ASTM D88 Saybolt Viscosity
Viscosity is a measure of a fluid’s resistance to flow (see ASTM D445). This method measures kinematic viscosity using a Saybolt Universal Viscometer or a Saybolt Furol Viscometer.
A Saybolt Viscometer is a wide metallic cylindrical container with a standard orifice in the bottom. The sample is placed in the viscometer and brought to the test temperature. The orifice is opened and the time it takes for the sample to exit is determined and reported as Saybolt Universal Seconds. For more viscous samples, a Saybolt Furol Viscometer is used and the viscosity is reported in Saybolt Furol Seconds.