ASTM_D_3188_-_06_2010.pdf

Designation:D318806(Reapproved 2010)Standard Test Methods forRubberEvaluation of IIR(Isobutene-Isoprene Rubber)1This standard is issued under the fixed designation D3188;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 These test methods cover the standard materials,testformula,mixing procedures,and test methods for the evalua-tion and production control of non-halogenated isobutene-isoprene rubbers(IIR),commonly known as butyl rubber.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-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D412 Test Methods for Vulcanized Rubber and Thermoplas-tic ElastomersTensionD1646 Test Methods for RubberViscosity,Stress Relax-ation,and Pre-Vulcanization Characteristics(Mooney Vis-cometer)D2084 Test Method for Rubber PropertyVulcanizationUsing Oscillating Disk Cure MeterD3182 Practice for RubberMaterials,Equipment,and Pro-cedures for Mixing Standard Compounds and PreparingStandard Vulcanized SheetsD3896 Practice for Rubber From Synthetic SourcesSamplingD4483 Practice for Evaluating Precision for Test MethodStandards in the Rubber and Carbon Black ManufacturingIndustriesD5289 Test Method for Rubber PropertyVulcanizationUsing Rotorless Cure MetersD6204 Test Method for RubberMeasurement of Unvulca-nized Rheological Properties Using Rotorless Shear Rhe-ometers3.Significance and Use3.1 These test methods are mainly intended for refereepurpose but may be used for quality control of rubber produc-tion.They may also be used in research and development workand for comparison of different rubber samples in a standardformula.3.2 These test methods may be used to obtain values foracceptance of rubber.4.Standard Test Formula4.1 Standard FormulaSee Table 1.5.Sample Preparation5.1 For tests intended for referee purposes obtain andprepare the samples in accordance with Practice D3896.6.Mixing Procedures6.1 The compound may be prepared either on a mill,in aminiature internal mixer,or a lab internal mixer,althoughslightly different results may be obtained.6.1.1 Method AMill mix(6.2)6.1.2 Method BMiniature Internal Mixer(MIM)Mix(6.3)6.1.3 Method CLab Banbury(6.4)NOTE1It is not implied that comparable results will be obtained bythese test methods.6.2 Method AMill Procedure:6.2.1 For general mixing procedures,refer to PracticeD3182.Mix with the mill roll temperature maintained at 50 65C(122 6 9F).The indicated mill openings should bemaintained as nearly as possible to provide a standard degreeof breakdown for the rubber due to milling.Necessary adjust-ments may be made to maintain a good working bank at the nipof the rolls.6.2.2 Mixing CycleSee Table 2.6.2.2.1 After mixing according to Table 2,measure andrecord the batch mass.If it differs from the theoretical value bymore than 0.5%,discard the batch.6.2.2.2 If required,cut samples from the batch to allowtesting of compound viscosity and processability in accordance1These test methods are under the jurisdiction of ASTM Committee D11 onRubber and are the direct responsibility of Subcommittee D11.23 on SyntheticRubbers.Current edition approved Dec.1,2010.Published February 2011.Originallyapproved in 1973.Last previous edition approved in 2006 as D3188 06.DOI:10.1520/D3188-06R10.2For 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 Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 with Test Methods D1646 or D6204,and vulcanization char-acteristics in accordance with Test Methods D2084 or D5289.6.2.2.3 If tensile stress strain tests are required,sheet off toa finished thickness of approximately 2.2 mm(0.087 in.)andcondition the compound according to Practice D3182.6.3 Method BMiniature Internal Mixer Mix:6.3.1 For general mixing procedure,refer to PracticeD3182.Mix with the head temperature of the miniatureinternal mixer maintained at 60 6 3C(140 6 5F)and theunloaded rotor speed at 6.3 to 6.6 rad/s(60 to 63 rpm).6.3.2 Prepare the rubber by passing it through a mill onetime with the temperature set at 50 6 5C(122 6 9F)and anopening of 0.5 mm(0.02 in.)thick.Cut the sheet into strips thatare approximately 25 mm(1 in.)wide,if desired.6.3.3 Mixing CycleSee Table 3.6.3.3.1 After mixing according to Table 3,turn off themotor,raise