What is a PTFE membrane？

Polytetrafluoroethylene (PTFE) membrane is a microporous material made from a fluoropolymer through an advanced biaxial stretching process. It forms a unique spider-web-like micro-structure, with approximately 1.4 billion pores per square centimeter. The size of these pores ranges from 0.02 micrometers to 15 micrometers, enabling extremely high selectivity. It is renowned for its extremely strong chemical inertness, resistance to high and low temperature, and low friction coefficient.

What are the typical characteristics of PTFE membranes?

Chemical resistance: Almost unaffected by strong acids, strong bases, and organic solvents (such as hydrofluoric acid, aqua regia).

Temperature resistance: The long-term operating temperature range is from -180 ^oC to 260 ^oC, and it can withstand a short-term temperature of 400 ^oC.

Low surface energy and non-stick property: The friction coefficient is only 0.05 - 0.10, the surface tension is extremely low, and contaminants are difficult to adhere, thus possessing self-cleaning properties.

Waterproof and breathable property: The microporous structure can prevent liquid water from passing through, but allows water vapor to pass through.

What are the applications of PTFE membranes?

Due to PTFE membrane's unique properties—chemical resistance, high-temperature tolerance, and low friction—it has become a staple in diverse filtration and separation applications. PTFE membranes effectively filter out particles and liquids while allowing gases to pass through, making them ideal for industrial processing  filtration, food and beverage filtration, and biopharmaceutical filtration.

Additionally, the special porous structure of PTFE membrane enables free passage of air and water vapor while repelling liquid water. This waterproof yet breathable characteristic has led to its widespread use in automotive sensors, outdoor electronics, and chemical packaging as a reliable protect material.

Fig.2 The applications of PTFE membrane