The choice of method for determining density is based on the type of material as well as on the size and shape of the sample. A further criterion is the required level of precision. The density is determined on the basis of the calculated volume and the mass of the sample and is given in g/cm3.
Hydrometer method:
This method uses solid samples or samples from moldings. The volume is calculated by dispersing and agitating the solid in distilled water or other suitable liquid. The degree of precision: 3 decimal places.
Air comparison pycnometer:
This method uses powders, porous and irregularly shaped solids. It involves calculating the volume of air displaced by the sample in a measuring cylinder. The degree of precision: 2 decimal places.
Apparent density:
The apparent density of granules, powdered or free-flowing materials is calculated by filling a measuring beaker with a stipulated volume of the sample material and weighing, adhering to the method described in the standard. The apparent density is given in g/cm3.
The apparent density is, among other things, a criterion applied in the processing of injection molding compounds and provides a basis on which to calculate a cavity.
Standards:
DIN EN ISO 1183-1
DIN EN ISO 60
DIN 53479
ASTM D792
or corresponding standards
