ASTM D2270-10(2016)
Standard Practice for Calculating Viscosity Index from Kinematic Viscosity at 40&x2009;&xb0;C and 100&x2009;&xb0;C

Standard No.

ASTM D2270-10(2016)

Release Date

2010

Published By

American Society for Testing and Materials (ASTM)

Latest

ASTM D2270-10(2016)

Scope

4.1 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 408201;°C and 1008201;°C.

4.2 A higher viscosity index indicates a smaller decrease in kinematic viscosity with increasing temperature of the lubricant.

4.3 The viscosity index is used in practice as a single number indicating temperature dependence of kinematic viscosity.

4.4 Viscosity Index is sometimes used to characterize base oils for purposes of establishing engine testing requirements for engine oil performance categories.6

1.1 This practice2 covers the procedures for calculating the viscosity index of petroleum products, such as lubricating oils, and related materials from their kinematic viscosities at 408201;°C and 1008201;°C.

Note 1: The results obtained from the calculation of VI from kinematic viscosities determined at 408201;°C and 1008201;°C are virtually the same as those obtained from the former VI system using kinematic viscosities determined at 37.788201;°C and 98.898201;°C.

1.2 This practice does not apply to petroleum products with kinematic viscosities less than 2.0 mm²/s at 1008201;°C. Table8201;1 given in this practice applies to petroleum products with kinematic viscosities between 28201;mm²/s and 708201;mm²/s at 1008201;°C. Equations are provided for calculating viscosity index for petroleum products having kinematic viscosities above 708201;mm²/s at 1008201;°C.

1.2.1 In cases where kinematic viscosity data are not available at temperatures of 408201;°C and 1008201;°C, an estimate may be made of the viscosity index by calculating the kinematic viscosity at temperatures of 408201;°C and 1008201;°C from data obtained at other temperatures. Such viscosity index data may be considered as suitable for information only and not for specification purposes. See Test Method D341, Annex A1.

1.3 The kinematic viscosity values are determined with reference to a value of 1.00348201;mm²/s at 20.008201;°C for distilled water. The determination of the kinematic viscosity of a petroleum product shall be carried out in accordance with Test Methods D445, D7042, IP 71, or ISO 3104.

1.3.1 If Viscosity Index calculated for a given sample using kinematic viscosity measurements from different test methods are in disagreement, the values calculated fr......

ASTM D2270-10(2016) Referenced Document

• ASTM D1695 Standard Terminology of Cellulose and Cellulose Derivatives
• ASTM D341 Standard Test Method for Viscosity-Temperature Charts for Liquid Petroleum Products
• ASTM D445 Standard Test Method for Kinematic Viscosity of Transparent and Opaque Liquids (the Calculation of Dynamic Viscosity)
• ASTM D7042 Standard Test Method for Dynamic Viscosity and Density of Liquids by Stabinger Viscometer (and the Calculation of Kinematic Viscosity)
• ASTM E29 Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
• ISO 3104 Petroleum products — Transparent and opaque liquids — Determination of kinematic viscosity and calculation of dynamic viscosity

ASTM D2270-10(2016) history

• 2010 ASTM D2270-10(2016) Standard Practice for Calculating Viscosity Index from Kinematic Viscosity at 40&x2009;&xb0;C and 100&x2009;&xb0;C
• 2010 ASTM D2270-10e1 Standard Practice for Calculating Viscosity Index From Kinematic Viscosity at 40 and 100&176C
• 2010 ASTM D2270-10 Standard Practice for Calculating Viscosity Index From Kinematic Viscosity at 40 and 100&176C
• 2004 ASTM D2270-04 Standard Practice for Calculating Viscosity Index From Kinematic Viscosity at 40 and 100176C
• 1993 ASTM D2270-93(1998) Standard Practice for Calculating Viscosity Index From Kinematic Viscosity at 40 and 100176C