Patent ID: 7820775

Claim:
A tetrafluoroethylene polymer having stretchability and non-melt-processability and having a standard specific gravity of 2.140 to 2.165, wherein, with regard to the heat-of-fusion curve obtained by subjecting the tetrafluoroethylene polymer in the form of an unbaked polymer to be measured having no history of being heated to a temperature of 300° C. or higher to differential scanning calorimetry at a programming rate of 2° C./minute, the ratio between the amount of heat, S 2 mJ/mg, absorbed within the temperature range of from the temperature To° C., which is lower by 2.5° C. than the temperature Tp° C. corresponding to the minimum point on the curve, provided that 340<Tp<345, up to 350° C., and the amount of heat, S 1 mJ/mg, absorbed within the temperature range of from 320° C. up to the above-mentioned T 0 ° C., namely the ratio, S 2 /S 1 , is not lower than 0.90.