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Seam sealants are sprayed or extruded over the joined edges of these overlaps, and they then either cure to a flexible waterproof "seal" by drying (dehydrating) in the case of water borne compositions, or thermoset irreversibly to a flexible adherent seam seal by going through an oven bake in the case of plasticized polyvinylchloride compositions.
A garment described as waterproof will have a water-repellent coating, with the seams also taped to prevent water ingress there. Better waterproof garments have a membrane lining designed to keep water out but allow trapped moisture to escape ("breathability")—a totally waterproof garment would retain body sweat and become clammy. Waterproof ...
Often, barrier testing is conducted on a sheet of material. Calculations based on that can be useful when designing completed structures, clothing, and packages. Seams, creases, access points, and heat seals are critical to end-use performance.
Gore-Tex is W. L. Gore & Associates's trade name for waterproof, breathable fabric membrane. It was invented in 1969. Gore-Tex blocks liquid water while allowing water vapor to pass through and is designed to be a lightweight, waterproof fabric for all-weather use.
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[citation needed] Also known as "foul weather gear", contemporary oilskins include such innovations as DWR-coated nylon on their low end [2] and Gore-Tex and other proprietary waterproof membranes on the high. [3] A Sou'wester, a traditional form of collapsible oilskin rain-hat, is longer in the back than the front to fully protect the neck. [4]