ASTM_D_3190_-_06_2010.pdf

Designation:D319006(Reapproved 2010)Standard Test Method forRubberEvaluation of Chloroprene Rubber(CR)1This standard is issued under the fixed designation D3190;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 This test method covers the standard materials,testformulas,mixing procedures and test methods for evaluationand quality control testing of chloroprene rubbers(CR).CRcan be generally classified according to the two types ofpolymerization modifiers used in their manufacture:sulfurmodified types and mercaptan modified types.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: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.Summary of Test Method3.1 Separate standard gum or carbon black filled formula-tions,or both,using different samples of CR,are prepared ona laboratory mill or in a Miniature Internal Mixer(MIM)inaccordance with Practice D3182.3.2 See Test Method D1646 for Mooney scorch times andTest Method D2084 or D5289 for cure meter data of theformulations.3.3 Tensile sheets for stress/strain testing are vulcanized inaccordance with Practice D3182 and 100 and 300%modulus,tensile strength and elongation at break are measured inaccordance with Test Method D412.4.Significance and Use4.1 This test method is intended for referee purposes,butmay be used for quality control,research and developmenttesting and comparison of different rubber samples in astandard formula.4.2 This test method may also be used to obtain values forcustomer acceptance of rubber.4.3 This test method is a revision of Test Methods D3190(prior to 1991),with 3-methyl thiazolidine thione-2 beingsubstituted for ethylene thiourea(ETU),a suspected carcino-gen.5.Standard Test Formulae5.1 The Standard Test Formulae are shown in Table 1.Formulae Nos.1 and 2 shall be used for sulfur modified CRand Nos.3 and 4 for mercaptan modified CR.6.Sample Preparation6.1 Obtain and prepare the test samples in accordance withPractice D3896.7.Mixing Procedure7.1 The following three mixing procedures are offered:7.1.1 Mill Method AFor Formulae Nos.1 and 2.7.1.2 Mill Method BFor Formulae Nos.3 and 4.1This test method is under the jurisdiction of ASTM Committee D11 on Rubberand is the direct responsibility of Subcommittee D11.23 on Synthetic Rubbers.Current edition approved Dec.1,2010.Published February 2011.Originallyapproved in 1973.Last previous edition approved in 2006 as D3190 06.DOI:10.1520/D3190-06R10.2For 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 7.1.3 Miniature Internal Mixer MethodFor Formulae Nos.1,2,3 and 4.7.1.4 Laboratory BanburyAll FormulaeNOTE1It is not implied that comparable results will be obtained bythese methods.NOTE2The indicated mill openings are desired and should bemaintained in so far as possible to provide a standard for breakdown of therubber due to milling.7.2 Raw Rubber Preparation:7.2.1 With the mill roll temperature maintained at 50 6 5C(122 6 9F),set the mill opening at 1.5 mm(0.060 in.)andband 320 g of CR on the slow roll for 6 min.Adjust the millopening to maintain a rolling bank approximately 12.5 mm(0.5in.)in diameter.7.2.2 Remove the rubber from the mill,allow to cool toroom temperature and weigh an amount equal to 300 g prior tomixing.7.3 Mill Method AProcedure for Formulae Nos.1 and 2(sulfur modified CR).See Table 2.7.3.1 For general mixing,weighing and vulcanization pro-cedures,refer to