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PTFE micro-porous membranes are made from PTFE resin through a special stretching process. Under the microscope, microfibers are entangled to form a spiderweb structure, and the gaps between microfibers form numerous micropores. The porosity can reach over 80%, with pore sizes ranging from tens to hundreds of nanometers. Due to its excellent properties, PTFE micro-porous membranes are widely used in medical and health care, firefighting, chemical protection, and other fields.
Biaxial stretching is currently the main method for preparing PTFE micro-porous membranes. Membranes prepared by this method have small and evenly distributed pore sizes and high porosity. The basic process flow mainly includes mixing, pre-forming, extrusion, calendering, biaxial stretching, and heat setting. After biaxial stretching, PTFE appears as fibrous threads that are arranged in an interwoven manner, creating a microporous structure between the PTFE membrane fibers.
High Porosity
The porosity can reach 80% to 90%. The microporous structure is stable, with the fibers being interwoven, enabling effective interception of dust particles.
High Filtration Capacity
It has extremely high filtration efficiency, up to 99.999995%, meeting the filtration efficiency requirements for sub-high efficiency, high efficiency, and ultra-high efficiency air filters.
Long Service Life
The surface filtration mechanism allows easy dust removal. With small and evenly distributed pore sizes, strong hydrophobicity, low surface energy, and excellent non-adhesive capabilities, it effectively removes surface dust. Washing or backflushing can restore performance, greatly extending its service life.
Medical Protective Clothing
The high liquid barrier properties, high particle barrier properties, and high moisture and air permeability make PTFE micro-porous membranes very suitable for reusable medical protective clothing fabrics.
Medical Masks
PTFE micro-porous membrane masks have high filtration efficiency and are reusable. However, as particles deposit, airflow resistance increases. Combining PTFE micro-porous membranes with polypropylene melt-blown fabric can create high-performance mask products.
Firefighting Protective Clothing
PTFE micro-porous membranes are used as waterproof and breathable layers. They not only possess good waterproof and breathable properties and high temperature resistance but also have automatic grease-resistant properties, mitigating the significant degradation in waterproof and breathable performance of traditional firefighting clothing after multiple uses.
Chemical Protective Clothing
Using PTFE micro-porous membranes in selectively permeable biochemical protective clothing provides safety assurance for firefighters, soldiers, police, and others in extreme conditions. It not only effectively protects against harmful substances but also allows sweat permeability and heat resistance, with weight being only half that of traditional impermeable protective clothing.