ASTM_D_3265_-_15a.pdf

Designation:D326515aStandard Test Method forCarbon BlackTint Strength1This standard is issued under the fixed designation D3265;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 determination of the tintstrength of carbon black relative to an industry tint referenceblack(ITRB).1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.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 and health practices and determine the applica-bility of regulatory limitations prior to use.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 ManufacturingIndustriesD4821 Guide for Carbon BlackValidation of Test MethodPrecision and Bias3.Summary of Test Method3.1 A carbon black sample is mixed with a white powder(zinc oxide)and a liquid vehicle(soybean oil epoxide)toproduce a black or gray paste.This paste is then spread toproduce a surface suitable for measuring the reflectance of themixture by means of a photo-electric reflectance meter.Thereflectance of the tested sample is then compared to thereflectance of the ITRB prepared in the same manner.The tintstrength of the tested sample is expressed as units of thereflectance of the ITRB divided by the reflectance of thesample and multiplied by 100,when calibration and standard-ization in Section 8 is performed with the original ITRB ormultiplied by 101.34 when ITRB2 is used in the calibrationand standardization step.4.Significance and Use4.1 For the broad range of commercial rubber grade carbonblacks,tint strength is highly dependent upon particle size.Tintstrength can be used as an indication of particle size;however,tint strength is also dependent on structure and aggregate sizedistribution.Therefore,differences in tint strength withingrades of carbon black may reflect differences other thanparticle size.NOTE1This test method was developed primarily for the character-ization of N100,N200,and N300 series carbon blacks.4.2 Tint strength values within the carbon black industryhave been developed using a Automatic Muller apparatuswhich is used to prepare carbon black-zinc oxide pastes.Anewmixing apparatus,SpeedMixer3(DAC 150 FVZ),and a corre-sponding procedure have been extensively studied within D24and shown to provide equivalent tint strength for all carcass orsoft blacks and most tread blacks with the exception of highersurface area N100 types and specialty blacks.Therefore,it isthe responsibility of the user of this alternate apparatus toensure their products will adequately disperse.Disputes arisingbetween a user and producer should be resolved using theAutomatic Muller apparatus until ASTM develops adequateprecision statements.4.3 The term ITRB is used in the entire text for both,theoriginal ITRB,used as the first reference material for tinttesting,but which is now used up,and the successor referencematerial,ITRB2.Wherever required,like in calculations whereit is crucial to differentiate between the original ITRB andITRB2,this will be clearly mentioned in the text of the testprocedure.1This test method is under the jurisdiction of ASTM Committee D24 on CarbonBlack and is the direct responsibility of Subcommittee D24.21 on Carbon BlackSurface Area and Related Properties.Current edition approved Nov.1,2015.Published December 2015.Originallyapproved in 1973.Last previous edition approved in 2015 as D3265 15.DOI:10.1520/D3265-15A.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.3SpeedMixer is a registered trademark of FlackTek Inc.,1708 Highway 11,Bldg.G,Landrum,SC 29356.http:/Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.Apparatus5.1 Analytical Balance,with a sensitivity of 60.1 mg.5.2 Automatic Muller.4,55.3 Photometric Instrument,capable of detecting differ-ences in the amount of light reflectance between shades ofgray.6,5The instrument is to be operated following the manu-facturers instructions for optimum performance.5.4 Oven,Gravity-Convection Type,capable of temperatureregulation within 61C at 125C(62F at 257F)andtemperature uniformity within 65C(69F).5.5 Reflectance Standards,as required for each reflectanceinstrument for checking calibration.5.6 Spat