Patent ID: 6030428
Filing Date: 2000-02-29
Classification: B01D,B29C,B29K,B32B,C08J

Abstract:
A sheet-form polytetrafluoroethylene molding obtained by stretching an unsintered polytetrafluorothethylene sheet-form molding in the machine direction at a temperature lower than the melting point of sintered polytetrafluoroethylene, wherein analysis of said sheet-form polytetrafluoroethylene molding with a differential scanning calorimeter gives a crystal fusion curve having an endothermic peak in the temperature range of 345.+-.5.degree. C., and wherein said sheet-form polytetrafluoroethylene molding has a degree of crystallization of from 0.1 to 0.85 and a specific gravity of 1.4 or lower.