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# ASTM International - ASTM D2270-04

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

inactive
 Organization: ASTM International Publication Date: 1 November 2004 Status: inactive Page Count: 6 ICS Code (Petroleum products in general): 75.080
##### significance And Use:

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... View More

##### scope:

1.1 This practice 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 100oC.

Note 1 -- The results obtained from the calculation of VI from kinematic viscosities determined at 40 and 100oC are virtually the same as those obtained from the former VI system using kinematic viscosities determined at 37.78 and 98.89oC.

1.1.1 Procedure A - For petroleum products of viscosity index up to and including 100.

1.1.2 Procedure B - For petroleum products of which the viscosity index is 100 or greater.

1.2 This standard does not apply to petroleum products with kinematic viscosities less than 2.0 mm2/s (cSt) at 100oC. Table 1 given in this practice applies to petroleum products with kinematic viscosities between 2 and 70 mm2/s (cSt) at 100oC. Equations are provided for calculating viscosity index for petroleum products having kinematic viscosities above 70 mm2/s (cSt) at 100oC.

Note 2 - 1 cSt = 1 mm2/s = 106m2/s.

1.2.1 In cases where kinematic viscosity data are not available at temperatures of 40 and 100oC, an estimate may be made of the viscosity index by calculating the kinematic viscosity at temperatures of 40 and 100oC 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 D 341, Annex A1.

1.3 The kinematic viscosity values are determined with reference to a value of 1.0034 mm2/s (cSt) at 20.00oC for distilled water. The determination of the kinematic viscosity of a petroleum product shall be carried out in accordance with Test Methods D 445, IP 71, ISO 3104, or ISO 2909.

1.4 The values stated in SI units are to be regarded as the standard.

### Document History

January 1, 2016
Standard Practice for Calculating Viscosity Index from Kinematic Viscosity at 40 °C and 100 °C
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 40 °C and...
October 1, 2010
Standard Practice for Calculating Viscosity Index From Kinematic Viscosity at 40 and 100°C
1.1 This practice 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....
October 1, 2010
Standard Practice for Calculating Viscosity Index From Kinematic Viscosity at 40 and 100°C
1.1 This practice 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....
ASTM D2270-04
November 1, 2004
Standard Practice for Calculating Viscosity Index From Kinematic Viscosity at 40 and 100°C
1.1 This practice 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...
April 10, 1998
Standard Practice for Calculating Viscosity Index From Kinematic Viscosity at 40 and 100°C
1.1 This practice specifies 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....