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

We perform fuel and lubricants quality testing by ASTM D2270 to calculate a petroleum product’s viscosity index from the product’s kinematic viscosity. The viscosity index is a widely used and accepted measure of the variation in kinematic viscosity due to changes in the temperature of a petroleum product between 40 and 100°C. A higher viscosity index indicates a smaller decrease in kinematic viscosity with increasing temperature of the lubricant. The viscosity index is used in practice as a single number indicating temperature dependence of kinematic viscosity. Viscosity Index is sometimes used to characterize base oils for purposes of establishing engine testing requirements for engine oil performance categories. ASTM D2270 covers the procedures for calculating the viscosity index of petroleum products, such as lubricating oils, and related materials from their kinematic viscosities at 40 and 100°C. This calculation requires ASTM D445 – Kinematic Viscosity.

We also perform viscosity testing by ASTM D1092ASTM D2161ASTM D2422ASTM D2532ASTM D2983ASTM D341ASTM D445IP 226IP 71ISO 2909, and ISO 3104. These different test methods use different instruments or procedures or are used for certain sample types. Click on the test method number to learn more about each test.

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Sample quantity required: 250 ml

ASTM D2270 corresponds to ISO 2909 and IP 226.

For additional information on this test method or to purchase a copy of the method, please click HERE to open a new window and visit the ASTM website. Learn more about our laboratory’s certifications and quality program here.