ASTM D1709 test for plastic film impact resistance and free falling drop dart 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 for ASTM D1709 are described, ASTM D1709 test method A employs a dart with a 38.10 plus or minus 0.13 mm (1.500 plus or minus 0.005 in.) diameter hemispherical head dropped from a height of 0.66 plus or minus 0.01 m (26.0 plus or minus 0.4 in.).
The ASTM D1709 method may be used for films whose impact resistances require masses of about 50 g or less to about 2 kg to fracture them. ASTM D1709 test method B employs a dart with a 50.80 plus or minus 0.13 mm (2.000 plus or minus 0.005 in.) diameter hemispherical head dropped from a height of 1.50 plus or minus 0.03 m (60.0 plus 0.25, minus 1.70 in.). ASTM D1709 specifies a range of applicability from about 0.3 kg to about 2 kg. Two ASTM D1709 testing techniques are described. The standard ASTM D1709 technique is the staircase method. By this ASTM D1709 technique, a uniform missile weight increment is employed during the ASTM D1709 test and the missile weight is decreased or increased by the uniform increment after the ASTM D1709 test of each specimen, depending upon the result (fail or not fail) observed for the specimen. The alternative technique to the ASTM D1709 test method 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 in the ASTM D1709 test method and the alternative technique in the ASTM D1709 test method give equivalent results.
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