PTFE Porosity

The microstructure of PTFE can be described as roughly parallel-running clumps of material (nodes) with perpendicular fibers connecting them. Fibers connected between the nodes are called fibrils. Porosity is a function of the distance between the nodes. As the internodal distance decreases, porosity decreases. Conversely, as the internodal distance increases, porosity increases. 

eptfe fibril porosity

eptfe porosity nodes

ePTFE Bend Example

ePTFE Compress Example