ASTM D2270

Standard Practice for Calculating Viscosity Index from Kinematic Viscosity at 40 °C and 100 °C

Applicability: ASTM D2270 is a standard practice for calculating the viscosity index (VI) of petroleum-based and synthetic lubricating oils. It provides a method to quantify how a lubricant’s viscosity changes with temperature, a crucial factor for ensuring optimal performance in various operating conditions. The standard uses kinematic viscosity measurements at 40°C and 100°C to determine the VI, with a higher VI indicating a smaller change in viscosity over temperature.

Purpose: ASTM D2270 is used to determine the viscosity index of lubricating oils, which is a measure of how much the lubricant’s viscosity changes with temperature.