ASTM D1622 Apparent Density of Rigid Cellular Plastics

Scope:

ASTM D1622 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:

In ASTM D1622 test method, 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. It is then 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 any errors.

Specimen size:

The specimen size and number should be as required by the ASTM D1622 standard. Three specimens are taken such that their volumes can be accurately calculated and is not less than 16.4 cm³ (1.0 in.³) in volume.

Data:

For ASTM D1622, the density is calculated up to three significant figures as follows:

D = Wₛ/V

where,

D = density of the specimen 

Wₛ = weight of the specimen, kg (lb)

V = volume of the specimen

The estimated standard deviation is reported up to two significant figures.

Conclusion:

ASTM D1622 test method determines the density of cellular plastics with or without forming skins.