PTFE is used microporous film crystallization of the PTFE material in close to its melting point temperature extrusion film and quickly pulled out with speed, cooling of the films after a second extension of control to a three-dimensional structure of films. Its diameter, thickness and porosity can be requested when the tension adjustment, the general Aperture 0.2 to 15 μ m and a thickness of 8 to 30 μ m, porosity as high as 80 ~ 97%. The microporous films without rules, porosity of the larger nodes to generally orderly, was strip layout. The following table:
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