ASTM_D_4549_-_15_2021.pdf

Designation:D454915(Reapproved 2021)Standard Classification System and Basis for Specification forPolystyrene and Rubber-Modified Polystyrene Molding andExtrusion Materials(PS)1This standard is issued under the fixed designation D4549;the number immediately following the designation indicates the year oforiginal adoption or,in 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.Scope1.1 This classification system covers polystyrene materials,both crystal and rubber modified,suitable for molding andextrusion.1.2 This classification system and subsequent line callout(specification)are intended to be a means of calling out plasticmaterials used in the fabrication of end items or parts.It is notintended for the selection of materials.Material selection canbe made by those having expertise in the plastics field aftercareful consideration of the design and the performancerequired of the part,the environment to which it will beexposed,the fabrication process to be employed,the inherentproperties of the material other than those covered by thisspecification,and the economics.1.3 The properties included in this specification are thoserequired to identify the compositions covered.Other require-ments necessary to identify particular characteristics importantto specialized applications are to be specified using the suffixesas given in Section 5.1.4 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.NOTE1This standard combines elements from ISO 1622-1-2 and ISO2897-1-2,but is not equivalent to either ISO standard.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-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:2D256 Test Methods for Determining the Izod PendulumImpact Resistance of PlasticsD638 Test Method for Tensile Properties of PlasticsD648 Test Method for Deflection Temperature of PlasticsUnder Flexural Load in the Edgewise PositionD790 Test Methods for Flexural Properties of Unreinforcedand Reinforced Plastics and Electrical Insulating Materi-alsD792 Test Methods for Density and Specific Gravity(Rela-tive Density)of Plastics by DisplacementD883 Terminology Relating to PlasticsD1238 Test Method for Melt Flow Rates of Thermoplasticsby Extrusion PlastometerD1525 Test Method for Vicat Softening Temperature ofPlasticsD1600 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 PlasticsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsManual on Presentation of Data and Control ChartAnalysis,8th Edition,Catalog Number:MNL7-8TH-EB2.2 ISO Standards:3ISO 1622-1-2 Polystyrene(PS)Molding and ExtrusionMaterialsPart 1:Designation System and Basis forSpecifications1This specification is under the jurisdiction of ASTM Committee D20 onPlastics and is the direct responsibility of Subcommittee D20.15 on ThermoplasticMaterials.Current edition approved July 1,2021.Published July 2021.Originally approvedin 1985.Last previous edition approved in 2015 as D4549 15.DOI:10.1520/D4549-15R21.2For 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 Summary page onthe ASTM website.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1ISO 1622-2 Polystyrene(PS)Molding and ExtrusionMaterialsPart 2:Preparation of Test Specimens andDetermination of PropertiesISO 2897-1 Impact-Resistant Polystyrene(PS-I)Moldingand Extrusion MaterialsPart 1:Designation System andBasis for SpecificationsISO 2897-2 Impact-Resistant Polystyrene(PS-I)Moldingand Extrusion MaterialsPart 2:Preparation of TestSpecimens and Determination of Properties3.Terminology3.1 DefinitionsThe terminology used in this classificationsystem is in accordance with Terminologies D883 and D1600.4.Classification4.1 Polystyrene ma