IP 543: Determination of the viscosity and calculation of kinematic viscosity - Automatic capillary tube method

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  • Method adopted/last revised: 2010
  • Method reapproved: None
  • REF/ISBN: IP543-2936450
  • Status: Current
  • First printed in STM books: January 2010


This standard describes a method for the determination of the viscosity of distillate fuels, residual fuels, and used oils as well as other petroleum products using a computer controlled automatic capillary viscometer.

The kinematic viscosity is calculated from the dynamic viscosity by dividing by the density at the test temperature. The density is either determined at the same time as the dynamic viscosity automatically or by a standard test method.

The automatic capillary viscometer is suitable for determining viscosity in the temperature range 20 °C to 100 °C. Viscosity index is calculated from the kinematic viscosity values at 40 °C and 100 °C.

NOTE - It has been shown that there is a correlation between viscosities determined by this method and IP 71, see Annex B.

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