scope:

This International Standard specifies two procedures for calculating the viscosity index of petroleum products and related materials from their 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. The table given in this International Standard applies to petroleum products with kinematic viscosities between 2 and 70 mm ² /s at 100 ° C. Equations are provided for calculating viscosity index for petroleum products having kinematic viscosities above 70 mm² /s at 100 ° C. The kinematic viscosity values are determined with reference to a value of 1,003 8 mm² /s at 20,00 ° C for distilled water. The determination of the kinematic viscosity of a petroleum product shall be carried out in accordance with ISO 3104.