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Table IV. Values for Calculating Viscosity Index from Saybolt Universal Viscosity
1957This table gives the values of L and D for calculating Viscosity Index from Saybolt Universal viscosities in the range of 40.0 to 350 sec. The values given are based upon Table II of the Standard Method for Calculating Viscosity Index (ASTM Designation: D 567), and are for substitution in Eq 2 of Method D 567.
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Table III. Basic Values for Calculating Viscosity Index from Kinematic Viscosity
1957Table III gives the basic values of L and D for calculating Viscosity Index from kinematic viscosities in the range of 2.000 to 75.0 cs at 210 F. The values given in Table III are based upon those in Table I of the Standard Method for Calculating Viscosity Index (ASTM Designation: D 567), and are for substitution in Eq 2 of Method D 567.
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Laboratory shearing tests for viscosity index improvers
Tribotest, 1996AbstractThe relative resistance of VI improvers to breakdown depends on internal structural parameters (chemical type, ratio of monomers, degree of branching) as well as on external factors (test type, duration, severity).Of the many bench tests available to screen shear stability, the 30 cycle CEC injector test is most commonly used for engine oils ...
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Mechanism of action of viscosity index improvers
Tribology International, 1978Abstract One reason for using polymeric additives is to obtain a product which has better viscosity-temperature characteristics than a comparable pure mineral oil. Measurements of the viscosity-temperature behaviour of motor oils with and without polymer addition show the necessity of a revision of the generally accepted concept of the mechanism of ...
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An Improved Method for Calculating Viscosity Index (VI) of Low Viscosity Base Oils
Journal of Testing and Evaluation, 2017Abstract The phenomenon of “VI droop” has been observed for many years for low viscosity oils within a given family of base oils. Whereas base oils with 100°C kinematic viscosity greater than 4 mm2/s (cSt) easily conform to the nominal API base oil group of its family, 2 and 3 mm2/s products often do not.
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