1、Designation:D691512Standard Practice forCarbon BlackEvaluation of Standard Reference Blacks1This standard is issued under the fixed designation D6915;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number
2、in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers guidelines for the production andtesting for uniformity of a set of carbon blacks to be used asStandard Reference Blacks(SRBs
3、).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
4、-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D1510 Test Method for Carbon BlackIodine AdsorptionNumberD2414 Test Method for Carbon BlackOil AbsorptionNumber(OAN)D3265 Test Method for Carbon Black
5、Tint StrengthD3493 Test Method for Carbon BlackOil AbsorptionNumber of Compressed Sample(COAN)D4483 Practice for Evaluating Precision for Test MethodStandards in the Rubber and Carbon Black ManufacturingIndustriesD4821 Guide for Carbon BlackValidation of Test MethodPrecision and BiasD6556 Test Metho
6、d for Carbon BlackTotal and ExternalSurface Area by Nitrogen Adsorption3.Significance and Use3.1 This practice is intended to ensure that SRBs areproduced and evaluated by a standard procedure.3.2 This practice is to be used to establish the averagephysicochemical properties of a set of carbon black
7、s to be usedas SRBs.3.3 The carbon black grades to be used as SRBs should beselected to give as much coverage of the typical usage rangefor each test and as nearly evenly spaced across the range aspossible.Typically,the carbon black grades selected consist ofthree tread(hard)type furnace grades(desi
8、gnatedA,B,and C),three carcass(soft)type furnace grades(designated D,E,andF),and one thermal type grade(designated G).SubcommitteeD24.61 may elect to carry one or more of the existing SRBsinto the next set provided there is enough remaining material atthe rate of usage to last through the expected l
9、ife of the nextset.Limiting the choice of grades to be used means that not alltests will have an SRB set that is evenly spaced across therange of interest.All the SRB candidates are produced atapproximately the same time by the various producers.Theyare used as a set once they are approved.The sets
10、areconsecutively numbered.Values and identification for thecurrent set are given in Guide D4821.Any SRBs carriedforward will be renumbered for the new set.4.Production,Packaging,Quality Control,and QualityAssurance4.1 It is assumed that manufacturers of the SRBs will usestate-of-the-art techniques t
11、o ensure maximum uniformitythroughout the entire production run.The production should bemade in one continuous production and packaging lot run.Thetesting called for in this practice is not intended to be asubstitute for in-process quality control.This interlaboratorystudy is only adequate to verify
12、 the quality of a homogeneouslot.4.2 The size of the lot for each SRB is determined byhistorical records on the rate of use.The lot should have anexpected life of about five years at the most recent rate of use.Historically,the lot size has usually been 10 000 lb.4.2.1 The actual usage rate of any r
13、eference material mayresult in one or more SRB material being depleted before theremaining materials in a given SRB set.When this happens,Subcommittee D24.61 may elect to have a supplemental lotproduced for the needed SRB(s).4.2.2 It is preferred that any supplemental SRB lots beproduced at the same
14、 location,on the same production1This practice is under the jurisdiction of ASTM Committee D24 on CarbonBlack and is the direct responsibility of Subcommittee D24.61 on Carbon BlackSampling and Statistical Analysis.Current edition approved June 1,2012.Published August 2012.Originallyapproved in 2003
15、.Last previous edition approved in 2007 as D6915 07.DOI:10.1520/D6915-12.2For 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 w
16、ebsite.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 equipment,under the same production conditions as reason-ably possible,and using the same production targets andspecifications as was used to produce the initial SRB lot inorder to minimize variation between the two lots.4.2.3 The supplemental lot size must be large enough tomeet the expected life of the remaining materials in the SRBset and without a prohibitively large quantity
