1、Designation:D 4181 00Standard Classification forAcetal(POM)Molding and Extrusion Materials1This standard is issued under the fixed designation D 4181;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number
2、in parentheses indicates the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1.Scope*1.1 This classification covers acetal materials suitable formolding
3、 and extrusion.This specification allows for the use ofacetal plastic materials that are recycled,reconstituted,recycled-regrind,recovered,or reprocessed,or combinationthereof,provided that the requirements as stated in thisspecification are met.It is the responsibility of the supplier andthe buyer
4、of recycled,reconstituted,recycled-regrind,recov-ered,or reprocessed acetal plastic materials,or combinationthereof,to ensure compliance.(See Guide D 5033).1.2 The properties included in this classification are thoserequired to identify the compositions covered.There may beother requirements necessa
5、ry to identify 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
6、 or parts.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
7、 be 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 classificati
8、on.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 limita-tions prior to use.NOTE1This classificat
9、ion is similar to ISO 9988-1 and 9988-2,although the technical content is significantly different.NOTE2This classification was revised in 1992 to include interna-tional 4-mm specimens and test procedures as the standard for compli-ance.The 3.2-mm specimens,test methods,and Tables POM,A,and Bthat wer
10、e superceded by the revision are included in Appendix X2,as areference for those wishing to use them.It is recommended that thematerial manufacturer be consulted on all callouts against this classifica-tion.2.Referenced Documents2.1 ASTM Standards:D 618 Practice for Conditioning Plastics and Electri
11、calInsulating Materials for Testing2D 792 Test Methods for Specific Gravity(Relative Density)of Plastics by Displacement2D 883 Terminology Relating to Plastics2D 1238 Test Method for Flow Rates of Thermoplastics byExtrusion Plastometer2D 1600 Terminology for Abbreviated Terms Relating toPlastics2D 3
12、418 Test Method for Transition Temperatures of Poly-mers by Thermal Analysis3D 3641 Practice for Injection Molding Test Specimens ofThermoplastic Molding and Extrusion Materials3D 3892 Practice for Packaging/Packing of Plastics3D 4000 Classification System for Specifying Plastic Mate-rials3D 5033 Gu
13、ide for the Development of Standards Relating tothe Proper Use of Recycled Plastics4D 5630 Test Method for Ash Content in Thermoplastics4E 29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications52.2ISO Standards:6ISO 75 Plastics and EboniteDetermination of T
14、empera-ture of Deflection under LoadISO 178 PlasticsDetermination of Flexural Properties ofRigid MaterialsISO 180/1A PlasticsDetermination of Izod ImpactStrength of Rigid Materials1This classification is under the jurisdiction of ASTM Committee D20 onPlastics and is the direct responsibility of Subc
15、ommittee D20.15 on ThermoplasticMaterials(Section D20.15.18).Current edition approved July 10,2000.Published October 2000.Originallypublished as D 4181 83.Last previous edition D 4181 98.2Annual Book of ASTM Standards,Vol 08.01.3Annual Book of ASTM Standards,Vol 08.02.4Annual Book of ASTM Standards,
16、Vol 08.03.5Annual Book of ASTM Standards,Vol 14.02.6Available from American National Standards Institute,11 W.42nd St.,13thFloor,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,United States.ISO 527 PlasticsDetermination of Tensile PropertiesISO 1133 PlasticsDetermination of Melt Flow Rate ofThermoplasticsISO 1183 PlasticsMethods for Determining the Densityand Relat
