| 摘要 |
A lubricant in the form of lubricating oil or grease, for use in contact with graphite or molybdenum disulfide or in contact with aluminum materials, which comprises a perfluoropolyether oil free from (CF<SUB>2</SUB>O)<SUB>n </SUB>groups as a repeat unit of polymer and having a kinetic viscosity at 40° C. of 50-1,500 mm<SUP>2</SUP>/sec., as a base oil, where F(CF<SUB>2</SUB>CF<SUB>2</SUB>CF<SUB>2</SUB>O)<SUB>m</SUB>C<SUB>2</SUB>F<SUB>5 </SUB>or RfO[CF(CF<SUB>3</SUB>)CF<SUB>2</SUB>O]<SUB>p</SUB>(CF<SUB>2</SUB>CF<SUB>2</SUB>O)<SUB>q</SUB>Rf' s used as the perfluoropolyether base oil. The lubricant undergoes no considerable deterioration of high-temperature characteristics (high-temperature durability), even if used in various uses as mentioned above, and also has distinguished low-temperature characteristics when the base oil has a kinetic viscosity of 50-250 mm<SUP>2</SUP>/sec.
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