SUS
(Saybolt Universal Seconds)

is the efflux time in Saybolt Universal Seconds (SUS) required for 60 milliliters of a petroleum product to flow through the calibrated orifice of a Saybolt Universal viscometer, under carefully controlled temperature, as prescribed by test method ASTM-D-88. This method has largely been supplanted by the kinematic viscosity method.

Also see viscosity.

Other methods include Engler viscosity, Kinematic viscosity, Redwood viscosity, and Saybolt Furol viscosity.

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