.20BS 5293-3:1996 This British Standard, having been prepared under the direction of the Sector Board for Materials and Chemical
2、s, was published under the authority of the Standards Board and comes into effect on 15 November 1996 BSI 11-1998 The following BSI references relate to the work on this standard: Committee reference PRI/53 Draft for comment 95/122488 DC ISBN 0 580 26746 6 Committees responsible for this British Sta
3、ndard 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 Ltd. Amendments issued since publication Amd. No. Date CommentsBS 5293-3:1996 BSI 11-1998 i Contents Page
4、Committees responsible Inside front cover National foreword ii 1 Scope 1 2 Normative references 1 3 Principle 1 4 Apparatus 1 5 Procedure 1 6 Expression of results 2 7 Precision and bias 2 8 Test report 2 List of references Inside back coverBS 5293-3:1996 ii BSI 11-1998 National foreword This Part o
5、f BS 5293 has been prepared by Technical Committee PRI/53 and is identical with ISO 1435:1996 Rubber compounding ingredients Carbon black (pelletized) Determination of fines content, published by the International Organization for Standardization. It supersedes BS 5293-3:1990 which is withdrawn. The
6、 Technical Committee has reviewed the provisions of ISO 565:1990, to which normative reference is made in the text, and has decided that they are acceptable for use in conjunction with this standard. ISO 565:1990 is related to BS 410:1986 Specification for test sieves. A British Standard does not pu
7、rport 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 ISO 1124:1998 BS 5293 Sampling and testing carbon blac
8、k for use in the rubber industry, Part 1:1990 Methods of sampling. (Identical) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 and 2, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amen
9、dments incorporated. This will be indicated in the amendment table on theinside front cover.BS 5293-3:1996 BSI 11-1998 1 WARNING Persons using this International Standard should be familiar with normal laboratory practice. This standard does not purport to address all of the safety problems, if any,
10、 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 the determination of the fraction of a test portion of pell
11、etized carbon black that will pass through a sieve with 125m nominal aperture size under specified conditions (i.e. the fines content). It is applicable to all types of pelletized carbon black for use in the rubber industry. 2 Normative references The following standards contain provisions which, th
12、rough reference in this text, constitute 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 ap
13、plying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 565:1990, Test sieves Metal wire cloth, perforated metal plate and electroformed sheet Nominal sizes of openings. ISO 1124:1988, Rubber compound
14、ing ingredients Carbon black shipment sampling procedures. 3 Principle A test portion of pelletized carbon black is weighed accurately and sieved through a 125 m aperture sieve with shaking and tapping. The amount of material passing through the sieve is measured as the fines. 4 Apparatus 4.1 Mechan
15、ical sieve shaker 1) , which imparts a uniform rotary and tapping motion to a stack of200-mm-diameter sieves. The mechanism shall produce 280 to 320 rotary motions per minute(4,6to 5,3 per second) and 140 to 160 taps per minute (2,3 to 2,7 per second) to a cork fitted in the centre of the sieve cove
16、r (4.4) and extending3mm to 9 mm above it. Only cork shall be used, rubber being unsuitable. 4.2 Sieve, approximately 200mm in diameter and25mm in height, to fit the mechanical sieve shaker(4.1). The sieve shall be of nominal aperture size 125m and shall comply with the requirements of ISO565. Only
17、corrosion-resistant woven metal-wire cloth shall be used. 4.3 Bottom receiver pan 4.4 Sieve cover 4.5 Riffle-type sample splitter, with six or more parallel troughs on each side, designed to divide a sample of carbon black into two equal parts. 4.6 Balance, accurate to 1 mg. 5 Procedure 5.1 Obtain t
18、he test portion of carbon black as follows: 5.1.1 Pass a representative sample, taken in accordance with ISO1124, through the sample splitter (4.5) to obtain a test portion of 22 g to 28 g or, for carbon blacks such as thermal blacks, which have a bulk density roughly twice that of most carbon black
19、s (600kg/m 3to 650kg/m 3 ), a test portion of 47 g to 53 g. 5.1.2 Weigh the test portion to the nearest 0,1 g. 5.2 Transfer the weighed test portion to the sieve(4.2). Using other sieves as spacers if necessary, cover the top and place the receiver pan(4.3) underneath. If spacers are used, the sieve
20、 containing the test material shall be placed at the bottom of the stack. NOTE 1The position in the stack of the sieve containing the test material affects the test result: the higher the sieve in the stack, the higher the result. 1) A Ro-Tap sieve shaker is satisfactory for this purpose, available
21、from Tyler Power Systems, 8648 Tyler Boulevard, Mentor,OH44060, USA or Stein Industrie, 19, avenue Morane, Saulnier, F-78140 Vlizy-Villacoublay, France This information is given for the convenience of users of this International Standard and does not constitute an endorsement by ISO of the equipment
22、 named. Other equipment may be used if it can be shown to lead to the same results.BS 5293-3:1996 2 BSI 11-1998 5.3 Allow the sieve assembly to shake, with the hammer operating, for 5 min, or for a different period if agreed between the purchaser and the supplier. 5.4 Remove the sieve and receiver p
23、an from the shaking device, and weigh the carbon black in the receiver pan to the nearest 1 mg. 6 Expression of results The fines content C F , expressed as a percentage by mass, is given by the formula where Express the result to the nearest 0,1 % (m/m). 7 Precision and bias 7.1 The precision data
24、given below only give an estimate of the precision of this method. The precision parameters shall not be used for acceptance/rejection testing of any group of materials without documentation that they are applicable to those particular materials and the specific testing protocols that include this t
25、est method. 7.2 These precision data are based on a single determination carried out on four samples by six laboratories on two days. The samples studied ranged from about 2 % (m/m) to about 11 % (m/m). Both repeatability and reproducibility represent short-term testing. Precision is expressed in re
26、lative terms. In the absence of the necessary detailed results, the precision data relevant to this International Standard cannot be presented in the format recommended by ISO/TR 9272:1986, Rubber and rubber products Determination of precision for test method standards. 7.3 Repeatability (single ope
27、rator) The repeatability r has been estimated to be 50 % of a test result. Two single test results that differ by more than 50 % of their average value shall be considered suspect and dictate that some appropriate investigative action be taken. 7.4 Reproducibility (interlaboratory) The reproducibili
28、ty R has been estimated to be 97 % of a test result. Two single test results that differ by more than 97 % of their average value shall be considered suspect and dictate that some appropriate investigative action be taken. 7.5 Bias In test method terminology, bias is the difference between an averag
29、e test value and the reference or true value of a property. Reference values do not exist for this test method since the value of the test property is exclusively defined by the test method. Bias, therefore, cannot be determined. 7.6 The above precision data may appear quite poor. It must be borne i
30、n mind, however, that they are expressed in percent relative, making the difference between two test results very high when the actual fines content is low. Results shall therefore be interpreted with care. 8 Test report The test report shall include the following information: a) a reference to this
31、 International Standard; b) all details necessary for identification of the sample; c) the duration of shaking of the sieve assembly; d) the result obtained. m 0 is the mass, in grams, of the test portion; m 1 is the mass, in grams, of carbon black in the receiver pan. C F m 1 m 0 -100 =BS 5293-3:19
32、96 BSI 11-1998 List of references See national foreword.BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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