ASTM_D_8043_-_20.pdf

Designation:D804320Standard Guide forCarbon BlackShelf Life1This standard is issued under the fixed designation D8043;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 guide defines the shelf life of carbon black.1.2 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:D1509 Test Methods for Carbon BlackHeating LossD1510 Test Method for Carbon BlackIodine AdsorptionNumberD4821 Guide for Carbon BlackValidation of Test MethodPrecision and BiasD6915 Practice for Carbon BlackEvaluation of StandardReference Blacks3.Significance and Use3.1 This guide defines the shelf life of carbon black whenstored under proper conditions.4.Carbon Black Shelf Life4.1 In accordance with Practice D6915,the shelf life ofStandard Reference Blacks(SRBs)is defined as indefinitewhen stored in a manner that protects it from liquid water orhigh humidity environments.The only two properties ofcarbon black known to change over time are moisture(TestMethods D1509)and Iodine Number(Test Method D1510).The moisture content can change over the short-term(weeks ormonths),depending on the ambient humidity and the surfacearea of the carbon black,see 4.4.Iodine Number can changeover an extended period(years)due to a slow increase in theoxygen content on the surface of the carbon black.Thisphenomenon is primarily observed with tread grades(N100 N300 series)and other high surface area carbon blacks,andmanifests itself by a slowly decreasing Iodine Number,al-though the actual surface area of the carbon black remainsunchanged.For more details about the aging effect on iodinenumber,see subsection 5.1.1 of Guide D4821.4.2 The same reasoning for the shelf life of SRBs extends tocommercial carbon black.It should be noted that the slightchange in Iodine Number over an extended period does notaffect actual surface area properties and in-rubber performanceof the carbon black.4.3 The in-rubber properties of a wide range of carbon blackgrades have shown no significant change over a 4 year period,see Table 1 and Table 2.4.4 In cases where the carbon black moisture level hasincreased over time,heating the carbon black at 125C for anadequate amount of time will remove the moisture and renderthe material fit for use.4.5 Based on studies by ASTM Committee D24,the shelflife of carbon black is indefinite.5.Keywords5.1 carbon black;shelf life1This guide is under the jurisdiction ofASTM Committee D24 on Carbon Blackand is the direct responsibility of Subcommittee D24.67 on Sustainability.Current edition approved June 1,2020.Published June 2020.Originallyapproved in 2016.Last previous edition approved in 2016 as D8043 16.DOI:10.1520/D8043-20.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.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard.Users of this standard are expressly advised that determination of the validity of any such patent rights,and the riskof infringement of such rights,are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised,either reapproved or withdrawn.Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters.Your comments will receive careful consideration at a meeting of theresponsible technical committee,which you may attend.If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards,at the address shown below.This standard is copyrighted by ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.Individual reprints(single or multiple copies)of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585(phone),610-832-9555(fax),or serviceastm.org(e-mail);or through the ASTM website(www.astm.org).Permission rights to photocopy the standard may also be secured from the Copyright Clearance