ASTM_D_1618_-_18.pdf

Designation:D161818Standard Test Method forCarbon Black ExtractablesTransmittance of TolueneExtract1This standard is issued under the fixed designation D1618;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the measurement of the degreeof toluene discoloration by carbon black extractables and isuseful in controlling the reaction processes for production ofcarbon black.This test method may not be applicable to carbonblacks with high extractables.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D1799 Practice for Carbon BlackSampling PackagedShipmentsD1900 Practice for Carbon BlackSampling Bulk Ship-mentsD4483 Practice for Evaluating Precision for Test MethodStandards in the Rubber and Carbon Black ManufacturingIndustries3.Terminology3.1 Definitions:3.1.1 carbonblacktoluenediscoloration,nthetransmittance,at 425 nm,of the filtrate obtained from thetoluene extract of carbon black,compared to that of puretoluene.4.Significance and Use4.1 The toluene discoloration value provides an estimate oftoluene-soluble discoloring residues present on the carbonblack.5.Apparatus and Reagent5.1 Spectrophotometer,with tungsten filament lamp,20-nmmaximum spectral bandpass,capable of measuring percenttransmittance at a 425-nm wavelength.The instrument is to beoperated in accordance with the manufacturers directions foroptimum performance.5.2 Cuvets,rectangular,with an optical light path of 10 mm.5.3 Balance,analytical,with a sensitivity of 60.01 g.5.4 Oven,gravity-convection type,capable temperatureregulation within 61C at 125C and temperature uniformitywithin 65C.5.5 Pipet,automatic,bottle-type,20 cm3,with a repeatabil-ity of 60.1.5.6 Erlenmeyer Flasks,125 cm3with ground-glass stopper.5.7 Filter Paper,qualitative grade,medium retention,medium-fast filter speed,150-mm diameter.5.8 Glass Filtering Funnels,75-mm inside diameter at thetop.5.9 Beakers,50 or 100 cm3,with pouring lips.5.10 Wiping Paper,lint-free.5.11 Cotton Swabs.5.12 Fume Hood,fully enclosed on three sides,with spark-proof fan and motor.5.13 Toluene,analytical reagent grade.6.Sampling6.1 Samples shall be taken in accordance with PracticeD1799 or Practice D1900.1This test method is under the jurisdiction of ASTM Committee D24 on CarbonBlack and is the direct responsibility of Subcommittee D24.31 on Non-CarbonBlack Components of Carbon Black.Current edition approved June 1,2018.Published July 2018.Originally approvedin 1965.Last previous edition approved in 2017 as D1618 17.DOI:10.1520/D1618-18.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 7.Standardization of Apparatus7.1 Turn on the spectrophotometer and allow it to warm forthe length of time specified by the manufacturer.7.2 Check the zero reading of the spectrophotometer inaccordance with the manufacturers instructions,and adjust ifnecessary.7.3 Place the funnel with the filter paper into an Erlenmeyerflask.Filter approximately 30 cm3of toluene into the flask andstopper the flask.7.4 Pour a portion of the toluene into the beaker with thepouring lip for simplifying the transfer of the toluene to thecuvet.7.5 Rinse the cuvet with the filtered toluene three times,filling approximately one third full each time.Discard thisrinsing toluene into an approved safety container.NOTE1The cuvet must be handled on the ground-glass sides only.Donot touch the smooth,clear sides with the fingers.7.6 Fill the cuvet and wipe the outside surfa