ASTM_D_3848_-_03_2013.pdf

Designation:D384803(Reapproved 2013)Standard Test Methods forRubberEvaluation of NBR(Acrylonitrile-ButadieneCopolymers)Mixed With Carbon Black1This standard is issued under the fixed designation D3848;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,testformula,mixing procedures,and test methods for the evalua-tion of acrylonitrile-butadiene rubber(NBR)mixed with car-bon black.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-ometers3.Significance and Use3.1 These test methods are mainly intended 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 samples in astandard test formula.3.2 These test methods may also be used to obtain values forcustomer acceptance of rubber.4.Standard Test Formula4.1 Standard Formula:IRM/SRMSRMQuantity,PartsMaterialNo.By MassMasterbatch.100.00+XAZinc oxideB3.00Sulfur,coatedC.1.50Stearic acidB1.00TBBSDB0.70+XTotal mass106.20+XBatch factorsMillEMiniature internal mixerFAX=parts carbon black per 100 parts base polymer.BUse current IRM/SRM.CThe use of 2%MgCO3coated sulfur is recommended.Standard 2%MgCO3coated sulfur Lot No.M266573-P is available from C.P.Hall Co.,4460 HudsonDrive,Stow,OH 44224.DN-tert-butyl-2-benzothiazolesulfenamide.EFor mill mixing,a batch factor should be selected to the nearest 0.5 to give aslarge as total mass as possible that will not exceed 525.0 g.Calculate all parts tothe nearest 0.01 part.Weigh the masterbatch to the nearest 1 g,the sulfur and theaccelerator to the nearest 0.02 g,and all the other compounding materials to thenearest 0.1 g.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 1980.Last previous edition approved in 2009 as D3848 03(2009).DOI:10.1520/D3848-03R13.2For 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 FFor MIM mix,select a batch factor to give a batch that will fill the mixing chambervolume to 75%capacity.Calculate all parts to the nearest 0.1 g,the compoundingmaterial blend to the nearest 0.01 g,and the individual compounding materials,ifused,to the nearest 0.001 g.For the MIM procedure,it is recommended that a blend of compoundingmaterials be prepared to improve accuracy in the weighing of the materials.Thecompound material blend is prepared by blending a proportional mass of eachmaterial in a biconical or a vee blender.A mortar and pestle may be used forblending small quantities.5.Sample Preparation5.1 Obtain and prepare the test samples in accordance withPractice D3896.6.Mixing Procedures6.1 Three mixing procedures are provided as follows:6.1.1 Method AMill Mix(6.2)and6.1.2 Method BMiniature Internal Mixer Mix(6.3).6.1.3 Method CInternal MixerNOTE1It is not implied that comparable results will be obtained bythese test methods.6.2 Method AMill Mix Procedure:6.2.1 For general mixing procedures,refer to PracticeD3182.6.2.2 Mixing CycleInitial Mix:Accu-Dura-mula-tion,tive,minmin6.2.2.1With the mill roll temperature set at 50 5C(122 9F)and the mill opening set at 1.40mm(0.055 in.),band the masterbatch on theslow roll without cut