NF EN ISO 18335, M07-174 (02/2024)

This document specifies a procedure for determining the dynamic viscosity, ?, and density, ?, for the calculation of the kinematic viscosity, ?, of middle distillates, fatty acid methyl esters (FAME) and their mixtures, up to 60% with middle distillates, as well as lubricating oils (e.g. base oils, formulated oils) and synthetic oils, using a constant pressure viscometer. The kinematic viscosity range covered by this test method is 0.5 mm2/s to 2000 mm2/s, with a precision at 40°C of 1.0 mm2/s to 1286 mm2/s , and a fidelity at 100°C of 3.0 mm2/s to 157 mm2/s. The result obtained using the procedure described in this document depends on the rheological behavior of the sample. This document mainly applies to liquids whose shear stress and shear rate are proportional (Newtonian flow behavior). However, if viscosity varies significantly with shear rate, comparison with other measurement methods is only possible at similar shear rates.
(Automatic translation from French)