ePTFE is a multiporous membrane formed by expanding and stretching polytetrafluoroethylene as raw material. The experiment found that the surface of PTFE membrane is covered with fibril micropores, each square inch has up to 9 billion micropores, the section is a kind of network structure, in the three-dimensional structure of the hole has a network connection, hole insert, hole bending and other very complex structure. The diameter of water vapor molecules is 0.0004 micron, and rain in the smallest diameter of the light fog is 20 microns, the diameter of the drizzle has been up to 400 microns, PTFE micropore diameter change range in 0.1-0.5 micron, pore diameter between water vapor and rain, so it is the top waterproof breathable material. Composite fabric is composed of expanded polytetrafluoroethylene (ePTFE) film and polyester fiber through a special process.
ePTFE film waterproof:
ePTFE film also has the characteristics of non-wetting. It is resistant to water pressure up to 1800mbar, meaning that it is permeable only when the pressure is greater than 18 meters water column. General waterproof nylon waterproof degree is only 1000-2000mm, can only withstand the general shower; Slightly better 5000mm, can withstand heavy rain; The U.S. Army standard is only 7,000 mm, and PTFE is up to 20,00mm waterproof. Waterproof: general waterproof nylon water pressure resistance is only 1000-2000mm, can only withstand general showers, slightly better 5000mmH2O, can withstand heavy rain; TEX is waterproof up to 10,000 mm.
ePTFE film permeability:
The microporous structure of e-PTFE film can discharge brain vapor more quickly, so that sweat vapor does not accumulate and condense between the body surface and the fabric, so that the human body can keep dry and comfortable. The general detection value is 10000g/m224h, that is, the water vapor through each square meter of PTFE film in 24 hours reaches 10000g. General waterproof breathable cloth only 2000-3000g/m224hr. Permeability: The specification of permeability is g/m2/24h (grams per square meter per 24 hours), generally waterproof and permeable cloth only 2000-3000 g/m2/24h, and TEX moisture permeability up to 8000-10000 g/m2/24