Tetrafluoroethylene copolymer resin powder composition and process for manufacture thereof

In the process of forming a rotational lining on a surface from granules of a composition consisting essentially of tetrafluoroethylene/perfluoro (alkyl vinyl ether) copolymer particles and heat resistant filler, the improvement comprising carrying out the formation of said rotational lining by

• (a) utilizing granules of said composition prepared so that it has
• (i) an average particle size of 70-1000 .mu.m,
• (ii) a porosity of not more than 0.74,
• (iii) a specific shrinkage of not more than 5.1%, and
• (iv) a melt flow rate that satisfies the following equation:
• log .function..gtoreq.-0.70 log .eta.+2.83
• where .function. is the melt flow rate of the resin powder composition and .eta. is the specific melt viscosity at 372.degree. C. of the copolymer, and
• (b) incorporating into said composition from 0.05-5% by weight of polyphenylene sulfide particles having an average particle size of 0.3-50 .mu.m to thermally stabilize said composition during the formation of said rotational lining to obtain as a resultant thereof a smooth, non-peeling, essentially bubble-free lining on said surface.