ISO 2909:2002

Petroleum products — Calculation of viscosity index from kinematic viscosity

Publication date: Dec 12, 2002

General information

Current stage: 90.92 Effective date: Jun 22, 2026

Originator: ISO

Owner: ISO/TC 28

Type: International Standard

ICS: 75.080

Languages: English French

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Status: Published

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Scope

ISO 2909:2002 describes two procedures for calculating the viscosity index (VI) of petroleum products and related materials, such as lubricating oils, from their kinematic viscosities at 40 °C and 100 °C.
Procedure A is applicable to petroleum products of viscosity index up to and including 100.
Procedure B is applicable to petroleum products of viscosity index 100 or greater.
ISO 2909:2002 does not apply to petroleum products with kinematic viscosities less than 2,0 mm2/s at 100 °C. It applies to petroleum products with kinematic viscosities between 2 mm2/s and 70 mm2/s at 100 °C. Equations are provided for calculating the viscosity index of petroleum products having kinematic viscosities above 70 mm2/s at 100 °C.