ASTM D1709 PDF

More D Data obtained by one test method cannot be compared directly with the other test method nor with those obtained from tests employing different conditions of missile velocity, impinging surface diameter, effective specimen diameter, material construction and finish of the dart head, and film thickness. The values obtained by these test variables are highly dependent on the method of film fabrication. The confidence limits of data obtained by this procedure can, therefore, vary significantly, depending on the sample quality, uniformity of film gage, die marks, contaminants, etc.

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This test uses a single dart configuration and a single drop height, while varying the weight of the dart. Test results can be used either as a quality control evaluation or for end use comparisons. Test Procedure: Depending upon the expected impact strength of the test sample, either Method A or Method B is chosen. The method defines the dart size and the drop height for the dart. A number of test samples are then impacted to determine an appropriate starting point for the weight of the dart.

The test specimen is clamped securely in a pneumatic ring at the base of the drop tower. The mounting bracket is adjusted to the appropriate drop height, and the dart is inserted into the bracket. The dart is released to drop onto the center of the test specimen. The method to analyze this test data is called the "Bruceton Staircase" method.

A series of 20 to 25 impacts are conducted. If a test specimen passes, the drop weight is increased by one unit. If a test specimen fails, the drop weight is decreased by one unit. Test method A specifies a dart with a 38 mm 1.

Standards can be obtained from appropriate standards authorities.

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Drop Dart ASTM D1709, ISO 7765

More D Scope 1. 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. Its range of applicability is from about 0.

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ASTM D1709

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