Grease composition and roller bearings

摘要

A fat composition (G) contains base oil, a thickener and an organically modified polysiloxane. The base oil is an alkyl diphenyl ether. The thickener is a urea thickener and the fat composition (G) contains 10 to 30 percent by mass of the thickener based on the total amount of the base oil and the thickener. The fat composition (G) contains 0.2 to 10 mass percent of the organically modified polysiloxane based on the total amount of the base oil and the thickener.