ASTM_D_3324_-_01a.pdf

Designation:D 3324 01aStandard Practice forCarbon BlackImproving Test Reproducibility Using ASTMStandard Reference Blacks1This standard is issued under the fixed designation D 3324;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(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice provides a statistical procedure for im-proving test reproducibility when a laboratory cannot physi-cally calibrate its apparatus to obtain the standard values of theASTM reference blacks,within the ranges given in theprecision statement of the test method concerned.1.2 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:D 1510 Test Method for Carbon BlackIodine AdsorptionNumber2D 2414 Test Method for Carbon BlackOil AbsorptionNumber2D 3037 Test Methods for Carbon BlackSurface Area byNitrogen Adsorption3D 3265 Test Method for Carbon BlackTint Strength2D 3493 Test Method for Carbon BlackOil AbsorptionNumber of Compressed Sample2D 3765 Test Method for Carbon BlackCTAB(Cetyltrim-ethylammonium Bromide)Surface Area2D 4483 Practice for Determining Precision for Test MethodStandards in the Rubber and Carbon Black Industries2D 4820 Test Methods for Carbon BlackSurface Area byMultipoint B.E.T.Nitrogen Adsorption4D 4821 Guide for Carbon BlackValidation of TestMethod Precision and Bias2D 5816 Test Methods for Carbon BlackExternal SurfaceArea by Multipoint Nitrogen Adsorption43.Terminology3.1 Definitions:3.1.1 ASTM reference blacks,na set of six blacks thatspan the useful range of the test method for which they arestandards.3.1.2 measured value,nan observed test result as opposedto a standard value.3.1.3 regression of standard values on measured values,nstatistical equation derived by the method of least-squares.3.1.4 standard value,nthe value assigned to a referenceblack byASTM Committee D24 on Carbon Black.Usually thisvalue is calculated as the average test result of an interlabora-tory testing program.4.Procedure4.1 Physically calibrate the test apparatus using the instruc-tions in the test method or the manufacturers instructions.4.2 Test the ASTM Standard Reference Blacks(SRB)asufficient number of times to establish firm measured values.Itis recommended that the measured values be control charted inaccordance with Guide D 4281.4.3 Calculate the regression of the standard values on themeasured values.This relationship has usually been observedto be linear,although a curvilinear function might conceivablysometimes exist.4.4 Correct the values measured on all subsequent samplesby substituting each measured value into this equation andcalculating the corrected value.Because it has been shown thatthe iodine adsorption number of carbon black decreases invalue as the black ages,it is inappropriate to apply a statisticalcorrection factor to the iodine adsorption number,Test MethodD 1510.4.5 Alternatively,a nomograph or a table of numbers maybe used to find the correspondence between a measured valueand a calibrated value.4.6 Recheck this regression equation whenever replacementapparatus or a new lot of materials is put into use.Also,recheck it periodically to find changes due to wear or aging.4.7 Each laboratory is responsible for establishing andmaintaining the correlation between the ASTM referenceblacks and their measured values.1This 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 Dec.10,2001.Published February 2002.Originallypublished as D 3324 74.Last previous edition D 3324 01.2Annual Book of ASTM Standards,Vol 09.01.3Discontinued 1999;see 1998 Annual Book of ASTM Standards,Vol 09.01.4Discontinued 2000;replaced by Test Method D 6556;see 1999 Annual Book ofASTM Standards,Vol 09.01.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.NOTICE:This standard has either been superseded and replaced by a new version or discontinued.Contact ASTM International(www.astm.org)for the latest information.5.ASTM D24 Standard Reference Blacks55.1 The target values and control chart limits for the SRB 6seriesweredeterminedinaccordancewithPracticeD 448399.5.1.1 Target and control chart limits data on the SRB 6series,as determined during the validation of the SRB 6 seriesin 2001,is given in Table 1.5.1.2 SRB 4 is now depleted but may still be in use in somelaboratories.65.1.3 SRB 5 is now depleted but may still be in use in somelaboratories.66.Keywords6.1 ASTM reference black