Membrane Structure
Breathable membrane material consisting of a thin polymer layer with millions of microscopic holes. Micro-porous polyurethane is applied to performance fabrics to provide a barrier that is waterproof yet allows sweat vapor to escape. The functionality of the layer depends on the pores being small enough to block liquid water but large enough for individual gas molecules.
Vapor Transmission
Microscopic voids in the polymer are created during the coagulation phase of the coating process. Because micro-porous polyurethane is naturally hydrophobic, the surface of the membrane resists the penetration of rain even under high wind pressure.
Coating Application
Continuous use in outdoor apparel is determined by the rate at which humidity can move through the textile. If micro-porous polyurethane is used, the garment remains dry on the inside even during periods of heavy physical exertion.
Durability Limit
Prolonged use and repeated washing can eventually clog the pores with dirt or detergents, which reduces the breathability of the material. Manufacturers use standardized tests to measure the water vapor resistance and ensure the coating meets the required specifications for technical outerwear. Direct lamination or transfer coating is used to bond the membrane to the base fabric.
This material is a staple in the production of high end sports and emergency service uniforms.
