Patent ID: 7528221

Claim:
A polytetrafluoroethylene molded article obtained by molding a modified polytetrafluoroethylene molding powder, wherein said modified polytetrafluoroethylene molding powder is not melt-moldable, a modified polytetrafluoroethylene constituting said modified polytetrafluoroethylene molding powder contains 0.01 to 1% by mass of a perfluorovinyl ether unit represented by the formula (I): (wherein X is a perfluoroalkyl group containing 1 to 6 carbon atoms or a perfluoroalkoxyalkyl group containing 4 to 9 carbon atoms) and the heat of crystallization of the modified polytetrafluoroethylene constituting the modified polytetrafluoroethylene molding powder is 18.0 to 25.0 J/g as measured using a differential scanning colorimeter, and said polytetrafluoroethylene molded article has a heat of fusion of not more than 28 J/g and a flex life of at least 200×10 4 cycles.