ASTM D1418 PDF

A number in parentheses indicates the year of last reapproval. A superscript epsilon? This standard has been approved for use by agencies of the Department of Defense. The system was designed to be a generic classi? The chemical composition of the polymer chain was selected as the best classi? The rubber polymers were divided into eight classes as described in Section 3 of this practice.

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A number in parentheses indicates the year of last reapproval. This standard has been approved for use by agencies of the U. Department of Defense. 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 and in conveying to the user certain characteristics of therubber associated with the chemical composition.

The symbols can followthe chemical name for use in later references. Referenced Documents2. N—Rubbers having nitrogen, but not oxygen or phosphorus,in the polymer chain. O—Rubbers having oxygen in the polymer chain. R—Rubbers having an unsaturated carbon chain, forexample, natural rubber and synthetic rubbers derived at leastpartly from diolefins. Q—Rubbers having silicon and oxygen in the polymerchain. T—Rubbers having sulfur in the polymer chain.

U—Rubbers having carbon, oxygen, and nitrogen in thepolymer chain. Z—Rubbers having phosphorus and nitrogen in the polymerchain.

Class Designations4. The following classification shallbe used:ACM—Copolymers of ethyl or other acrylate and a smallamount of monomer which facilitates vulcanization.

Current edition approved Jan. Published January Originallyapproved in Last previous edition approved in as D — 10a DOI: ANM—Copolymers of ethyl or other acrylate and acryloni-trile.

EOM—Copolymers of ethylene and an octene. EPDM—Terpolymer of ethylene, propylene, and a dienewith the residual unsaturated portion of the diene in the sidechain. EPM—Copolymers of ethylene and propylene. EVM—Copolymers of ethylene and vinyl acetate. FFKM—Perfluorinated 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.

FKM—Fluoro rubber of the polymethylene type that utilizesvinylidene fluoride as a comonomer and has substituent fluoro,alkyl, perfluoroalkyl or perfluoroalkoxy groups on the polymerchain, with or without a cure site monomer having a reactivependant group. Type 1—Dipolymer of hexafluoropropylene and vinylidenefluoride. Type 2—Terpolymer of tetrafluoroethylene, vinylidenefluoride, and hexafluoropropylene.

Type 3—Terpolymer of tetrafluoroethylene, a fluorinatedvinyl ether, and vinylidene fluoride. Type 4—Terpolymer of tetrafluoroethylene, propylene andvinylidene fluoride.

Type 5—Pentapolymer of tetrafluoroethylene,hexafluoropropylene, vinylidene fluoride, ethylene, and a fluo-rinated vinyl ether. Type 6—Copolymer of vinylidene fluoride and 2,3,3,3-tetrafluoropropene. IM—Polyisobutylene not curable. The following classification shall be used:CO—Polychloromethyl oxirane epichlorohydrin polymer.

ECO—Ethylene oxide oxirane and chloromethyl oxirane epichlorohydrin copolymer. GECO—Epichlorohydrin-ethylene oxide-allylglycidyletherterpolymer.

GPO—Polypropylene oxide and allyl glycidyl ether. The letterimmediately preceding the letter R shall signify the diolefinfrom which the rubber was prepared except for naturalrubber. Any letter or letters preceding this diolefin lettersignifies the comonomer or comonomers. A parenthetical letter S , for solution, or E , for emulsion, is used to indicatewhether the rubber or latex was prepared by solution oremulsion polymerization.

ENR—Epoxidized natural rubber. ENR-G—Epoxidized guayule natural rubber. HNBR—Hydrogenated acrylonitrile-butadiene. IR—Isoprene, synthetic. NR—Natural rubber. NR-G—Guayule natural rubber. SIR—Styrene-isoprene rubbers. The M preceding the Q indicates that methyl is one of thesubstituent groups on the polymer chain. FMQ—Silicone rubber having both methyl and fluorinesubstituent groups on the polymer chain.

FVMQ—Silicone rubber having fluorine, vinyl, and methylsubstitute groups on the polymer chain. PMQ—Silicone rubbers having both methyl and phenylsubstituent groups on the polymer chain. PVMQ—Silicone rubbers having methyl, phenyl, and vinylsubstituent groups on the polymer chain.

MQ—Silicone rubbers having only methyl substituentgroups on the polymer chain, such as dimethyl polysiloxane. VMQ—Silicone rubber having both methyl and vinyl sub-stituent groups on the polymer chain. The following classificationshall be used:AFMU—Terpolymer of tetrafluoroethylene,trifluoronitrosomethane, and nitrosoperfluorobutyric acid.

AU—Polyester urethane. EU—Polyether urethane. The following classificationshall be used:FZ—A rubber having a -P CxN- chain and having fluoro-alkoxy groups attached to the phosphorus atoms in the chain. PZ—A rubber having a -P CxN- chain and having aryloxy phenoxy and substituted phenoxy groups attached to thephosphorus atoms in the chain. This appendix will serve as ahistorical reference. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.

This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters.

Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.

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EOM—Copolymers of ethylene and an octene. N—Rubbers having nitrogen, but not oxygen or phosphorus, EPDM—Terpolymer of ethylene, propylene, and a diene in the polymer chain. Current edition approved May 10, Published Julyl Originally monomer having a reactive pendant group. Last previous edition D —

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