The stability of PTFE (polytetrafluoroethylene) vent membranes under high temperature and high pressure is one of their defining advantages, rooted in the material's exceptional chemical and physical resilience. PTFE possesses a unique molecular structure with strong carbon-fluorine bonds, granting it remarkable thermal stability compared to many other polymeric materials.

Under high temperatures, PTFE vent membranes typically maintain their integrity up to 260°C (500°F) in continuous use, with short-term tolerance for temperatures exceeding 300°C (572°F). Unlike conventional plastics that may soften, melt, or degrade, PTFE retains its structural rigidity and microporous architecture at elevated temperatures, ensuring consistent gas permeability and waterproofing performance.

Chemical inertness further enhances stability under extreme conditions, as PTFE is resistant to oxidation, hydrolysis, and corrosion from most chemicals. This prevents degradation reactions that could weaken the membrane under combined high temperature and pressure stress.

These stability characteristics make PTFE vent membranes reliable for demanding environments where consistent venting performance under harsh operating conditions is required.