1、Designation: D6778 12D6778 14Standard 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
2、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 U.S. Department of Defense.1. Scope*1
3、.1 This classification system covers polyoxymethylene materials suitable for molding and extrusion. This classification systemallows for the use of polyoxymethylene plastic materials that are recycled, reconstituted, recycled-regrind, recovered, orreprocessed, or combination thereof, provided that t
4、he requirements as stated in this specification are met. It is the responsibilityof the supplier and the buyer of recycled, reconstituted, recycled-regrind, recovered, or reprocessed polyoxymethylene plasticmaterials, or combination thereof, to ensure compliance. (See Guide D7209).1.2 The properties
5、 included in this standard are those required to identify the compositions covered. Other requirementsnecessary to identify particular characteristics important to specialized applications are to be specified by using suffixes as givenin Section 5.1.3 This classification system and subsequent line c
6、allout (specification) are intended to provide a means of calling out plasticmaterials used in the fabrication of end items or parts. It is not intended for the selection of materials. Material selection can bemade by those having expertise in the plastic field only after careful consideration of th
7、e design and the performance required ofthe part, the environment to which it will be exposed, the fabrication process to be employed, the costs involved, and the inherentproperties of the material other than those covered by this standard.1.4 The values stated in SI units are to be regarded as the
8、standard.1.5 The following precautionary caveat pertains only to the test method portion, Section 11, of this classification system. 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
9、 appropriate safety and health practices and determine the applicability of regulatory requirementsprior to use.NOTE 1This classification system is similar to ISO 9988-1/-2, although the technical content is significantly different.2. Referenced Documents2.1 ASTM Standards:2D618 Practice for Conditi
10、oning Plastics for TestingD883 Terminology Relating to PlasticsD1600 Terminology for Abbreviated Terms Relating to PlasticsD3892 Practice for Packaging/Packing of PlasticsD4000 Classification System for Specifying Plastic MaterialsD5630 Test Method for Ash Content in PlasticsD7209 Guide for Waste Re
11、duction, Resource Recovery, and Use of Recycled Polymeric Materials and ProductsD6100 Specification for Extruded, Compression Molded and Injection Molded Polyoxymethylene Shapes (POM)E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications2.2 ISO Standards:
12、3ISO 75-1 PlasticsDetermination of Temperature of Deflection under LoadPart 1: General Test MethodISO 75-2 PlasticsDetermination of Temperature of Deflection under LoadPart 2: Plastics and Ebonite1 This classification is under the jurisdiction of ASTM Committee D20 on Plastics and is the direct resp
13、onsibility of Subcommittee D20.15 on Thermoplastic Materials.Current edition approved May 1, 2012Aug. 1, 2014. Published June 2012September 2014. Originally approved in 2002. Last previous edition approved in 20062012 asD6778 - 06.D6778 - 12. DOI: 10.1520/D6778-12.10.1520/D6778-14.2 For referencedAS
14、TM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. ForAnnual Book ofASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.3 Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4t
15、h Floor, New York, NY 10036, http:/www.ansi.org.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurate
16、ly, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Dri
17、ve, PO Box C700, West Conshohocken, PA 19428-2959. United States1ISO 179-1 PlasticsDetermination of Charpy Impact PropertiesPart 1: Non-instrumented Impact TestISO 294-1 PlasticsInjection Moulding of Test Specimens of Thermoplastic MaterialsPart 1: General Principles, andMoulding of Multipurpose and
