TETRAFLUOROETHYLENE RESIN MOLDINGS, STRETCHED TETRAFLUORO- ETHYLENE RESIN MOLDINGS, PROCESSES FOR PRODUCTION OF BOTH,AND COMPOSITE MATERIALS, FILTERS, IMPACT DEFORMATION ABSORBERS, AND SEALING MATERIALS

摘要

A tetrafluoroethylene resin molded article obtained by fusing PTFE by heating a tetrafluoroethylene resin by heating, and then executing a gradual cooling or a cooling including a holding at a temperature equal to or higher than 313°C and lower than 321°C for 10 minutes or longer, and having, when heated to 365°C, then cooled to 245°C with a rate of -1°C/min, and then heated to 365°C with a rate of 10°C/min, a heat of fusion which, within a range from 296 to 343°C, is equal to or larger than 32 J/g and less than 47.8 J/g, a porous article obtained by expanding the molded article, and a composite article, a filter, an impact deformation absorber and a sealing material utilizing the molded article or the porous article.