1、Designation:D318411(Reapproved 2022)Standard Practice forRubberEvaluation of NR(Natural Rubber)1This standard is issued under the fixed designation D3184;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A num
2、ber in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers the standard materials,testformulas,mixing procedures,and test methods for the evalu-ation and production control of natu
3、ral rubber(NR).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 es
4、tablish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles
5、 for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D412 Test Methods for Vulcanized Rubber and Thermoplas-tic ElastomersTensionD1485 Practice for Rubber f
6、rom Natural SourcesSampling and Sample PreparationD1646 TestMethodsforRubberViscosity,StressRelaxation,andPre-VulcanizationCharacteristics(Mooney Viscometer)D2084 Test Method for Rubber PropertyVulcanizationUsing Oscillating Disk Cure MeterD3182 Practice for RubberMaterials,Equipment,and Pro-cedures
7、 for Mixing Standard Compounds and PreparingStandard Vulcanized SheetsD4483 Practice for Evaluating Precision for Test MethodStandards in the Rubber and Carbon Black ManufacturingIndustries3.Significance and Use3.1 This practice is mainly intended for referee purposes butmay be used for quality cont
8、rol of rubber production.It mayalso be used in research and development work and forcomparison of different rubber samples in a standard formula.4.Standard Test Formulas4.1 Standard Formulas:Quantity,Parts by Mass,and Formula No.MaterialIndustryReferenceMaterial No.1A Gum2A BlackFilled3AAGumNatural
9、rubber.100.00100.00100.00Zinc oxide0916.005.006.00Sulfur0313.502.253.50Stearic acid0210.502.000.50Oil furnaceblackBIRB#7.35.00.Mercaptobenzothiazole0020.50.TBBSC003.0.700.70Total110.50144.95110.70Batch factor:DMill3.03.03.0Miniature internalmixer:ECam Head0.570.480.57Banbury Head0.500.420.50ARecomme
10、nded formula for Test Method D2084 vulcanization characteristicsusing oscillating disk cure meter.BThe current Industry Reference Black may be used in place of NIST 378,although slightly different results may be obtained.CN-tert-butyl-2-benzothiazole sulfenamide.DFor mill mixes,weigh the rubber and
11、carbon black to the nearest 1.0 g,the sulfurand accelerators to the nearest 0.02 g,and all other compounding materials to thenearest 0.1 g.EFor MIM batches weigh the rubber carbon black to the nearest 0.1 g,thecompounding material blend to the nearest 0.01 g,and individual compoundingmaterials,if us
12、ed,to the nearest 0.001 g.For the MIM procedure,it is recom-mended that a blend of compounding materials,including black,be prepared toimprove accuracy in the weighing of these materials.This material blend is pre-pared by blending a proportional mass of each material in a dry powder such as abiconi
13、cal blender or vee blender.A mortar and pestle may be used for blendingsmall quantities.5.Sample Preparation5.1 For tests intended for referee purposes obtain andprepare the samples in accordance with Test Methods D1485.1This practice is under the jurisdiction ofASTM Committee D11 on Rubber andRubbe
14、r-like Materials and are the direct responsibility of Subcommittee D11.22 onNatural Rubber.Current edition approved Oct.1,2022.Published October 2022.Originallyapproved in 1973.Last previous edition approved in 2018 as D3184 11(2018).DOI:10.1520/D3184-11R22.2For referenced ASTM standards,visit the A
15、STM 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 States
16、This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.16.Mixing Procedures6.1 The following three mixing procedures are offered asfollows:6.1.1 Mill Method AFor gum formulas 1A and 3A.6.1.2 Mill Method BFor black formula 2A.6.1.3 MIM Method