Apparent Density of Rigid Cellular Plastics ASTM D1622-20

Apparent Density of Rigid Cellular Plastics ASTM D1622-20

ASTM D1622-20 test method determines the properties of cellular materials by providing measures of their apparent overall density (skins formed in the manufacturing process are included) and apparent core density (skins formed in the manufacturing process are removed). This method is mainly for expanded plastics. The final results of this test method are expressed in SI units.

    Scope:

    ASTM D1622-20 test method determines the density of cellular plastics with or without forming skins. It can also be used for spray foam materials. It provides data for research and aids in development and quality control, along with specifying the applications of these materials. In this way, this test method defines the standard for preparing and testing rigid cellular materials, especially plastics. 

    Procedure:

    The analytical balance, micrometer dial gauge, and dual component spray equipment are set up. The specimen is weighed on a balance. Its dimensions are determined with the help of a gauge then it is placed between the jaws of a caliper or a gauge, and the screw is rotated until the specimen surface is touching the measuring faces of the gauge. The measurements are taken in three procedures to avoid an error.

    Specimen size:

    The specimen size and number should be as required.  Three specimens are taken with their shapes so that their volume can be accurately calculated and is not less than 16.4 cm³ (1.0 in.³) in volume.

    Data:

    Density is calculated up to three significant figures as D = Wₛ/V, where D = density of specimen, Wₛ = weight of the specimen, kg (lb), and V = volume of the specimen.

    The estimated standard deviation is reported up to two significant figures. It can be determined using the formula wheres = estimated standard deviation, X = value of a single observation, n = number of observations, and x̄ = arithmetic mean of the set of observations.

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