![]() The change in viscosity enables conclusions to be drawn on mixture with other oils, impurities such as soot or fuel, VI improver shear or oil thickening due to factors such as oxidation. All laboratory tests for this study were conducted at the Oil and Gas Institute in Kraków the National Research Institute. ![]() ![]() The higher the VI, the lower the temperature-related change in viscosity. The authors thank the Director of the Oil and Gas Institute, Professor Maria Ciechanowska, PhD Eng., and acting as Deputy Director for Oil Technology, Wiesawa Urzdowska, MSc, for the opportunity to perform the tests. The viscosity values at 40 ☌ and 100 ☌ are used to calculate the VI (viscosity index). The time the oil requires to travel a certain measuring distance is converted into kinematic viscosity at 40 ☌ and at 100 ☌ using the capillary constant. The ISL Houillon viscosimeter consists of a 40 ☌ and a 100 ☌ tempering bath, each containing 4 capillar viscosimeters. The viscosity determination is a description of the pouring behaviour of liquids. The time the oil requires to travel a certain measuring distance is converted into kinematic viscosity at 40 C and at 100 C using the capillary constant. Viscosity 40 ☌, viscosity 100 ☌, VI (viscosity index) Mm²/s for viscosity, none for VI (viscosity index) Nametre Viscoliner 1710, dynamic viscosity Viscosimeters for the petrochemical laboratory are suitable for measuring kinematic viscosity according to ASTM D445, mainly lubricants but also fuels such. ISL Houillon Viscometer, kinematic viscosity
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