1、Designation:D179021Standard Test Method forBrittleness Temperature of Plastic Sheeting by Impact1This standard is issued under the fixed designation D1790;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A nu
2、mber 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*1.1 This test method covers the determination of thattemper
3、ature at which plastic sheeting 1.00 mm(0.040 in.)orless in thickness exhibits a brittle failure under specified impactconditions.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.NOTE1This test method was developed jointly wi
4、th the Society of thePlastics Industry,primarily for use with plasticized vinyl sheetings.Itsapplicability to other plastic sheetings must be verified by the user.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the use
5、r of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.NOTE2This test method and ISO 8570 address the same subjectmatter,but differ in technical content.1.4 This international standard was develop
6、ed 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
7、.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD883 Terminology Relating to PlasticsD5947 Test Methods for Physical Dimensions of SolidPlastics SpecimensD6988 Guide for Determination of Thickness of Plastic FilmTest SpecimensE456 Terminology Relating to Quality and StatisticsE
8、691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodE2935 Practice for Conducting Equivalence Tests for Com-paring Testing Processes2.2 ISO Standard:ISO 8570 PlasticsFilm and SheetingDetermination ofCold-Crack Temperature33.Terminology3.1 Definitions:3.1.1
9、brittleness temperature,Tbthat temperature,derivedstatistically,where 80%of the specimens would probably pass95%of the time when a stated minimum number are tested bythis test method.The 80%-passing value is determined byplotting the data on probability graph paper,as described in9.1.3.1.2 GeneralTe
10、rms used in this standard are defined inaccordance with Terminology D883,unless otherwise speci-fied.For terms relating to precision and bias and associatedissues,the terms used in this standard are defined in accordancewith Terminology E456.4.Significance and Use4.1 Data obtained by this test metho
11、d have been used topredict the behavior of plastic sheeting at low temperaturesonly if the conditions of deformation are similar to thosespecified in this test method.This test method is useful forspecification testing and for comparative purposes,but doesnot necessarily determine the lowest use tem
12、perature for aparticular plastic.4.2 It has been demonstrated that on calendared sheeting thebrittleness temperature is sensitive to the direction of fold.Ithas also been demonstrated that the brittleness temperature issensitive to the direction of sampling.Therefore,it is impera-tive that the proce
13、dure for taking specimens and folding befollowed explicitly.1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsand is the direct responsibility of Subcommittee D20.30 on Thermal Properties.Current edition approved Jan.15,2021.Published February 2021.Originallyapproved in 19
14、60.Last previous edition approved in 2014 as D1790-14.DOI:10.1520/D1790-21.2For 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
15、 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.United Sta
16、tesThis 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.15.Apparatus5.1 Cold Conditioning Chamber,at least 450 by 450 by 450mm(18 by 18 by 18 in.).Means(automatic or manual)shall beprovided for controlling the temperature of the chamber to
