The density of Plastics by the Density-Gradient Technique ASTM D1505

The density of Plastics by the Density-Gradient Technique ASTM D1505

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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