Abstract
This paper reports the degree of stability of the viscosity of Chitosan/gelatin mixtures having viscosity from 1 mm 2 /s to 161 mm 2 /s. The kinematic viscosity of the five liquids, was determined at 20 °C and 25 °C. To test the stability of the viscosity of these oils, we have repeated the measurements of the kinematic and dynamic viscosity at 20 °C and 25 °C, several times for a period of two years. The measurements were carried out using standard viscometers and water bath, where temperature stability was about ± 0.02 °C. The variations of the viscosity for the oils under test during two years interval were within the ranges of uncertainty of measurements. The results obtained show that these oils can be used for a period of two years with stable physical and chemical composition and in turn their measured viscosity values. These recommended viscosity standards will be of great importance for many applications e.g., thickeners, food, textile, sizings, petrol and medical industries because they verify a wide calibration ranges of viscosity values for different industries.
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