Pour point , Cloud point and Floc point

Pour Point

The Pour point of an oil is the lowest temperature at which the oil will flow or ‘Pour’

When tested under certain specified conditions. Of two oils having same viscosity 

One may have higher pour point than the other because of greater wax content, pour point

Of the oil should be well below the lowest temperature to be obtained in the evaporator

Cloud Point

Since all lubricating oil contains a small amount of paraffin, wax will precipitate from any oil 

If the temperature of the oil is dropped to a sufficiently low level, Because the oil becomes

Cloudy at this point, the temperature at which the wax begin to precipitate is called

Cloud point. If the cloud point of the oil is too high,wax will precipitate from the oil in the

Evaporator and EV , A small amount of wax on EV will make the system inoperative.

Floc Pont

Floc point of the oil is the temperature at which wax will start to precipitate from a mixture 

Of 90%R 12 and 10% oil by Volume , Since the oil soluble refrigerants lowers the viscosity

Of the oil and affects both pour point and cloud point the floc point of the oil is more important 

Property were oil miscible refrigerants are used