Determination of density

Introduction to density measurements

The density of  powders is determined by gas pycnometry. This parameter is a requirement in order determinate the surface area by air permeability (Blaine).

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Instrument and measuring principles

Gas pycnometric density is determined by measuring the volume occupied by a known mass of powder/particles, which is equivalent to the volume of gas displaced by the powder using a gas displacement pycnometer. In gas pycnometric density measurements, the volume determined excludes the volume occupied by open pores; however, it includes the volume occupied by sealed pores or pores inaccessible to the gas. Usually, helium is used as a test gas due to its high diffusivity into small open pores. If gases other than helium are used, different values would be obtained, since the penetration of the gas is dependent on the size of the pore as well as the cross-sectional area of the gas molecules.

Instrument Accupyc 1330 from Micromeritics
Result The volume of gas (helium) displaced by a known mass of substance is measured. The density of particles is expressed in grams per cubic centimetre (g/cm3)
Sample amount 1-5 g – volume preferably 7.5-75 cm³.
Notes Drying conditions have to be determined