ASTM_D_3900_-_17_2021.pdf

Designation:D390017(Reapproved 2021)Standard Test Methods forRubberDetermination of Ethylene Units in Ethylene-Propylene Copolymers(EPM)and in Ethylene-Propylene-Diene Terpolymers(EPDM)by Infrared Spectrometry1This standard is issued under the fixed designation D3900;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 determination of theproportion of ethylene and propylene units in ethylene-propylene copolymers(EPM)and ethylene-propylenedieneterpolymers(EPDM)over the range from 35 to 85 mass%ethylene.Four test methods are needed to encompass thevariety of commercial polymers that contain additives orpolymerized diene units that interfere with the various infraredpeaks.Except when interferences are present,all four testmethods should give similar results.The test methods appear inthe following order:1.1.1 Pressed Film Test Methods:SectionsTest Method AFor EPM and EPDM between 35 and 70mass%ethylene9 14Test Method BFor EPM and EPDM between 60 and 85mass%ethylene,except for ethylene/propylene/1,4-hexadiene terpolymers15 19Test Method CFor all EPM and EPDM polymers between 35and 85 mass%ethylene,using near infrared20 241.1.2 Cast Film Test Methods:Test Method DFor all EPM and EPDM polymers between 35and 85 mass%ethylene,except for ethylene/propylene/1,4-hexadiene terpolymers25 321.2 These test methods are not applicable to oil-extendedEPDM unless the oil is first removed in accordance with TestMethod D.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.4 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles 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:2D297 Test Methods for Rubber ProductsChemical Analy-sisD3568 Test Methods for RubberEvaluation of EPDM(Ethylene Propylene Diene Terpolymers)Including Mix-tures With OilD4483 Practice for Evaluating Precision for Test MethodStandards in the Rubber and Carbon Black ManufacturingIndustriesE168 Practices for General Techniques of Infrared Quanti-tative Analysis3.Summary of Test Methods3.1 Test Method APressed films are measured for theirinfrared absorbance ratios at 8.65/13.85 m(1156/722 cm1),and mass percent ethylene is read from a calibration obtainedfrom standard polymers.NOTE1Peak typically appears at the wavelength indicated,but peakmay shift slightly in its position.3.2 Test Method BThin pressed films are measured fortheir infrared absorbance ratios at or near 7.25/13.85 m(1379/722 cm1),and mass percent ethylene is read from acalibration obtained from standard polymers.3.3 Test Method CPressed films are measured for theirinfrared absorbance ratios at or near 8.65/2.35 m(1156/4255cm1)using near infrared,and mass percent ethylene is readfrom a calibration obtained from standard polymers.1These test methods are under the jurisdiction of ASTM Committee D11 onRubber and Rubber-like Materials and are the direct responsibility of SubcommitteeD11.11 on Chemical Analysis.Current edition approved Nov.1,2021.Published December 2021.Originallyapproved in 1980.Last previous edition approved in 2017 as D3900 157.DOI:10.1520/D3900-17R21.2For 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 StatesThis 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.1?3.4 Test Method DUltra-thin cast films on a salt plate aremeasured for their infrared absorbance ratios at or near7.25/6.85 m(1379/1460 cm1),and mass percent ethylene isread from a calibration obtained from standard polymers.4.Significance and Use4.1 These test methods can be used for determining whichEPDM polymers are evaluated in the different compounds inTest Methods D3568.4.2 Differences in ethylene se