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ASTM D 1709 Document Information:
Title
Standard Test Methods for Impact Resistance of Plastic Film by the Free-Falling Dart Method
ASTM International
Publication Date:
Oct 1, 2004
Scope:
(Footnote *)
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.
Two test methods are described:
Test Method A employs a dart with a 38.10 ± 0.13-mm [1.500
± 0.005-in.] diameter
hemispherical head dropped from a height of 0.66 ± 0.01 m [26.0
± 0.4 in.]. This test
method may be used for films whose impact resistances require masses
of about 50 g or less to about
2 kg to fracture them.
Test Method B employs a dart with a 50.80 ± 0.13-mm [2.000
± 0.005-in.] diameter
hemispherical head dropped from a height of 1.50 ± 0.03 m [60.0
+ 0.25, −1.70 in.].
Its range of applicability is from about 0.3 kg to about 2 kg.
Two testing techniques are described:
The standard technique is the staircase method. By this technique, a
uniform missile weight
increment is employed during test and the missile weight is decreased
or increased by the uniform
increment after test of each specimen, depending upon the result (fail
or not fail) observed for
the specimen.
The alternative technique provides for testing specimens in successive
groups of ten. One missile
weight is employed for each group and missile weight is varied in
uniform increments from group to
group.
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.
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.
NOTE 2 - 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. Also, the ISO
method does not allow the
alternative testing technique described in Section 11 of this test
method.
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.
Footnote * - A Summary of Changes section appears at the end of this
standard.
Keywords:
- drop dart
- impact
- plastic film
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