ASTM_D_3958_-_06_2016.pdf

Designation:D395806(Reapproved 2016)Standard Test Methods forRubberEvaluation of BIIR and CIIR(HalogenatedIsobuteneIsoprene Rubber)1This standard is issued under the fixed designation D3958;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 of halogenated isobutene-isoprene rubbers(BIIR andCIIR).1.2 Both mill and miniature internal mixer procedures aregiven.1.3 The values stated in SI units are to be regarded asstandard.The values given in parentheses are for informationonly.1.4 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 consult andestablish appropriate safety and health practices and deter-mine the applicability of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D412 Test Methods for Vulcanized Rubber and Thermoplas-tic ElastomersTensionD1646 TestMethodsforRubberViscosity,StressRelaxation,andPre-VulcanizationCharacteristics(Mooney Viscometer)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 tests are intended mainly for referee purpose butmay be used for quality control of rubber production.Theymay also be used in research and development work and forcomparison of different samples in a standard formula.3.2 These tests may be used to obtain values for qualitycontrol acceptance of rubber.4.Standard Test Formulas4.1 Standard FormulasSee Table 1.5.Sample Preparation5.1 Obtain and prepare the test samples in accordance withPractice D3896.6.Mixing Procedures6.1 For general mixing procedures,refer to Practice D3182.6.1.1 The compound may be prepared either on a mill,in aminiature internal mixer,or a lab internal mixer,althoughslightly different results may be obtained.6.2 Mixing Cycles:6.2.1 Method A:Mill MixSee Table 2.6.2.1.1 Mix with the mill roll temperature maintained at 406 5C(104 6 9F).The indicated mill openings should bemaintained insofar as possible to provide a standard foruniform breakdown of the rubber due to milling.Necessaryadjustments may be made to maintain a good working bank atthe nip of the rolls.6.2.1.2 Condition the carbon black in accordance with 5.6of Practice D3182.This is critical with halogenated IIR whenthe simple zinc oxide cure is used.6.2.1.3 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.1These 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 June 1,2016.Published July 2016.Originally approvedin 1980.Last previous edition approved in 2011 as D3958 06(2011).DOI:10.1520/D3958-06R16.2For 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 6.2.1.4 If required,cut samples from the batch to allowtesting of compound viscosity and processability in accordancewith Test Methods D1646 or D6204,and vulcanization char-acteristics in accordance with Test Methods D2084 or D5289.6.2.1.5 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 D3182.6.2.2 Method B:Miniature Internal Mixer(MIM)MixSeeTable 3.6.2.2.1 Mix with the head temperature of the miniatureinternal mixer maintained at 60 6 3C(140 6 5F)and theempty chamber rotor rotational frequency at 1 to 1.05 r/s(60 to63 rpm).6.2.2.2 Condition the carbon black in accordance with 5.6of Practice D3182.This is critical with halogenated butylrubber when the simple zinc oxide cure is used.6.2.2.3 After mixing according to Table 3,turn off themotor,raise the ram,remove the head,and discharge the batch.Record the batch temperature.6.2.2.4 Immediately pass the discharge from the mixertwice through a stan