Castor oil is a non drying oil with functionality provided by ricinoleic acid (12-hydroxyoleic acid). It has a higher viscosity than other natural oils (6 - 7 poise @ 25ºC compared to 0.5 – 1 poise @ 25ºC) and its viscosity only changes slightly with temperature, making it a good lubricant for fairly heavy machinery which operate at elevated temperatures. It is a technical grade and is usually the grade of choice for general lubricant applications. Seatons pharmaceutical castor oil is the highest quality grade and is sometimes used to lubricate food machinery.
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