| abstract |
The present invention provides a material that can be easily biaxially stretched, can be uniformly stretched even at a high stretch ratio, and can form a polytetrafluoroethylene porous membrane with low pressure loss. SOLUTION: Standard specific gravity (SSG) is 2.130-2.230, polytetrafluoroethylene (A) having fibrillation property, and melt viscosity at 380 ° C. not irradiated with electron beam or radiation. And a low molecular weight polytetrafluoroethylene (B) which is 1 × 10 2 to 7 × 10 5 Pa · s and which is not fibrillated. [Selection figure] None |