1、Designation:D161899(Reapproved 2011)Standard 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 o
2、f 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 i
3、n 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 purpo
4、rt 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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D1799 Pr
5、actice 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 carbon black toluene discoloration,n the t
6、ransmit-tance,at 425 nm,of the filtrate obtained from the tolueneextract of carbon black,compared to that of pure toluene.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 Spectr
7、ophotometer,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.
8、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 Fi
9、lter 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 f
10、an and motor.5.13 Toluene,analytical reagent grade.6.Sampling6.1 Samples shall be taken in accordance with PracticeD1799 or Practice D1900.7.Standardization of Apparatus7.1 Turn on the spectrophotometer and allow it to warm forthe length of time specified by the manufacturer.1This test method is und
11、er 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 May 1,2011.Published July 2011.Originally approvedin 1965.Last previous edition approved in 2004 as D1618 99(2004).D
12、OI:10.1520/D1618-99R11.2For 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 Harbo
13、r Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 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
14、 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 a
15、pproved 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 surfaces with thelint-free wiping paper while holding the cuvet in front of asuitable light source.The toluene must be fr
16、ee of any contami-nants,such as lint particles,which might cause light scattering,thus influencing the test results.If necessary,rewipe the outsideuntil perfectly clean,or clean the inside surfaces with a cottonswab.Repeat 7.5 if the inside surfaces are cleaned.7.7.Insert the cuvet into the spectrophotometer and adjustit to read 100%transmittance at the 425-nm wavelength.8.Procedure8.1 Dry an adequate sample of carbon black at 125 6 1Cfor 60,+5,0 min,using a gravity-convection oven.NOTE2An infra
