ASTM_D_3403_-_07_2016.pdf

Designation:D340307(Reapproved 2016)Standard Test Methods forRubberEvaluation of IR(Isoprene Rubber)1This standard is issued under the fixed designation D3403;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 isoprene rubber(IR).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 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-ometersE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Significance and Use3.1 These tests are mainly intended for referee purposes butmay be used for quality control of rubber production.Theymay also be used in research and development work and forcomparison of different rubber samples in a standard formula.3.2 These tests may also be used to obtain values forcustomer acceptance of rubber.4.Standard Test Formula4.1 Standard FormulaSee Table 1.5.Sample Preparation5.1 Obtain and prepare the test samples in accordance withPractice D3896.6.Mixing Procedures6.1 The compound may be prepared in an internal mixer,ona mill,or in a miniature internal mixer.It is not implied thatcomparable results will be obtained.The following mixingprocedures are provided:6.1.1 Method AInternal Mixer for Initial and FinalMix(6.2),6.1.2 Method BInitial Internal Mix with Final MillMix(6.3),6.1.3 Method CMill Mix,(6.4),and6.1.4 Method DMiniature Internal Mix(6.5).6.2 Internal Mixer for Initial and Final Mix(Method A):6.2.1 For general mixing procedures refer to PracticeD3182.6.2.2 Mixing Cycle for Internal Mixer Initial Mix(MethodsA,B)See 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 Pass the batch immediately through the standardlaboratory mill three times,with a mill opening of 6.0 mm(0.25 in.)and roll temperature of 40 6 5C(104 6 9F).6.2.2.3 Allow the batch to rest for 1 to 24 h.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 1975.Last previous edition approved in 2011 as D3403 07(2011).DOI:10.1520/D3403-07R16.2For 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 6.2.3 Mixing Cycle for Internal Mixer Final Mix(MethodA)See Table 3.6.2.3.1 After mixing according to Table 3,measure andrecord the batch mass.If it differs from the theoretical value bymore than 0.5%,discard the batch.6.2.3.2 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 D5289.6.2.3.3 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 Internal Mixer Initial Mix with Final Mill Mix(MethodB):6.3.1 For general mixing procedures,refer to PracticeD3182.6.3.2 Mixing Cycle for Initial MixFollow the procedureoutlined in 6.2.2.6.3.3 Mixing Cycle for Mill Final Mix(Method B)SeeTable 4.6.3.3.1 After mixing according to Table 4,measure andrecord the batch mass.If it differs