ASTM D1709-16

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it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D1709 − 15a D1709 − 16
Standard Test Methods for
Impact Resistance of Plastic Film by the Free-Falling Dart
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Method
This standard is issued under the fixed designation D1709; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript 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 of the energy that causes plastic film to fail under specified conditions of impact
of a free-falling dart. This energy is expressed in terms of the weight (mass) of the missile falling from a specified height which
would result in 50 % failure of specimens tested.
1.2 Two test methods are described:
1.2.1 Test Method A employs a dart with a 38.10 6 0.13-mm (1.500 6 0.005-in.) diameter hemispherical head 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 resistances require masses of about
50 g or less to about 6 kg to fracture them.
1.2.2 Test Method B employs a dart with a 50.80 6 0.13-mm (2.000 6 0.005-in.) diameter hemispherical head 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 to about 6 kg.
1.3 Two testing techniques are described:
1.3.1 The standard technique is the staircase method. By this technique, the missile weight employed during the test is decreased
or increased by uniform increments after the testing of each specimen, depending upon the result (fail or not fail) observed for the
specimen.
1.3.2 The alternative technique provides for testing specimens in successive groups of ten. One missile weight is employed for
each group and the missile weight is varied in uniform increments from group to group.
1.3.3 The staircase technique and the alternative technique give equivalent results both as to the values of impact failure weight
which are obtained and as to the precisions with which they are determined.
1.4 The values stated in SI units are to be regarded as standard. The values stated in parentheses are for information only.
NOTE 1—Tests on materials that do not break, for any reason, are not considered to be valid. It has been noted that certain materials may stretch so
far as to bottom out at the base of certain test instruments without actually rupturing. Subcommittee D20.19 is currently considering methods for testing
these materials. Anyone interested in participating in a Task Group should contact the Chairman of Subcommittee D20.19 through ASTM International
Headquarters.
1.5 This standard does not purport to address the safety concerns, if any, associated with its use. It is the responsibility of the
user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations
prior to use.
NOTE 2—Film has been arbitrarily defined as sheeting having nominal thickness not greater than 0.25 mm (0.010 in.).
NOTE 3—This test method is technically equivalent to ISO 7765-1: 1988, with the exception of a larger tolerance on the drop height in Test Method
B, smaller tolerances on the dart diameters for Test Methods A and B, and the requirement for a vented dart well in 5.1.1. Also, the ISO method does
not allow the alternative testing technique described in Section 11 of this test method.
2. Referenced Documents
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2.1 ASTM Standards:
D618 Practice for Conditioning Plastics for Testing
D883 Terminology Relating to Plastics
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These test methods are under the jurisdiction of ASTM Committee D20 on Plastics and are the direct responsibility of Subcommittee D20.19 on Film, Sheeting, and
Molded Products.
Current edition approved May 15, 2015April 15, 2016. Published June 2015April 2016. Originally approved in 1959. Last previous edition approved in 2015 as
D1709 – 15.D1709 – 15a. DOI: 10.1520/D1709-15A.10.1520/D1709-16.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
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