The biggest difference between the two is the permeability of microporous membrane, which is produced by biaxial stretching.
Polytetrafluoroethylene (PTFE) microporous membrane is made from polytetrafluoroethylene resin particles. After expansion and stretching, microporous membrane is formed. It is also divided into the following types:
1. Air filtration membrane
Polytetrafluoroethylene filter membrane can be used for atmospheric dust removal, air purification and so on. The pore size of the membrane can be controlled at 0.2um and the porosity can reach more than 88%.
It can be used with needle felt, woven fabric, non-woven fabric, glass fiber and other filter materials. Phase composite materials can be used to obtain membrane coated filter materials with surface filtration performance.
The filter material coated with PTFE membrane has the characteristics of high peeling strength, large air permeability and uniform pore size distribution. As a dust collection bag or pleated filter element installed in the dust removal equipment, it will quickly and effectively intercept the ultra-fine powder calculated in micron.
The dust removal efficiency can reach more than 99.99%, the service life can be as long as 3 years, and the air permeability can reach 3-6M/ Min is the most advanced air filter material in the world, and the best choice for all kinds of vacuum cleaners, air filter elements, air purification equipment, high efficiency air filter, etc.
2. Waterproof and moisture permeable microporous membrane
Polytetrafluoroethylene waterproof and moisture permeable microporous membrane is made by special technology and biaxial tension.
The surface of the membrane can reach several billion micropores per square inch, and the diameter of each pore (0.1 um-0.5 UM) is smaller than that of water. The minimum value (20um-100un) of the smallest mist in molecules is much larger than the molecular diameter (0.0003um-0.0004um) of water vapor, which allows water vapor to pass through, but water droplets cannot.
The microporous structure can achieve excellent waterproof and moisture permeability; in addition, because the pores are very small and irregularly curved longitudinally, the wind can not pass through, and it has wind resistance and good thermal insulation. Since its inception, the film has been constantly improving.
The special treatment of PTFE membrane greatly improves its firmness and durability. After compounding with other fabrics, it can be widely used in military clothing, medical clothing, leisure clothing, fire prevention and fire prevention.
Special protective clothing, such as biochemical, anti-virus and water immersion operation, accessories, such as outdoor sports clothes, shoes, hats, gloves, sleeping bags and tents.
3. PTFE bubble point film
It uses polytetrafluoroethylene (PTFE) as raw material to form microporous membrane after expansion and stretching. The membrane is laminated on various fabrics and substrates by special process, and becomes a new type of filtration material.
The pore size of the membrane is small, about 0.2-0.5 μ m, with uniform distribution and large porosity. At the same time, it can filter out all dust particles including bacteria, so as to achieve the purpose of advanced purification and ventilation. It is widely used in pharmacy, biochemistry, microelectronics and laboratory consumables.