1、BRITISH STANDARD BS ISO 21870:2005 Rubber compounding ingredients Carbon black Determination of high-temperature loss on heating by thermogravimetry ICS 83.040.20 BS ISO 21870:2005 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 1 February 20
2、05 BSI 1 February 2005 ISBN 0 580 45395 2 National foreword This British Standard reproduces verbatim ISO 21870:2005 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee PRI/50, Rubber raw, natural and synthetic, including latex
3、and carbon black, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under
4、 the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct appli
5、cation. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; mo
6、nitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii and iii, a blank page, pages 1 to 4, an inside back cover and a back cover. The BSI copyright notice displa
7、yed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments Reference number ISO 21870:2005(E) OSI 5002INTERNATIONAL STANDARD ISO 21870 First edition 2005-01-15 Rubber compounding ingredients Carbon black Determination of high-temperat
8、ure loss on heating by thermogravimetry Ingrdients de mlange du caoutchouc Noir de carbone Dtermination de la perte la chaleur haute temprature par thermogravimtrie BSISO21870:2005IS:07812 O5002(E) DPlcsid Fremia ihTs PDF file may ctnoian emdebt dedyfepcaes. In ccaocnadrw eith Aebods licensilop gnic
9、,y this file mairp eb ynted iv roweb detu slahl ton ide ebtlnu deess the typefaces whice era hml era deddebicsnede to i dnanstlaled t noeh computfrep reormign tide ehtin.g In wodlnidaot gnhis file, trapise atpecc tiereht nser ehnopsiiblity fo not infriigngn Aebods licensilop gnic.y ehT ISO tneClar S
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11、 sneeru that the file is suitlbae fosu re yb ISO memdob rebeis. In tlnu ehikletneve y ttah lborp aem leratit gno it is f,dnuo plsaee inform ttneC ehlar Secrteiraat ta the serddaig sleb nevwo. ISO 5002 All irthgs erse.devr lnUeto sswrehise specified, on trap fo this lbupictaion maeb y cudorperro de t
12、uilizi den yna form ro na ybm ynae,s lecetrinoc ro mecinahcal, inclidung tohpcoiypodna gn micrfoilm, wittuoh repmissii non writign from ietI rehSa Ot tsserdda eh ebolw or ISOs memreb i ydobn the cnuotrfo y ttseuqer ehe.r ISO cirypothg fofice saCe tsopale 65 eneG 1121-HC 02 av leT. 4 + 10 947 22 1 11
13、 xaF0 947 22 14 + 9 74 E-mail coirypthgiso.o gr We bwww.is.o gro Pulbisdehi n Switlrez dnaii ISO 5002 Allr ithgsr esedevrBSISO21870:2005IS:07812 O5002(E) I SO 5002 All irthgs ersedevr iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards
14、 bodies (ISO member 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 organiza
15、tions, governmental 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 t
16、he ISO/IEC Directives, 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
17、 the member bodies 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 21870 was prepared by Technical Committee ISO/TC 45, Rubber an
18、d rubber products, Subcommittee SC 3, Raw materials (including latex) for use in the rubber industry. BSISO21870:2005blank 5002:07812OSISBINTENRATIONAL TSANDADR IS:07812 O5002(E)I SO 5002 All irthgs ersedevr 1Rubber compounding ingredients Carbon black Determination of high-temperature loss on heati
19、ng by thermogravimetry 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, associated with its use. It is the responsibility of the user to establish appropriate safety and
20、 health practices and to ensure compliance with any national regulatory conditions. 1 Scope This International Standard describes a method for quantitative determination of the loss on heating (pyrolysis) of carbon black due to the elimination of volatile materials other than those liberated when he
21、ating to 125 C (ISO 1126). The method is applicable to carbon black for the rubber industry. It serves to assess the decomposition of functional groups and adsorbed substances (e.g. hydrocarbons) present on the surface of the carbon black. 2 Principle A known mass of carbon black is placed in the cr
22、adle of a thermobalance and heated according to a predetermined temperature programme in a controlled, oxygen-free atmosphere. The mass variation recorded provides a thermogram which can be used for quantitative evaluation. 3 Apparatus There are several thermogravimetric measurement instruments avai
23、lable commercially. The basic components are: 3.1 Thermobalance, with a sensitivity of one microgram and equipped with an appropriate cradle made of a non-oxidizing material. 3.2 Furnace, allowing temperature regulation from the ambient temperature up to approximately 1 000 C. 3.3 Temperature progra
24、mmer, allowing a heating rate of up to 50 C/min. 3.4 Nitrogen gas distributor, associated with flow-control equipment allowing measurements in a range from 10 cm 3 /min to 250 cm 3 /min. 3.5 Data acquisition and processing system. 4 Materials 4.1 Cylinder of compressed nitrogen containing less than
25、10 ppm of oxygen. BSISO21870:2005IS:07812 O5002(E) 2 I SO 5002 All irthgs ersedevr5 Procedure 5.1 Power up the various elements of the analyser and preheat the furnace to 40 C in accordance with the manufacturers instructions. 5.2 Close the furnace of the thermobalance, purge with a constant, predef
26、ined flow of nitrogen (usually 100 cm 3 /min) in accordance with the manufacturers instructions and maintain a constant flow for the duration of the test. 5.3 Wait for the thermobalance to stabilize. 5.4 Place the test sample in the cradle and weigh it to the nearest 0,01 mg. The sample mass should
27、not be less than 5 mg. 5.5 Start the test. 5.6 Heat the furnace to 125 C at a rate of 20 C/min. 5.7 Maintain the temperature at 125 C for 15 min and record the mass. 5.8 Heat the furnace from 125 C to 950 C at a rate of 20 C/min. Due to instrumental limitations, the user may be obliged to run the te
28、st at a lower maximum temperature, e.g. at 800 C. These conditions can lead to slightly lower test results for the loss on pyrolysis and shall therefore be mentioned in the test report. 5.9 Maintain the furnace at a temperature of 950 C until the mass remains constant. A mass loss lower than 0,05 %,
29、 relative to the initial mass, during 15 min is considered as “constant mass”. 6 Expression of results Express the results as percentages of the initial mass: 40 125 40 100 mm V m = 125 950 40 100 mm P m = where V is the volatile matter at 125 C (%) in nitrogen; P is the loss on pyrolysis at 950 C (
30、%) in nitrogen; m 40is the initial mass at 40 C (g); m 125is the mass at 125 C (g); m 950is the mass at 950 C (g). BSISO21870:2005IS:07812 O5002(E) I SO 5002 All irthgs ersedevr 37 Test report The test report shall contain the following information: a) all information necessary for identification of
31、 the sample tested; b) a reference to this International Standard (ISO 21870:2005); c) the type of apparatus used; d) the loss on heating to 125 C (volatile matter), to the nearest 0,1 %; e) the loss on further pyrolysis (125 C to 950 C), to the nearest 0,1 %; f) any deviations from the procedure sp
32、ecified, e.g. a maximum temperature lower than 950 C; g) any unusual features (anomalies) observed during the test; h) the date of the test. BSISO21870:2005IS:07812 O5002(E) 4 I SO 5002 All irthgs ersedevrBibliography 1 ISO 1126, Rubber compounding ingredients Carbon black Determination of loss on h
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