When the flow time is in excess of 5600 seconds, Saybolt Furol Seconds should be used instead of Saybolt Universal Second. It is used when the oils have flow time upto 5600 seconds. It is the time required for 60 ml of oil to flow through a calibrated tube at a controlled temperature. The Saybolt Universal Second (S.U.S) is a measure of kinematic viscosity. Furol viscosity is a specific test which is only used for the measurement of liquid bituminous materials. In case of high viscosity it will resist the compactive effort but mixture is heterogenous. At low viscosity the bitumen binder simply lubricates the aggregate particles instead of providing a binder action. The viscosity of liquid bitumen is measured by efflux visconnectors. Viscosity is the inverse of fluidity and it is a measure of resistance of flow. Water Bath- Capable of maintaining the required testing temperature within the specified limit.Filter Funnel- It is equipped with interchangeable 150 μm (no.Viscometer- A Saybolt Furol Viscometer.AASHTO T72, “Standard Method of test for Saybolt Viscosity”, 2005.ASTM D7496-11: Standard test method for viscosity of emulsified asphalt by Saybolt Furol Viscometer.ASTM D88-07: Standard test method for Saybolt viscosity. ![]() To determine the viscosity of bituminous material.
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