ASTM_D_3265_-_21.pdf

Designation:D326521Standard 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,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 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(epoxidized soybean oil,ESO)to produce 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.The test value is thereforeexpressed in%.3.2 Correction Factor:3.2.1 A correction factor in Eq 3 is needed when rawmaterials Paraplex G-62 and ZnO Lot#8 or earlier producedbefore 2012,in combination with ITRB2,are used.Foradditional details refer to ASTM D3265-17a.3.2.2 There should be no correction applied when ITRB isused with Paraplex G-62 and ZnO Lot#8 or earlier.3.2.3 There should be no correction applied when using thecurrently available tint raw materials(see Section 6)for pastesprepared with either ITRB or ITRB2.4.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 arising1This 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 May 1,2021.Published June 2021.Originallyapproved in 1973.Last previous edition approved in 2019 as D3265 19b.DOI:10.1520/D3265-21.2For 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 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.1between a user and producer should be reso