is the determined by any of several
ASTM test methods. Two common methods are
ASTM-D-2170 and D-2171. The former
method measures kinematic viscosity,
that is, viscosity under the force of gravity,
by allowing a test sample to flow down a capillary tube (viscometer)
at a temperature of 135°C (275°F); the viscosity is expressed in
centistokes. The latter method measures
absolute viscosity. The liquid, at a
temperature of 60°C (140°F), is drawn up a tube by applying a vacuum; the
viscosity is expressed in poises. In both tests
the viscosity is obtained by multiplying the flow time in seconds by the
viscometer calibration factor.
Also see penetration
(asphalt), viscosity.
Application
Notes:
