ISO 787-23:1979 Preview

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.


General information

  • Current status : Published
    Publication date : 1979-12
  • Edition : 1
    Number of pages : 2
  • :
    ISO/TC 256
    Pigments, dyestuffs and extenders
  • 87.060.10
    Pigments and extenders

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