Method of producing graphite fiber-reinforced fluororesin composites

A method of producing a graphite fiber-reinforced fluororesin composite which comprises molding a composition comprising a fluororesin and a graphite fiber with a specific surface area of 0.6 to 25 m.sup.2 /g and a surface atomic oxygen/atomic carbon ratio of 0.10 to 0.20 as determined by X-ray photoelectron spectroscopic analysis, wherein said graphite fiber is a fiber obtainable

• (1) by oxidizing a graphite fiber at a temperature of 60.degree. C. to 120.degree. C. in a liquid phase containing an oxygen-containing compound, or at a temperature of 500.degree. to 1,000.degree. C. in a gas phase containing an oxygen-containing compound,
• (2) by comminuting a graphite fiber to 10 to 700 .mu.m in length in an oxygen-containing gas atmosphere,
• (3) by applying an inorganic oxidizing agent to the surface of a graphite fiber and heating the same at a temperature of 300.degree. to 1,000.degree. C.,
• (4) by subjecting a graphite fiber to electrolytic oxidation in an electrolyte solution capable of electrolytic oxidation using said fiber as the positive electrode, where an electric current of not less than 100 coulombs/g is passed through the electrolyte solution and the bath temperature is in the range of 20.degree. C. to 100.degree. C., or
• (5) by subjecting a graphite fiber to a plasma discharge treatment in the presence of an inert gas at a pressure of 0.001 to 10 Torr by applying an electric power of 10 W to 100 KW at a frequency of 10 kHz to 100 MHz and contacting the fiber with an oxygen-containing gas.