1、Designation: D5605 94 (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
2、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 practice covers a means for producers and users ofemulsion styrene-butadiene rubber (SBR
3、) to establish 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 vi
4、scosity specification 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 t
5、he rubberindustry as 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 practic
6、e addresses the raw Mooney 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 viscosit
7、y levels. The use of this practice enablesproducers of SBR to offer each rubber with a number ofstandard target Mooney viscosity values and informs userswhich Mooney viscosity rubbers are available.NOTE 1Use of this practice will eliminate the need for producers tomanufacture rubbers of the same com
8、position with target Mooney 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
9、.NOTE 2Using this practice will 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.Interchangeabil
10、ity of rubbers from different producers should be simpli-fied.4. Establishing Target Values4.1 Target values for raw Mooney viscosity of SBR shall bechosen from values ending ina0ora5,forexample 55, 60, 65.4.2 Target values may be expressed in any of the customaryunits (specimen preparation, rotor s
11、ize, warm-up time, runningtime 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
12、SBR.4.3.1 Illustration:Producers Mooney viscositytarget value70 UML1 + 4(100C)Users specification range 6282 UML1 + 4(100C)Users specification midpoint 72 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
13、.5. Keywords5.1 Mooney viscosity; SBR; target values1This practice is under the jurisdiction of ASTM 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 pre
14、vious edition approved in 2007 as D5605 94 (2007).DOI: 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
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16、e 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
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18、u 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
19、 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 ASTM website (www.astm.org/COPYRIGHT/).D5605 94 (2011)2
