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General methods of test for pigments and extenders - Part 23 : Determination of density (using a centrifuge to remove entrained air)
Displacement liquids of known density should be selected in which the material to be tested is insoluble, and which has good wetting properties and a low evaporation rate under vacuum. High-boiling aromatic or aliphatic hydrocarbons are suitable.
The temperature, t, at which the determination is carried out affects the density of the displacement liquid; each weighing should be made at a constant temperature.
The principle consists in weighing into a tared tube a quantity of a dried sample, wetting it with displacement liquid, centrifuging until the occluded air is removed and calculation of the density from the difference of masses.
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