Importance

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Abstract

A lubricating grease composition, which comprises a base oil consisting of a mixture of 100 parts by weight of at least one of a perfluoropolyether oil (A), represented by RfO[CF(CF.sub.3)CF.sub.2O].sub.p(CF.sub.2CF.sub.2O).sub.qRf (where Rf is a perfluoroalkyl group having 1-5 carbon atoms, p+q=2-200, q/p=0-2, and q may be 0), and a perfluoropolyether oil (B), represented by F(CF.sub.2CF.sub.2CF.sub.2O).sub.sC.sub.2F.sub.5 (where s=2-100), and 0-100 parts by weight of at least one of a perfluoropolyether oil (C), represented by RfO(CF.sub.2CF.sub.2O).sub.m(CF.sub.2O).sub.nRf (where m+n=3-200 and m:n=10-90:90-10), and a perfluoropolyether oil (D), represented by RfO[CF(CF.sub.3)CF.sub.2O].sub.a(CF.sub.2CF.sub.3O).sub.b(CF.sub.2O).sub.-cRf (where a+b+c=3-200, b is 0 or an integer of 1 or more, and c is an integer of 1 or more), preferably further admixed with a thickening agent, can suppress corrosion of metallic materials by corrosive gases and also has a good heat resistance.

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First Claim