White oil is a colorless and translucent oily liquid with no or almost no fluorescence. It is odorless and tasteless when cold. It has a slight petroleum-like smell when heated and is insoluble in water. , ethanol, soluble in volatile oils, miscible in most non-volatile oils, stable to light, heat, acid, etc., but will slowly oxidize if exposed to light and heat for a long time. It is understood that commonly used ones include industrial grade white oil, cosmetic grade white oil, medical grade white oil, food grade white oil, etc.
White oil viscosity and viscosity index:
Viscosity reflects the internal friction of white oil and is an indicator of the oiliness and mobility of the oil. policy. The expression methods of viscosity include dynamic viscosity, kinematic viscosity, Engler’s viscosity, etc. The unit of kinematic viscosity is mm2, which is measured with a low-shear capillary viscometer. The kinematic viscosity of industrial white oil, etc. is generally measured at 40°C, while the kinematic viscosity of internal combustion engine oil and vehicle gears is measured at 100°C.
There is also a type of viscosity called dynamic viscosity, whose unit is mPa.s and is measured using a high-shear rotational viscometer. Since the viscosity of white oil products is temperature-dependent, viscosity without temperature is meaningless. Method for determination of kinematic viscosity of white oil GB/T265-1988. The measurement process is to measure the time it takes for a certain volume of liquid to flow through a calibrated glass capillary viscometer under gravity at a certain stable temperature. The product of the capillary constant of the viscometer and the flow time is the whiteness of the liquid measured at that temperature. Oil kinematic viscosity. The kinematic viscosity at temperature T is denoted by the symbol vt.
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