90.93 Standard confirmed Mar 6, 2023
ISO
ISO/TC 256 Pigments, dyestuffs and extenders
International Standard
87.060.10 Pigments and extenders
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.
PUBLISHED
ISO 787-23:1979
90.93
Standard confirmed
Mar 6, 2023