A seal which is for use in a gasoline engine, particularly in a crankshaft for the engine, which exhibits a loss tangent, tan, of 0.13 or less at a frequency of 80Hz and an ambient temperature of 100ºC and is made of a cured product of a vinylidene fluoride-tetrafluoroethylene-perfluoro(methyl vinyl ether) terpolymer, and which is used as a lip-type end-face seal for a sealing device for sealing the annular space between two members that are assembled in such a state that the members can rotate freely, relatively and concentrically with each other, namely, a housing and a rotating shaft. This seal for a gasoline engine can continue to prevent the leakage of a fluid sufficiently even under high-temperature and high-revolution conditions, and therefore can be effectively used as a packing material for a sealing device for a crankshaft for a gasoline engine or the like.
展开▼
