![]() If you have the viscosity in centiPoise, divide the centiPoise value by the oil's viscosity to get centiStokes. ASTM D445 Standard Test Method for Kinematic Viscosity of Transparent and Opaque Liquids (and Calculation of Dynamic Viscosity) ASTM D2270 Standard Practice. Standard practice for calculating viscosity index from kinematic viscosity at 40 and. the Viscosity Index (VI) by the formulas specified in ASTM D2270 (Standard Practice for Calculating Viscosity Index from Kinematic Viscosity at 40 and. This calculator uses centiStokes (cSt), which are equivalent to mm^2/s. ASTM D2270 / Viscosity Index (VI) from 40C and 100C - Anton Paar. Higher quality oils tend to have higher viscosity indices, and while there are ranges in every category, a synthetic oil will tend to have a much higher viscosity index than its conventional counterpart. The VI method (outlined in ASTM D2270), established more than 90 years ago, indicates the degree to which an oil’s viscosity changes over a range of temperatures. If you know the viscosity of your oil at 40✬ and 100✬ (100✯ and 212✯) you can easily calculate its Viscosity Index. Viscosity index (VI) is a common method for comparing the temperature-related viscosity changes for various oils. Oil needs to flow when cold, but not get too thin and runny when it's warm. That is, oil with a high VI will retain their viscosity over a wider temperature range and work as designed in both hot and cold environments.Ī higher VI is important when your machine will experience a big change in operating temperatures. VAT) NOK 1 392,50 (with VAT) Scope:This International Standard describes two procedures for calculating the viscosity index (VI). The higher the viscosity index, the lower the change in viscosity. The degree to which the viscosity decreases determines the Viscosity Index (VI). ![]() Calculator for viscosity index (VI) according to ASTM D2270 and ISO 2909. The viscosity of an oil decreases as temperature increases. Standard practice for calculating viscosity index from kinematic viscosity at 40 and 100☌. Viscosity Index and what you need to know
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