To provide a lubricating grease which is excellent in high-temperature durability, exhibits a low dust generation, a low volatility, and a high fretting resistance in high-speed applications, and is cheaper than a fluorine-based grease; and a roller bearing with the lubricating grease confined therein.
The lubricating grease is a grease mixture of a fluorine-based lubricating grease comprising a perfluoropolyether oil as the base oil and a fluororesin powder as the thickening agent and a urea-based lubricating grease comprising a synthetic oil other than a perfluoropolyether oil as the base oil and a urea compound as the thickening agent. When the grease mixture is left standing at 200°C for 250 hr, its evaporation amount is 15 wt% or lower.
ASO MITSUNARI
KATAGIRI TSUTOMU
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