1、Designation:D100421Standard Test Method forTear Resistance(Graves Tear)of Plastic Film and Sheeting1This standard is issued under the fixed designation D1004;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A
2、 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*1.1 This test method2covers the determination of the tea
3、rresistance of flexible plastic film and sheeting at very low ratesof loading,51 mm(2 in.)/min.and is designed to measure theforce to initiate tearing.The specimen geometry of this testmethod produces a stress concentration in a small area of thespecimen.The maximum stress,usually found near the ons
4、et oftearing,is recorded as the tear resistance in newtons(orpounds-force).The method is not applicable for film orsheeting material where brittle failures occur during testing orwhere maximum extension is greater than 101.6 mm(4 in.).1.1.1 Although resistance to tear can be expressed in new-tons pe
5、r microns,(pounds-force per mil)of specimenthickness,this is only advisable where correlation for theparticular material being tested has been established.In mostcases,comparison between films of dissimilar thickness is notvalid.NOTE1Film has been arbitrarily defined as sheeting having nominalthickn
6、ess not greater than 0.25 mm(0.010 in.).1.2 Constant-Rate-of-Grip Separation TestThis testmethod employs a constant rate of separation of the gripsholding the test specimen.1.2.1 Specimen extension shall be measured in this testmethod by grip separation.1.3 The values stated in SI units are to be re
7、garded as thestandard.The values given in parentheses are provided forinformation only.1.4 This standard does 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
8、 practices and deter-mine the applicability of regulatory limitations prior to use.NOTE2There is no known ISO equivalent to this standard.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Princip
9、les 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:3D618 Practice for Conditioning Plastics for TestingD882 Test Method for Tensile Properties of Thin P
10、lasticSheetingD883 Terminology Relating to PlasticsD4000 Classification System for Specifying Plastic Materi-alsD5947 Test Methods for Physical Dimensions of SolidPlastics SpecimensD6988 Guide for Determination of Thickness of Plastic FilmTest SpecimensE4 Practices for Force Verification of Testing
11、MachinesE456 Terminology Relating to Quality and StatisticsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodE2935 Practice for Conducting Equivalence Tests for Com-paring Testing Processes3.Terminology3.1 DefinitionsTerms used in this standard are defin
12、ed 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.Summary of Test Method4.1 The force to initiate tearing across a specific geometryof a film
13、 or sheeting specimen is measured using a constant-rate-of-grip separation machine.The force necessary to initiatethe tear is calculated from the load-time or load-displacementdata.1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsand is the direct responsibility of Subcom
14、mittee D20.19 on Film,Sheeting,andMolded Products.Current edition approved Jan.15,2021.Published February 2021.Originallyapproved in 1949.Last previous edition approved in 2013 as D1004 13.DOI:10.1520/D1004-21.2The following reference may be of interest in connection with this test method:Graves,F.L
15、.,“The Evaluation of Tear Resistance in Elastomers,”India RubberWorld,Vol 111,No.3,December 1944,pp.305308.3For 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
16、Document Summary page onthe ASTM website.*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 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 Barr
