ASTM_D_1418_-_10a.pdf

Designation:D141810aStandard Practice forRubber and Rubber LaticesNomenclature1This standard is issued under the fixed designation D1418;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.This standard has been approved for use by agencies of the Department of Defense.INTRODUCTIONThe system of designating rubbers and rubber latices in this practice was developed in 1955 toreplace designations GR-A,GR-I,GR-M,GR-S and GR-T(standing for“Government Rubber”:A-acrylontrile,I-isobutylene,S-styrene,M-monochlorobutadiene and T-thiosulfide),used for syn-thetic rubbers made in government owned plants.The system was designed to be a genericclassification of the rubber polymers that would accommodate both existing and future rubbers.Thechemical composition of the polymer chain was selected as the best classification proposal to achievethis goal.The rubber polymers were divided into eight classes as described in Section 3 of thispractice.The letter symbol for the class was given last in the designation for the rubber.Preceding theclass symbol were letter symbols to designate either the monomers used to prepare the polymer or thesubstituent groups on the polymer chain.The system has been successful both in accommodating themany new polymers developed since 1955 and in conveying to the user certain characteristics of therubber associated with the chemical composition.1.Scope1.1 This practice covers a system of general classificationfor the basic rubbers both in dry and latex forms determinedfrom the chemical composition of the polymer chain.1.2 The purpose of this practice is to provide a standardiza-tion of terms for use in industry,commerce,and governmentand is not intended to conflict with but rather to act as asupplement to existing trade names and trademarks.1.3 In technical papers or presentations the name of thepolymer should be used if possible.The symbols can followthe chemical name for use in later references.NOTE1For terms related to thermoplastic elastomers,see PracticeD5538.2.Referenced Documents2.1 ASTM Standards:2D5538 PracticeforThermoplasticElastomersTerminology and Abbreviations3.Rubbers3.1 Rubbers in both dry and latex form shall be classifiedand coded from the chemical composition of the polymer chainin the following manner:MRubbers having a saturated chain of the polymethylenetype.NRubbers having nitrogen,but not oxygen or phosphorus,in the polymer chain.ORubbers having oxygen in the polymer chain.RRubbers having an unsaturated carbon chain,for ex-ample,natural rubber and synthetic rubbers derived at leastpartly from diolefins.QRubbers having silicon and oxygen in the polymerchain.TRubbers having sulfur in the polymer chain.URubbers having carbon,oxygen,and nitrogen in thepolymer chain.ZRubbers having phosphorus and nitrogen in the polymerchain.4.Class Designations4.1 The“M”class includes rubbers having a saturated chainof the polymethylene type.The following classification shallbe used:ACMCopolymers of ethyl or other acrylate and a smallamount of monomer which facilitates vulcanization.AEMCopolymers of ethyl or other acrylates and ethylene.1This practice is under the jurisdiction ofASTM Committee D11 on Rubber andis the direct responsibility of Subcommittee D11.08 on Terminology.Current edition approved Oct.1,2010.Published November 2010.Originallyapproved in 1956.Last previous edition approved in 2010 as D1418 10.DOI:10.1520/D1418-10A.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 ANMCopolymers of ethyl or other acrylate and acryloni-trile.BIMSMBrominated polymers derived from a copolymerof isobutylene and p-methylstyrene.CMChloro-polyethylene.CFMPolychloro-trifluoro-ethylene.CSMChloro-sulfonyl-polyethylene.EOMCopolymers of ethylene and an octene.EPDMTerpolymer of ethylene,propylene,and a dienewith the residual unsaturated portion of the diene in the sidechain.EPMCopolymers of ethylene and propylene.EVMCopolymers of ethylene and vinyl acetate.FEPMA fluoro rubber of the polymethylene type onlycontaining one or more of the monomeric alkyl,perfluoroalkyl,and/or perfluoroalkoxy groups,with or without a cure sitemonomer(having a reactive pendant group).FFKMPerfluorinated rubbers of the polymethylene typehaving all fluoro,perfluoroalkyl,or perfluoroalkoxy substituentgroups on the polymer chain;a small fraction of these groupsmay contain functionality to facilitate vulcanization.FKMFluoro rubber of the polymethylene type that utilizesvinylidene fluoride as a comonomer and has su