Bl This standard establishes the calculation of the viscosity index of petroleum products used as lubricants, knowing their viscosity at 37.8°C and 98.9°C, using tables and equations included in the standard. B-2 This method includes tables for lubricant products whose viscosity at 98.9°C is between 2.0 and 75.0cs and also includes the equations to calculate the values in products whose viscosity, at 98.9°C, is less than 2.0cs or is greater, at 98.9°C, than 350s Saybolt Universal. B-3 The kinematic viscosity values are calculated taking the value of l.0038cs as the kinematic viscosity, at 20°C, of distilled water.
IRAM 6565-1955 history
1955IRAM 6565-1955 How to calculate viscosity index in petroleum products