![]() ![]() Procedure: Insert a cork in the bottom of the viscometer cup and fill the cup to the prepared sample to such a height that the leading plug on the value is just immersed when the taller is vertical. A low viscosity index signifies a relatively large change in viscosity with temperature and vice versa.Īpparatus: Viscometer consisting essentially of a cup with an orifice in the centre of the base, which may be closed by a ball and socket value, water bath, thermometer, recover time recorder etc. ![]() Scope: The tables and equations included in the method provide a means for calculations of the viscosity index of the petroleum product from its viscosity at 40 oC and 100 oC, This method provides tables of oils with viscosities at 100 oC between the values of 2 and 70 Centistokes(mm 2/ sec) equations are provided for calculating basic values for oils having viscosities about 70 Centistokes at 100 oC.ĭefinition: A viscosity index is an empirical number indicating the effect of change of temperature and viscosity of an oil. ![]()
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