I-PTFE iyona endert kakhulu, kepha inokuphelelwa amandla ampofu, ngakho-ke ayilungele imijovo eminingi noma isitoreji. Nge-Septa ebekiwe (efana ne-PTFE \ silicone), ukumelana kwamakhemikhali kwe-Septum yi-PTFE kuze kube se-Septum kuthathwa.
