1、Designation:D120414(Reapproved 2020)Standard Test Method forLinear Dimensional Changes of Nonrigid ThermoplasticSheeting or Film at Elevated Temperature1This standard is issued under the fixed designation D1204;the number immediately following the designation indicates the year oforiginal adoption o
2、r,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
3、This test method covers the measurement of changes inlinear dimensions of nonrigid thermoplastic sheeting or filmthat result from exposure of the material to specified conditionsof elevated temperature and time.1.2 The values stated in SI units are to be regarded as thestandard.1.3 This standard doe
4、s not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.NOTE1This test method and
5、 ISO 11501 address the same matter,butdiffer in technical content(and results cannot be directly comparedbetween the two methods).1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for
6、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 TestingD883 Terminology Relating to PlasticsD2732 Test Method fo
7、r Unrestrained Linear ThermalShrinkage of Plastic Film and SheetingD4000 Classification System for Specifying Plastic Materi-als2.2 ISO StandardISO 11501 Plastics:Film and SheetingDetermination ofDimensional Change on Heating33.Terminology3.1 DefinitionsTerms applicable to this test method aredefine
8、d in Terminology D883.4.Significance and Use4.1 This test method is particularly applicable to nonrigidthermoplastic sheeting or film made by the calender or extru-sion process.The test gives an indication of lot-to-lot unifor-mity in regards to the degree of internal strains introducedduring proces
9、sing.4.2 The heating medium in this test method is air and doesnot necessarily yield the same results as Test Method D2732,which uses a liquid medium.4.3 Before proceeding with this test method,review thespecifications of the material being tested,if available.Any testspecimen preparation,conditioni
10、ng,dimensions,or testingparameters,or combination thereof,covered in the relevantASTM material specification shall take precedence over thosementioned in this test method.If there are no relevant ASTMmaterial specifications,then the default conditions apply.Table1 of Classification System D4000 list
11、s the ASTM materialstandards that currently exist.5.Apparatus5.1 OvenA mechanical convection oven capable of main-taining a temperature of 100 6 1C.5.2 Scale,graduated in 0.25-mm(0.01-in.)divisions,30 cm(12 in.)or more in length.5.3 Thermometer,graduated in 1C divisions,with a rangesuitable for the
12、test temperature used.5.4 Timer,graduated in minutes.1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsand is the direct responsibility of Subcommittee D20.19 on Film,Sheeting,andMolded Products.Current edition approved April 1,2020.Published April 2020.Originallyapproved
13、in 1952.Last previous edition approved in 2014 as D1204-14.DOI:10.1520/D1204-14R20.2For 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 on
14、the ASTM website.3Available 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.Un
15、ited 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 Barrier
16、s to Trade(TBT)Committee.5.5 Template,25 by 25 cm(10 by 10 in.),for cutting testspecimens.5.6 Heavy Paper Sheets,approximately 40 by 40 cm(15 by15 in.),with smooth,wrinkle-and crease-free surfaces.5.7 Talc,finely ground.6.Test Specimens6.1 The test specimens shall be two pieces of the sheeting orfilm 25 by 25 cm(10 by 10 in.),cut with the aid of thetemplate,one from either of the two transverse edges and onefrom the center of the sheet as shown in Fig.1.Each specimenshall be marked to show the d