1、Designation:D463411aStandard Classification System and Basis for Specification forStyrene-Maleic Anhydride Molding and Extrusion Materials(S/MA)1This standard is issued under the fixed designation D4634;the number immediately following the designation indicates the year oforiginal adoption or,in the
2、 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 U.S.Department of Defense.1.Scope*1.1 This cl
3、assification system covers styrene-maleic anhy-dride materials suitable for molding or extrusion.This classi-fication system does not apply to alloys or blends of styrene-maleicanhydridematerialswithnon-elastomericthermoplastics.Styrene-maleic anhydride materials,beingthermoplastic,are reprocessable
4、 and recyclable.This classifi-cation system allows for the use of those materials providedthat all the specific requirements of this classification systemare met.1.2 The properties included in this standard are thoserequired to identify the compositions covered.Other require-ments necessary to ident
5、ify particular characteristics importantto specialized applications are to be specified by using thesuffixes as given in Section 5.1.3 This classification system and subsequent line call out(specification)are intended to provide means of calling outproperties of plastic materials used in the fabrica
6、tion of enditems or parts.It is not intended for the selection of materials.Materials should be selected by those having expertise in theplastics field after careful consideration of the design and theperformance required of the part,the environment to which itwill be exposed,the fabrication process
7、 to be employed,costsinvolved,and the inherent properties of the material other thanthose covered by this classification system.1.4 The values stated in SI units are to be regarded as thestandard.1.5 The following precautionary caveat pertains only to thetest methods portion,Section 11,of this class
8、ification system.This standard does not purport to address all of the safetyconcerns,if any,associated with its use.It is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use.NOTE1Ther
9、e is no known ISO equivalent to this standard.2.Referenced Documents2.1 ASTM Standards:2D256 Test Methods for Determining the Izod PendulumImpact Resistance of PlasticsD618 Practice for Conditioning Plastics for TestingD638 Test Method for Tensile Properties of PlasticsD648 Test Method for Deflectio
10、n Temperature of PlasticsUnder Flexural Load in the Edgewise PositionD790 Test Methods for Flexural Properties of Unreinforcedand Reinforced Plastics and Electrical Insulating Materi-alsD883 Terminology Relating to PlasticsD1525 Test Method for Vicat Softening Temperature ofPlasticsD1600 Terminology
11、 forAbbreviated Terms Relating to Plas-ticsD3641 Practice for Injection Molding Test Specimens ofThermoplastic Molding and Extrusion MaterialsD3892 Practice for Packaging/Packing of PlasticsD4000 Classification System for Specifying Plastic Materi-alsE29 Practice for Using Significant Digits in Test
12、 Data toDetermine Conformance with Specifications2.2 Military Standard:3MIL-STD-1916 DOD Preferred Methods for Acceptance ofProduct2.3 Underwriters Laboratories Standard:4UL 94 Standard for Tests for Flammability for Parts inDevices and Appliances1This classification system is under the jurisdiction
13、 ofASTM Committee D20 onPlastics and is the direct responsibility of Subcommittee D20.15 on ThermoplasticMaterials.Current edition approved Sept.1,2011.Published September 2011.Originallyapproved in 1986.Last previous edition approved in 2011 as D4634-11.DOI:10.1520/D4634-11A.2For referenced ASTM st
14、andards,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.3Available from Standardization Documents Order Desk,DODSSP,Bldg.4,SectionD,700RobbinsAve
15、.,Philadelphia,PA19111-5098,http:/dodssp.daps.dla.mil.4Available from Underwriters Laboratories(UL),333 Pfingsten Rd.,Northbrook,IL 60062-2096,http:/.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 1
16、9428-2959.United States1 3.Terminology3.1 The terminology used in this classification system is inaccordance with Terminologies D883 and D1600.4.Classification4.1 Styrene-maleic anhydride materials are classified intogroups according to their use either for injection molding,orfor extrusion.These groups are subdivided into classes andgrades,as shown in Table S/MA.NOTE2An example of this classification system is as follows:Thedesignation S/MA 211 would indicate:S/MA=Styrene-maleic anhydride,2=inj
