Key Characteristics of PTFE Membranes (Polytetrafluoroethylene Membranes)

Microporous Structure
Porosity exceeds 85%, with 1.4 billion micropores per square centimeter and pore sizes ranging from 0.02 μm to 15 μm.
The surface features a spiderweb-like pattern with nodes formed at fiber bundle junctions; pore sizes vary between the membrane's sides and across its longitudinal and transverse axes, while the cross-section reveals a complex, three-dimensional network structure.
Chemical Stability
Resistant to corrosion from strong acids, strong alkalis, organic solvents, and oxidizing agents; suitable for anti-corrosion equipment in industries such as chemical processing and pharmaceuticals.
Temperature Resistance
Suitable for long-term use between -190°C and 260°C, with short-term tolerance up to 300°C; ideal for extreme environments such as aerospace applications and high-temperature industrial equipment.
Physical Properties
Low friction coefficient: Extremely low surface energy provides non-stick, water-repellent, and oil-resistant properties; commonly used for non-stick cookware coatings and industrial anti-stick components.
High strength: Tensile strength exceeds that of steel wire of the same diameter; highly durable.
Aging resistance: Strong resistance to ultraviolet (UV) radiation; long service life.
Functional Characteristics

Breathable and waterproof: ePTFE (expanded polytetrafluoroethylene) membranes feature a microporous structure created through a specialized stretching process, allowing gas passage while blocking liquids and particulates to achieve "waterproof yet breathable" functionality.
Electrical insulation: Excellent dielectric properties; suitable as insulation material for high-frequency electronic equipment.
High light transmission and heat reflectivity: Architectural PTFE membranes offer a light transmission rate of 8%–13% and heat reflectivity of up to 70%, creating an environment of natural diffused light while minimizing heat absorption.