The dropping point of grease is the temperature at which the thickener loses its ability to maintain the base oil within the thickener matrix. This may be due to the thickener melting or the oil becoming so thin that the surface tension and capillary action become insufficient to hold the oil within the thickener matrix. ASTM D2265 (preferred over the older and less precise ASTM D566) is the standard method used to determine the dropping point of grease. A small grease sample is placed in a cup and heated in a controlled manner in an oven-like device. When the first drop of oil falls from the lower opening of the cup, the temperature is recorded to determine the dropping point. Dropping point is a function of the thickener type. High drop points, typically above 240°C / 465°F, are commonly observed for lithium complex, calcium complex, aluminum complex, polyurea and clay greases while much lower dropping points are typical of conventional lithium (180°C / 355°F), calcium (180°C / 355°F) and sodium (120°C / 250°F) soaps.
The dropping point is one of the determinations that characterise the grease’s thermal stability. However it is NOT an accurate prediction of the grease’s upper operating temperature limit which is a function of many variables such as base oil oxidation stability, additive degradation, thickener shearing, oil separation and so forth. A high dropping point, while not a predictor of upper operating temperature, is an indicator of the maximum peak temperature that the grease may be subjected to for a short duration while not releasing oil excessively and therefore drastically reducing the life of the grease and potentially damaging the application in the long run.
MANUFACTURING PROCESS OF GREASE OIL is not very complicated. For the production, there is need usable and tried a formulation, ingredients ( additives, base oils,foam agent, pour point depressant, etc. ) and process tank. For ingredients to be used, quantities to be used and ingredients usage rankings, you should look into this formulation and manufacturing process. Therefore, formulation and productıon process of COMPLEX GREASE OIL are important. If you have not a good formulation, you cannot make healthy and efficient production of any lubricating oils.
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