1、Designation:D677820Standard Classification System and Basis for Specification forPolyoxymethylene Molding and Extrusion Materials(POM)1This standard is issued under the fixed designation D6778;the number immediately following the designation indicates the year oforiginal adoption or,in the case of r
2、evision,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 classificati
3、on system covers polyoxymethylene ma-terials suitable for molding and extrusion.This classificationsystem allows for the use of polyoxymethylene plastic mate-rials that are recycled,reconstituted,recycled-regrind,recovered,or reprocessed,or combination thereof,providedthat the requirements as stated
4、 in this specification are met.Itis the responsibility of the supplier and the buyer of recycled,reconstituted,recycled-regrind,recovered,or reprocessedpolyoxymethylene plastic materials,or combination thereof,toensure compliance.(See Guide D7209).1.2 The properties included in this standard are tho
5、serequired to identify the compositions covered.Other require-ments necessary to identify particular characteristics importantto specialized applications are to be specified by using suffixesas given in Section 5.1.3 This classification system and subsequent line callout(specification)are intended t
6、o provide a means of calling outplastic materials used in the fabrication of end items or parts.It is not intended for the selection of materials.Materialselection can be made by those having expertise in the plasticfield only after careful consideration of the design and theperformance required of
7、the part,the environment to which itwill be exposed,the fabrication process to be employed,thecosts involved,and the inherent properties of the material otherthan those covered by this standard.1.4 The values stated in SI units are to be regarded as thestandard.1.5 The following precautionary caveat
8、 pertains only to thetest method portion,Section 11,of this classification 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,health,and environmental practices
9、 and determine the appli-cability of regulatory limitations prior to use.NOTE1This classification system is similar to ISO 29988-1/-2,although the technical content is significantly different.1.6 This international standard was developed in accor-dance with internationally recognized principles on s
10、tandard-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:2D618 Practice for Conditioning Plastics for Te
11、stingD883 Terminology Relating to PlasticsD1600 Terminology forAbbreviated Terms Relating to Plas-ticsD3892 Practice for Packaging/Packing of PlasticsD4000 Classification System for Specifying Plastic Materi-alsD5630 Test Method for Ash Content in PlasticsD7209 Guide for Waste Reduction,Resource Rec
12、overy,andUse of Recycled Polymeric Materials and Products(With-drawn 2015)3D6100 Specification for Extruded,Compression Molded andInjection Molded Polyoxymethylene Shapes(POM)E29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications2.2 ISO Standards:4ISO 75-1
13、 PlasticsDetermination of Temperature of De-flection under LoadPart 1:General Test MethodISO 75-2 PlasticsDetermination of Temperature of De-flection under LoadPart 2:Plastics and EboniteISO 179-1 PlasticsDetermination of Charpy ImpactPropertiesPart 1:Non-instrumented Impact TestISO 294-1 PlasticsIn
14、jection Moulding of Test Specimensof Thermoplastic MaterialsPart 1:General Principles,1This classification is under the jurisdiction of ASTM Committee D20 onPlastics and is the direct responsibility of Subcommittee D20.15 on ThermoplasticMaterials.Current edition approved Feb.1,2020.Published March
15、2020.Originallyapproved in 2002.Last previous edition approved in 2014 as D6778-14.DOI:10.1520/D6778-20.2For 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 Doc
16、ument Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recogni