1、Designation: D 6778 06Standard Classification forPolyoxymethylene (POM, Acetal) Molding and ExtrusionMaterials1This standard is issued under the fixed designation D 6778; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of
2、last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This classification covers polyoxymethylene materialssuitable for molding and extrusion. This specification allowsfo
3、r the use of polyoxymethylene plastic materials that arerecycled, reconstituted, recycled-regrind, recovered, or repro-cessed, or combination thereof, provided that the requirementsas stated in this specification are met. It is the responsibility ofthe supplier and the buyer of recycled, reconstitut
4、ed, recycled-regrind, recovered, or reprocessed polyoxymethylene plasticmaterials, or combination thereof, to ensure compliance. (SeeGuide D 5033).1.2 The properties included in this classification are thoserequired to identify the compositions covered. There may beother requirements necessary to id
5、entify particular character-istics important to specialized applications. These may bespecified by using the suffixes as given in Section 5.1.3 This classification and subsequent line callout are in-tended to provide a means of calling out plastic materials usedin the fabrication of end items or par
6、ts. It is not intended for theselection of materials. Material selection should be made bythose having expertise in the field of plastics design aftercareful consideration of the design and the performancerequired of the part, the environment to which it will beexposed, the fabrication process to be
7、 employed, the costsinvolved, and the inherent properties of the material other thanthose covered by this classification.1.4 The values stated in SI units are to be regarded as thestandard.1.5 The following precautionary caveat pertains only to thetest method portion, Section 11, of this classificat
8、ion. Thisstandard does not purport to address all of the safety concerns,if any, associated with its use. It is the responsibility of the userof this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory require-ments prior to use.NOTE 1This class
9、ification is similar to ISO 9988-1 and 9988-2,although the technical content is significantly different.2. Referenced Documents2.1 ASTM Standards:2D 618 Practice for Conditioning Plastics for TestingD 883 Terminology Relating to PlasticsD 1600 Terminology for Abbreviated Terms Relating toPlasticsD 3
10、641 Practice for Injection Molding Test Specimens ofThermoplastic Molding and Extrusion MaterialsD 3892 Practice for Packaging/Packing of PlasticsD 4000 Classification System for Specifying Plastic Mate-rialsD 5033 Guide for Development of ASTM Standards Relat-ing to Recycling and Use of Recycled Pl
11、asticsD 6100 Specification for Extruded, Compression Moldedand Injection Molded Acetal Shapes (POM)E29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications2.2 ISO Standards:3ISO 75-1 Plastics and EboniteDetermination of Tempera-ture of Deflection under LoadP
12、art 1: General TestMethodsISO 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 PlasticsInjection Moulding Of Test SpecimensOf Thermoplastic MaterialsP
13、art 1: General Principles,and Moulding of Multipurpose and Bar Test SpecimensISO 527-1 PlasticsDetermination of Tensile PropertiesPart 1: General PrincipalsISO 527-2 PlasticsDetermination of Tensile PropertiesPart 2: Test Conditions for Moulding and ExtrusionPlasticsISO 1133 PlasticsDetermination of
14、 the Melt Mass FlowRate (MFR) and the Melt Volume-Flow Rate (MVR) ofThermoplastics1This classification is under the jurisdiction of ASTM Committee D20 onPlastics and is the direct responsibility of Subcommittee D20.15 on ThermoplasticMaterials.Current edition approved Nov. 1, 2006. Published Novembe
15、r 2006. Originallyapproved in 2002. Last previous edition approved in 2005 as D 6778 - 05.2For 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 Sum
16、mary page onthe ASTM website.3Available from American National Standards Institute, 25 W. 43rd St., 4thFloor, New York, NY 10036.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, Unit
17、ed States.ISO 11357-3 PlasticsDifferential Scanning Calorimetry(DSC)Part 3: Determination of Temperature and En-thalpy of Melting and CrystallizationISO 1183 PlasticsMethods for Determining the Densityand Relative Density of Non-Cellular PlasticsISO 3167 PlasticsMultipurpose Test SpecimensISO 9988-1
18、 PlasticsPolyoxymethylene (POM) Mouldingand Extrusion MaterialsPart 1: Designation System andBasis for SpecificationsISO 9988-2 PlasticsPolyoxymethylene (POM) Mouldingand Extrusion MaterialsPart 2: Preparation of TestSpecimens and Determination of PropertiesTABLE POM Polyoxymethylene Materials, Deta
19、il Requirements (Natural and Black Color Only)A,B,CGroup Description Class Description Grade DescriptionFlow RateISO 1133,D,EG/10 minMeltingPoint,ISO11357-3FC, minDensity,ISO 1183,g/cm3TensileStrength,ISO 527,GMPa, minTensileModulus,ISO 527HMPa, minCharpyImpactResistance,ISO 179I/1eA, kJ/m2,minDefle
20、ctionTemperature,ISO 75/Method AfJ1.82 MPa,C, min01 Homopolymer 1 general purpose andhigh flow1 4 215 90 300 6 100Homopolymer, impactmodified, MFR 4 205 90 200 6 100Copolymer impactmodified205 80 200 6 100Copolymer, MFR 4 205 90 140 6 100Copolymer, high modulus, MFR 4 210 100 140 6 100D6778065SUMMAR
21、Y OF CHANGESCommittee D20 has identified the location of selected changes to this standard since the last issue,D 6778 - 05, that may impact the use of this standard. (November 1, 2006)(1) Added Specification D 6100 to 2.1.(2) Added Note 7 at the end of Section 4.Committee D20 has identified the loc
22、ation of selected changes to this standard since the last issue,D 6778 - 03, that may impact the use of this standard. (July 1, 2005)(1) Added a new grade POM0241 to Table POM.(2) Added a new molding condition for POM0241 to Table 1.(3) Corrected an error in Footnote E in Tables A and B.ASTM Interna
23、tional takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. 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 th
24、eir 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
25、 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 Standa
26、rds, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).D6778066
