Polymeric Membrane Polytetrafluoroethylene (PTFE)
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Polymeric Membrane Polytetrafluoroethylene (PTFE)
Thanks to its low resistance to air passage and minimal reactivity to chemical compounds, the PTFE is used for the realization of membranes mainly dedicated to PM fraction sampling, in particular PM2.5, in environmental applications where the sample chemical integrity is a must. On the other hand, this material tends to be easily electostatically charged and has a low resistance to mechanical stress, it must be handled with care.
PTFE membranes may also be used in stack emission sampling but their low resistance to temperatures (max 230°C) must be kept in consideration. For PMx sampling, PTFE membranes are available also with PP or PMP support ring, which increases their resistance.