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ASTM D 2270 Document Information:
Title
Standard Practice for Calculating Viscosity Index from Kinematic Viscosity at 40 and 100°C
ASTM International
Publication Date:
Nov 1, 2004
Scope:
This practice(Footnote 2) 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.
NOTE 1 - The results obtained from the calculation of VI from
kinematic viscosities determined at
40 and 100°C are virtually the same as those obtained from the
former VI system using kinematic
viscosities determined at 37.78 and 98.89°C.
Procedure A - For petroleum products of viscosity index up to and
including 100.
Procedure B - For petroleum products of which the viscosity index is
100 or greater.
This standard does not apply to petroleum products with kinematic
viscosities less than 2.0 mm2/s
(cSt) at 100°C. Table 1 given in this practice applies to
petroleum products with kinematic
viscosities between 2 and 70 mm2/s (cSt) at 100°C. Equations are
provided for calculating
viscosity index for petroleum products having kinematic viscosities
above 70 mm2/s (cSt) at
100°C.
NOTE 2 - 1 cSt = 1 mm2/s = 10−6m/s.
In cases where kinematic viscosity data are not available at
temperatures of 40 and 100°C, an
estimate may be made of the viscosity index by calculating the
kinematic viscosity at temperatures
of 40 and 100°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 D
341, Annex A1.
The kinematic viscosity values are determined with reference to a
value of 1.0034 mm2/s (cSt) at
20.00°C 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.
The values stated in SI units are to be regarded as the standard.
Footnote 2 - Supporting data (Metrication of Viscosity Index System
Method D 2270) have been filed
at ASTM International Headquarters and may be obtained by requesting
Research Report RR: D02-1009.
Keywords:
- kinematic viscosity
- viscosity index
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