ASTM_D_1765_-_21.pdf

Designation:D176521Standard Classification System forCarbon Blacks Used in Rubber Products1This standard is issued under the fixed designation D1765;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This classification system covers the classification ofrubber-grade carbon blacks by the use of a four-characternomenclature system.The first character gives some indicationof the influence of the carbon black on the rate of cure of atypical rubber compound containing the black.The secondcharacter gives information on the average surface area of thecarbon black.The last two characters are assigned arbitrarily.1.2 All rubber-grade carbon blacks for which a number iscurrently assigned at the time of publication of this classifica-tion system are listed in Table 1 together with some of theirtypical properties.ASTM classification numbers(“N”or“S”designation)not listed in Table 1 have either been withdrawnor are not currently assigned.The use of inactive or unassignedN or S designations is prohibited until such a time as thedesignation is officially reactivated or assigned by Subcommit-tee D24.411.3 The values stated in SI units are to be regarded asstandard.The values given in parentheses are for informationonly.1.4 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.1.5 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:2D1508 Test Method for Carbon Black,Pelleted Fines andAttritionD1510 Test Method for Carbon BlackIodine AdsorptionNumberD1513 Test Method for Carbon Black,PelletedPour Den-sityD1514 Test Method for Carbon BlackSieve ResidueD2414 Test Method for Carbon BlackOil AbsorptionNumber(OAN)D3053 Terminology Relating to Carbon BlackD3265 Test Method for Carbon BlackTint StrengthD3493 Test Method for Carbon BlackOil AbsorptionNumber of Compressed Sample(COAN)D6556 Test Method for Carbon BlackTotal and ExternalSurface Area by Nitrogen AdsorptionD7854 Test Method for Carbon Black-Void Volume at MeanPressure3.Basis of Classification3.1 The first character in the nomenclature system forrubber-grade carbon blacks is a letter indicating the effect ofthe carbon black on the cure rate of a typical rubber compoundcontaining the black.The letter“N”is used to indicate a normalcuring rate typical of furnace blacks that have received nospecial modification to alter their influence on the rate of cureof rubber.The letter“S”is used for channel blacks or forfurnace blacks that have been modified to effectively reducethe curing rate of rubber.Channel blacks characteristicallyimpart a slower rate of cure to rubber compounds.Thus,theletter“S”designates a slow cure rate.Blacks may varyconsiderably in“curing rate”within each of the two letterclassifications.1This classification system is under the jurisdiction ofASTM Committee D24 onCarbon Black and is the direct responsibility of Subcommittee D24.41 on CarbonBlack Nomenclature and Terminology.Current edition approved May 1,2021.Published May 2021.Originallyapproved in 1965.Last previous edition approved in 2019 as D1765 19.DOI:10.1520/D1765-21.2For 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.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.13.2 The second character in the system is a digit to designatethe average surface area of the carbon black as measured bynitrogen surface area.The surface area range of the carbonblacks has been divided into ten arbitrary groups,and each hasbeen assigned a digit to describe that group.These groups areas follows:Group No.Average NitrogenSurface Area,m2/g01501121 to 1502100 to 120370 to 99450 to 69540 to 49633 to 39721 to 32811 to