ASTM_D_3187_-_06_2011.pdf

Designation:D318706(Reapproved 2011)Standard Test Methods forRubberEvaluation of NBR(Acrylonitrile-ButadieneRubber)1This standard is issued under the fixed designation D3187;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,testformulas,mixing procedures and test methods for the evalua-tion of various types of acrylonitrile-butadiene rubber(NBR).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 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 control acceptance of rubber.4.Standard Test Formula4.1 Standard FormulaSee Table 1.5.Sample Preparation5.1 For tests intended for referee purposes obtain andprepare the test 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.6.2 Mill Procedure:6.2.1 For general mixing procedure refer to Practice D3182.6.2.1.1 Mix with the mill roll temperature maintained at 506 5C(122 6 9F).The indicated mill openings are desiredand should be maintained in so far as possible to provideuniformity in the breakdown of the rubber due to milling.Necessary adjustments may be made to maintain a goodworking bank.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 accordancewith Test Methods D1646 or D6204,and vulcanization char-acteristics in accordance with Test Methods D2084 or D5289.1These 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.1,2011.Published January 2012.Originallyapproved in 1973.Last previous edition approved in 2006 as D3187 06.DOI:10.1520/D3187-06R11.2For 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 6.2.2.3 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 Miniature Internal Mixer(MIM)Procedure:6.3.1 For general mixing procedure refer to Practice D3182.6.3.1.1 Mix with the head temperature of the miniatureinternal mixer maintained at 60 6 3C(140 6 5F)and therotor speed at 6.3 to 6.6 rad/s(60 to 63 r/min).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 that will give an approximately 5 mm(0.2 in.)thicksheet.Cut the sheet into strips that are approximately 25 mm(1in.)wide.6.3.3 Mixing CycleSee Table 3.6.3.3.1 After mixing according to Table 3,turn off themotor,raise the ram,remove the mixing chamber and dis-charge the batch.Record the maximum batch temperatureindicated,if desired.6.3.3.2 Immediately pass the discharge from the mixertwice through a standard mill main