1、Designation:D560594(Reapproved 2011)Standard Practice forStyrene-Butadiene Rubber(SBR)Establishing RawMooney Viscosity Target Values1This standard is issued under the fixed designation D5605;the number immediately following the designation indicates the year oforiginal adoption or,in the case of rev
2、ision,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 practice covers a means for producers and users ofemulsion styrene-butadiene rubber(SBR)to establish
3、 commontarget values for the Mooney viscosity of these rubbers.1.2 Mooney viscosity is a widely used measurement forrubber as defined in Test Methods D1646 where the procedurefor its measurement is specified.1.3 The Mooney viscosity target value is defined as themidpoint of a Mooney viscosity specif
4、ication range establishedby a producer or user of rubber.2.Referenced Documents2.1 ASTM Standards:2D1646 Test Methods for RubberViscosity,Stress Relax-ation,and Pre-Vulcanization Characteristics(Mooney Vis-cometer)3.Significance and Use3.1 Mooney viscosity is used extensively in the rubberindustry a
5、s a measurement of the general quality of raw orcompounded uncured rubber.This special viscosity has beenrelated to average molecular weight and to handling andprocessing characteristics in various rubber operations such asmixing,extruding,molding,and so forth.3.2 This practice addresses the raw Moo
6、ney viscosity ofSBR in its finished state at the SBR manufacturers plant andin the ready-to-use state at the rubber product manufacturersplant.3.3 Different processes and different processing equipmentoften require rubber of the same composition at different rawMooney viscosity levels.The use of thi
7、s practice enablesproducers of SBR to offer each rubber with a number ofstandard target Mooney viscosity values and informs userswhich Mooney viscosity rubbers are available.NOTE1Use of this practice will eliminate the need for producers tomanufacture rubbers of the same composition with target Moon
8、ey valuesunrealistically close together.This will allow the manufacturers to produceto each target,and eliminate the need to sort product for many differentspecification ranges.The result will be improved process performanceindexes and more consistent rubber for all users.NOTE2Using this practice wi
9、ll benefit users by providing a publishedlist of the producers Mooney viscosity target values and improvedconsistency of the rubber they receive.The better consistency will resultfrom producing rubber to a target rather than sorting it after it is tested.Interchangeability of rubbers from different
10、producers should be simpli-fied.4.Establishing Target Values4.1 Target values for raw Mooney viscosity of SBR shall bechosen from values ending in a 0 or a 5,for example 55,60,65.4.2 Target values may be expressed in any of the customaryunits(specimen preparation,rotor size,warm-up time,runningtime
11、and temperature).4.3 With targets established at intervals of 5 units,themaximum difference which could occur between a target valueand the midpoint of an established specification range is 2units.A change this small should be able to be accommodatedby most users of SBR.4.3.1 Illustration:Producers
12、Mooney viscositytarget value70 UML1+4(100C)Users specification range6282 UML1+4(100C)Users specification midpoint72 UML1+4(100C)User would choose a Mooney viscosity target value of 70.Ifthe users midpoint had been 73,he would have chosen a targetvalue of 75.5.Keywords5.1 Mooney viscosity;SBR;target
13、values1This practice is under the jurisdiction ofASTM Committee D11 on Rubber andis the direct responsibility of Subcommittee D11.23 on Synthetic Rubbers.Current edition approved Nov.1,2011.Published January 2012.Originallyapproved in 1994.Last previous edition approved in 2007 as D5605 94(2007).DOI
14、:10.1520/D5605-94R11.2For 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
15、Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 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 suc
16、h 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
