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RS ISO 3104: 2023
Petroleum products — Transparent and opaque liquids — Determination of kinematic viscosity and calculation of dynamic viscosity

Abstract

This document specifies Procedure A, using manual glass viscometers, and Procedure B, using glass
capillary viscometers in an automated assembly, for the determination of the kinematic viscosity, ?, of
both transparent and opaque products. The scope includes liquid petroleum products, fatty acid methyl
ester (FAME), paraffinic diesel, hydrotreated vegetable oil (HVO), gas to liquid (GTL) and biofuel diesel
mixtures up to 50 % FAME. The kinematic viscosity is determined by measuring the time for a volume
of liquid to flow under gravity through a calibrated glass capillary viscometer. The dynamic viscosity,
?, is obtained by multiplying the measured kinematic viscosity by the density, ?, of the liquid. The range
of kinematic viscosities covered in this test method is from 0,2 mm2/s to 300 000 mm2/s over the
temperature range –20 °C to +150 °C.
NOTE The result obtained from this document is dependent upon the behaviour of the sample and is intended
for application to liquids for which primarily the shear stress and shear rates are proportional (Newtonian flow
behaviour). If, however, the viscosity varies significantly with the rate of shear, different results can be obtained
from viscometers of different capillary diameters. The procedure and precision values for residual fuel oils,
which under some conditions exhibit non-Newtonian behaviour, have been included.

General Information

Code	Classification	Theme	Pages	Publisher	Availability
RS ISO 3104: 2023	ADOPTED ISO STANDARDS	Petroleum and related technologies	33	Forth Edition Jul 2026	Available