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Viscosity Test

ASTM method - D445

Viscosity Test

Measure of a lubricant’s resistance to flow at a specific temperature.

Operating Principle

Measured using a viscometer. The sample is introduced into a “U” shaped calibrated glass tube which is submerged in a constant temperature bath. The oil is warmed to a desired temperature of 40 degrees C or 100 degrees C and allowed to flow via gravity down the tube and up the other side. The number of seconds the oil takes to flow through the calibrated region is measured. The viscosity in centistokes (cSt) is the flow time (seconds) multiplied by the tube factor.

Significance

Viscosity is measured at 40 degrees C for industrial applications and 100 degrees C for engine oil applications. Viscosity for industrial lubricants is classified using the ISOVG (International Standard Organization Viscosity Grade) system which is the average viscosity (cSt) at 40 degrees C. Viscosity for engine oils is classified according to SAE (Society of Automotive Engineers). Viscosity is the most important physical property of oil. Viscosity determination provides a specific number to compare to the recommended oil in service. An abnormal viscosity (+- 15 %) is usually indicative of a problem.

Applications

All industrial lubricants.


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