Patent ID: 8822394

Claim:
A method comprising: applying a lubricating grease composition to a mass flywheel, wherein the lubricating grease composition comprises: (i) a base oil having a density in the range of from 800 to 1000 Kg/m 3 ; and (ii) a diurea compound having a density in the range of from 850 to 1050Kg/m 3 ; wherein the difference in the densities of the base oil (i) and the diurea compound (ii) is less than 50 Kg/m 3 , and wherein the diurea compound is obtained by reacting a diisocyanate and a mixture of monoamines, the mixture of monoamines comprising a C 6 -C 10 aliphatic amine and a C 14 -C 20 alphatic amine.