This polymer is hydrophobic (water hating), biologically inert, non-biodegradable, and also has low friction characteristics and excellent “slipperiness.” The chemical inertness (stability) of PTFE is related to the strength of the fluorine-carbon bond. This is why nothing sticks to this polymer.
When stretched, PTFE forms a strong porous material called expanded PTFE (ePTFE). A commercial name for this form of Teflon in Goretex