18、 Bar Test SpecimensISO 527-1 PlasticsDetermination of Tensile PropertiesPart 1: General PrincipalsISO 527-2 PlasticsDetermination of Tensile PropertiesPart 2: Test Conditions for Moulding and Extrusion PlasticsISO 1133 PlasticsDetermination of the Melt-Mass Flow Rate (MFR) and the Melt Volume-Flow R
19、ate (MVR) ofThermoplasticsISO 11357-3 PlasticsDifferential Scanning Calorimetry (DSC)Part 3: Determination of Temperature and Enthalpy ofMelting and CrystallizationISO 1183 PlasticsMethods for Determining the Density of Non-Cellular PlasticsPart 1: Immersion Method, LiquidPyknometer and Titration Me
20、thodISO 3167 PlasticsMultipurpose Test SpecimensISO 3451-1 PlasticsDetermination of AshPart 1: General MethodsISO 9988-1 PlasticsPolyoxymethylene (POM) Moulding and Extrusion MaterialsPart 1: Designation System and Basis forSpecificationsISO 9988-2 PlasticsPolyoxymethylene (POM) Moulding and Extrusi
21、on MaterialsPart 2: Preparation of Test Specimens andDetermination of PropertiesISO 20753 PlasticsTest Specimens3. Terminology3.1 The terminology used in this classification system is in accordance with Terminologies D883 and D1600.4. Classification4.1 Polyoxymethylene materials are classified into
22、groups according to their composition. These groups are subdivided intoclasses and grades, as shown in the Basic Property Table (Table POM).TABLE POM Polyoxymethylene Materials, Detail Requirements (Natural and Black Color Only)A,B,CGroup Description Class Description Grade DescriptionFlowRateISO113
23、3,D, EG/10 minMeltingPoint,ISO11357-3FC, minDensity,ISO 1183,g/cm3TensileStrength,ISO527,GMPa,minTensileModulus,ISO527HMPa,minCharpyImpactResistance,ISO 179I /1eA, kJ/m2,minDeflectionTemperature,ISO 75/Method AfJ1.82 MPa,C, min01 Homopolymer 1 general purposeandhigh flow1 4 215 90 300 100Homopolymer
24、, impactmodified, MFR 4 205 90 200 100Copolymer impactmodified 205 80 200 100Copolymer, MFR 4 205 90 140 100Copolymer, high modulus,MFR 4 210 100 140 100D6778 14714. Keywords14.1 acetal; acetal copolymer; acetal homopolymer; acetal terpolymer; classification; classification system; line callout;L-P-
25、392A; MIL-P-46137A (MR); plastic materials; polyformaldehyde; polyoxymethylene; polyoxymethylene copolymer;polyoxymethylene homopolymer; polyoxymethylene terpolymer; POM; recycle; specificationAPPENDIX(Nonmandatory Information)X1. CROSS-REFERENCES TO MIL-P-46137A (MR) AND L-P-392AASTM D6778 MIL-P-46
26、137A (MR)POM 111 G20A35070 Type I Class 20POM 111 G30A45080 Type I Class 30POM 111 G40A46080 Type I Class 40POM 21 G25 Type II Grade A Class 25POM 21 G20 Type II Grade B Class 20POM 213 G30A47080 Type II Grade B Class 30POM 213 G40A48080 Type II Grade B Class 40ASTM D6778 L-P-392APOM 111 Type II Cla
27、ss 1POM 112/POM 113 Type I Class 1POM 112/POM 113A Type I Class 2POM 132 Type I Class 3POM 211/POM 311 Type II Class 1POM 213/POM 214 Type I Class 1POM 213/ POM 214A Type I Class 2POM 221 Type I Class 3POM 223 Type I Class 3A Shall be black in color.SUMMARY OF CHANGESCommittee D20D20 has identified
28、the location of selected changes to this standard since the last issue,D6778 - 06D6778 - 12, that may impact the use of this standard. (AugustMay 1, 2012) 1, 2014)(1) Completed five year review of standard.Updated ISO reference for test specimens from ISO 3167 Type 1A to the new ISO20753 Type A1 spe
29、cimens.(2) Aligned format with GuideEditorially corrected references to D5740.Table 1a to 1A, to align formatting in standard.(3) Broadened the MFR ranges for POM0233 and POM0234.(4) Added Table 1a.(5) Removed persuasive language.(6) Editorial changes.ASTM International takes no position respecting
30、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 their own responsibility.This standard
31、 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 H
32、eadquarters. 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.This
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