1、Designation:D170922Standard Test Methods forImpact Resistance of Plastic Film by the Free-Falling DartMethod1This standard is issued under the fixed designation D1709;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last r
2、evision.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.Scope*1.1 These test methods cover the determination
3、of theenergy that causes plastic film to fail under specified conditionsof impact of a free-falling dart.This energy is expressed interms of the weight(mass)of the missile falling from aspecified height which would result in 50%failure of speci-mens tested.1.2 Two test methods are described:1.2.1 Te
4、stMethodAemploysadartwitha38.10 6 0.13-mm(1.500 6 0.005-in.)diameter hemisphericalhead dropped from a height of 0.66 6 0.01 m(26.0 6 0.4 in.).This test method can be used for films whose impact resis-tances require masses of about 50 g to about 6 kg to fracturethem.1.2.2 TestMethodBemploysadartwitha
5、50.80 6 0.13-mm(2.000 6 0.005-in.)diameter hemisphericalhead dropped from a height of 1.52 6 0.03 m(60.0+0.25,1.70 in.).Its range of applicability is from about 0.3 kg toabout 6 kg.1.3 Two testing techniques are described:1.3.1 The standard technique is the staircase method.Bythis technique,the miss
6、ile weight employed during the test isdecreased or increased by uniform increments after the testingof each specimen,depending upon the result(fail or not fail)observed for the specimen.1.3.2 The alternative technique provides for testing speci-mens in successive groups of ten.One missile weight ise
7、mployed for each group and the missile weight is varied inuniform increments from group to group.1.3.3 The staircase technique and the alternative techniquegive equivalent results both as to the values of impact failureweight which are obtained and as to the precisions with whichthey are determined.
8、1.4 The values stated in SI units are to be regarded asstandard.The values stated in parentheses are for informationonly.NOTE1Tests on materials that do not break,for any reason,are notconsidered to be valid.It has been noted that certain materials may stretchso far as to bottom out at the base of c
9、ertain test instruments withoutactually rupturing.Subcommittee D20.19 is currently considering meth-ods for testing these materials.Anyone interested in participating in a TaskGroup should contact the Chairman of Subcommittee D20.19 throughASTM International Headquarters.1.5 This standard does not p
10、urport 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.NOTE2Film has been arbitrarily d
11、efined as sheeting having nominalthickness not greater than 0.25 mm(0.010 in.).NOTE3This test method is technically equivalent to ISO 7765-1:1988,with the exception of a larger tolerance on the drop height in TestMethod B,smaller tolerances on the dart diameters for Test Methods Aand B,and the requi
12、rement for a vented dart well in 5.1.1.Also,the ISOmethod does not allow the alternative testing technique described inSection 11 of this test method.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decisio
13、n 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:2D618 Practice for Conditioning Plastics for TestingD883 Terminology Relating to Plastics
14、D1248 Specification for Polyethylene Plastics ExtrusionMaterials for Wire and CableD3420 Test Method for Pendulum Impact Resistance ofPlastic Film1These test methods are under the jurisdiction of ASTM Committee D20 onPlastics and are the direct responsibility of Subcommittee D20.19 on Film,Sheeting,
15、and Molded Products.Current edition approved July 1,2022.Published July 2022.Originally approvedin 1959.Last previous edition approved in 2016 as D1709 16a1.DOI:10.1520/D1709-22.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For
16、Annual Book of ASTMStandards volume information,refer to the standards 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 an