STRETCHED POLYTETRAFLUOROETHYLENE POROUS ARTICLE HAVING FINE PORES FORMED THEREIN AND METHOD FOR PRODUCTION THEREOF, AND METHOD OF ABLATION MACHINING

摘要

A stretched polytetrafluoroethylene porous article having fine pores formed therein, wherein fine pores having a pore diameter greater than the average pore diameter of said stretched polytetrafluoroethylene porous article are formed by the irradiation with a pulse laser beam having a pulse width of 10 picoseconds or less, and a fine porous structure of the wall surface of said fine pore is not broken and is substantially retained; a method for producing the stretched polytetrafluoroethylene porous article; and a method of ablation machining.