There are two main types of PTFE films: microporous membranes and turned films. The biggest difference between the two is that the microporous membrane is breathable, which is produced by biaxial stretching; the turning film is cut by a lathe and it is not gas permeable.

The PTFE microporous film is made of polytetrafluoroethylene resin particles, and after being expanded and expanded to form a microporous film, it is also divided into several types:

1. Air filter membrane

PTFE filter membrane can be used for atmospheric dust removal, air purification, etc. The pore size of the membrane can be controlled to 0.2um, the porosity can reach more than 88%, and various filter materials such as needle felt, machine cloth, non-woven fabric and glass fiber. The phase-recombination results in a membrane filter material with surface filtration performance. The PTFE membrane filter material has the characteristics of high peel strength, large gas permeability and uniform pore size distribution. As a dust-removing cloth bag or pleated dust-removing filter cartridge installed in the dust-removing equipment, it will quickly and effectively retain the ultra-fine powder calculated by micron. The dust removal efficiency can reach more than 99.99%, the service life is up to 3 years, and the air permeability can reach 3-6m. /min, is the world's most advanced air filter material, the best choice of various vacuum cleaners, air filter, air purification equipment, high efficiency air filter.

2. Waterproof and moisture permeable microporous film

The PTFE waterproof and moisture permeable microporous membrane is made by biaxial stretching through a special process. The surface of the membrane can reach several billion micropores per square inch, and the diameter of each micropore (0.1um-0.5um) is less than water. The minimum value of the smallest light mist in the molecule (20um-100un), and much larger than the diameter of the water vapor molecule (0.0003um-0.0004um), can make water vapor pass and water droplets can not pass, using this microporous structure can achieve excellent Waterproof and moisture permeable function; in addition, because the hole is extremely small and the longitudinal direction is not curved, the wind is impenetrable, and thus has the characteristics of windproof and warmth. The film has been continuously improved since its inception, and has been specially treated on PTFE film. Its firmness and durability are greatly improved. After being compounded with other fabrics, it is widely used in military clothing, medical clothing, casual wear, fire protection, and defense. Special protective clothing such as biochemical, anti-virus, and water-immersing operations, outdoor sportswear, shoes and hats, gloves and other accessories, as well as sleeping bags, tents and other materials.

3. PTFE bubble point film

It uses PTFE as raw material to form a microporous film after being stretched and stretched. The film is coated on various fabrics and substrates by special techniques to become a new filter material. The film has a small pore size. 0.2-0.5μm, even distribution, large porosity, while maintaining air circulation, it can filter all dust particles including bacteria to achieve advanced purification and ventilation purposes. It is widely used in pharmaceutical, biochemical, microelectronics and experiments. Room consumables and other fields.