GSO IEC 61868:2015
IEC 61868:1998
Gulf Standard
Current Edition
·
Approved on
03 September 2015
Mineral insulating oils - Determination of kinematic viscosity at very low temperatures
GSO IEC 61868:2015 Files
English
21 Pages
Current Edition
Reference Language
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GSO IEC 61868:2015 Scope
This International Standard specifies a procedure for the determination of the kinematic viscosity of mineral insulating oils, both transparent and opaque, at very low temperatures, after a cold soaking period of at least 20 h, by measuring the time for a volume of liquid to flow under gravity through a calibrated glass capillary viscometer.
It is applicable at all temperatures to both Newtonian and non-Newtonian liquids having viscosities of up to 20 000 mm2 × s–1. It is particularly suitable for the measurement of the kinematic viscosity of liquids for use in cold climates, at very low temperatures (–40 °C) or at temperatures between the cloud and pour-point temperatures (typically –20 °C) where some liquids may develop unexpectedly high viscosities under cold soak conditions.
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