ASTM_D_3568_-_03_2013.pdf

Designation:D356803(Reapproved 2013)Standard Test Methods forRubberEvaluation of EPDM(Ethylene Propylene DieneTerpolymers)Including Mixtures With Oil1This standard is issued under the fixed designation D3568;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 specify the standard materials,testformulas,mixing procedures,and test methods for the evalu-ation and production control of ethylene propylene dienerubbers(EPDM).1.2 The values stated in SI units are to be regarded as thestandard.The values in parentheses are for information only.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:2D88 Test Method for Saybolt ViscosityD412 Test Methods for Vulcanized Rubber and Thermoplas-tic ElastomersTensionD1646 TestMethodsforRubberViscosity,StressRelaxation,andPre-VulcanizationCharacteristics(Mooney Viscometer)D2084 Test Method for Rubber PropertyVulcanizationUsing Oscillating Disk Cure MeterD2161 Practice for Conversion of Kinematic Viscosity toSaybolt Universal Viscosity or to Saybolt Furol ViscosityD2501 Test Method for Calculation of Viscosity-GravityConstant(VGC)of Petroleum OilsD3182 Practice for RubberMaterials,Equipment,and Pro-cedures for Mixing Standard Compounds and PreparingStandard Vulcanized SheetsD3896 Practice for Rubber From Synthetic SourcesSamplingD3900 Test Methods for RubberDetermination of Ethyl-ene Units in Ethylene-Propylene Copolymers(EPM)andin Ethylene-Propylene-Diene Terpolymers(EPDM)byInfrared SpectrometryD4483 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 intended mainly for refereepurposes but may be used for quality control of rubberproduction.They may also be used in research and develop-ment work and for comparison of different rubber samples in astandard formula.3.2 These test methods may be used to obtain values forcustomer acceptance of rubber.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 Nov.1,2013.Published January 2014.Originallyapproved in 1977.Last previous edition approved in 2009 as D3568 03(2009).DOI:10.1520/D3568-03R13.2For 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 4.Standard Test Formulas4.1 Standard Formulas:3,4MaterialFormula No.NISTSRM/IRMNo.QualityParts by Mass123EPDM.100.00100.00100.00+YAZinc oxideBIRM 915.005.005.00SulfurB3711.501.501.50Stearic acidB3721.001.001.00Oil furnace blackCDSRB-B480.00100.0080.00ASTM Type 103 petroleum oilDE.50.0075.0050.00 YATetramethylthiuramdisulfide(TMTD)BIRM 1F1.001.001.00Mercaptobenzothiazole(MBT)B3830.500.500.50Total239.00284.00239.00Batch factorGMill2.02.02.0Internal mixer5.54.25.5MIM(Cam Head)0.290.250.230.29HMIM(Banbury Head)0.250.210.200.26HAY=partsoil by mass per 100 parts base polymer in masterbatch.If Y is greaterthan 50 parts oil,do not add oil to Formula 3.BFor the MIM procedure,it is recommended that a blend of compoundingmaterials be prepared to improve accuracy in the weighing of these materials.This“compounding material blend”is prepared by blending a proportional mass of eachmaterial,except carbon black and oil,in a dry powder blender such as a biconicalblender or vee blender.A mortar and pestile or blender may be used for blendingsmall quantities.3CThe current Industry Reference Black may be used in place of NIST 378,although slightly different results may be obtained.DFor the MIM procedure,it is recommended that a blend of carbon black and oilbe prepared to improve accuracy in the weighing and addition of these materials.This“black/oil blend”is prepared by adding a proportional mass of oil to a cavityprepared in a proportional mass of carbon black,covering the oil with thesurrounding black and then gently whipping until uniformly blended.Let stand 24h and blend again before using.4EViscosity is 16.8 1.2 mm2/s at 100C in accordance with Test Method D88 andPracti