The standard method ASTM D1505 determines the density of plastic material. This test method involves measuring the level to which a test specimen sinks in a liquid column exhibiting a density gradient. The values expressed in SI units should be considered the standard.
Scope:
The standard test method, Density of Plastics by the Density-Gradient Technique ASTM D1505, determines the density of plastic materials. This test procedure is intended to produce findings that are accurate to within 0.05 percent. The density of a solid is a readily quantifiable attribute that is widely used to track physical changes in a sample, as a measure of sample uniformity, and as a means of identification.
Test Procedure:
ASTM D1505 wet specimens are placed in tubes and are required to reach equilibrium. Then thin films are required to settle, and the height of specimens is measured by cathetometer; after that, the samples are removed by means of a clock motor. The procedure should be performed at a low rate so that density remains undisturbed.
Specimen size
Specimen thicknesses should range from 0.025 to 0.051 mm (0.001 to 0.002 in.).
Data:
Density at x = a +[(x – y)(b – a)/(z – y)]
where:
a and b = densities of the two standard floats,
y and z = distances of the two standard
x = distance of unknown above the same arbitrary
level.
Result
The average density of three representative test specimens is reported as D23C, in grams per cubic centimeter.
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