The Viscosity Index Test Defined Per ASTM Standards and Meaning
Viscosity Index (VI) Test The Viscosity Index (VI) Test (ASTM D2270) is based on the kinematic viscosity of the fluid at 104 ° F (40 ° C) and 212 ° F (100 ° C). Fluids whose viscosities do not change much between these two temperatures will have higher viscosity indices than those whose viscosity changes […]
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