| 摘要 |
PROBLEM TO BE SOLVED: To provide a PTFE porous film having a fine pore grade in a range of nanometer exhibiting low flow resistance and high filtration efficiency which is used for filtration of various kinds of fluid and gas.SOLUTION: The PTFE porous film comprising a first porous surface and a second porous surface, and a bulk positioned between the first porous surface and the second porous surface, and having a fine pore grade in a range of about 2-50 nanometer is provided. The first and second porous surfaces have ratio of non-fusion node area to fusion node area equal to or more than 1 respectively. The production method and use method of the film are also provided. |
