ASTM D2171 Test Method for Viscosity of Asphalts by Vacuum Capillary Viscometer
4. Summary of Test Method
4.1 The time is measured for a fixed volume of the liquid to be drawn up through a capillary tube by means of vacuum, under closely controlled conditions of vacuum and temperature. The viscosity in Pascal-seconds is calculated by multiplying the flow time in seconds by the viscometer calibration factor.
NOTE 2 - The rate of shear decreases as the liquid moves up the tube, or it can also be varied by the use of different vacuum or different size viscometer. Thus, this method is suitable for the measurement of viscosities of Newtonian (simple) and non-Newtonian (complex) liquids.
5. Significance and Use
5.1 The viscosity at 60°C (140°F) characterizes flow behavior and may be used for specification requirements for cutbacks and asphalt cements.
