ASTM D2270 / Viscosity Index (VI) from Free Temperatures

Standard Practice for Calculating Viscosity Index from Kinematic Viscosity at specific, free temperatures.

Calculator for viscosity index (VI) according to ASTM D2270 and ISO 2909. If values are used other than 40°C and 100°C, ASTM D341 is applied before calculating the viscosity index.

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