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 Water Reppelent




 
A water-repellent fabric is one in which the fibers are usually coated with a "hydrophobic" type of compound, and the pores are not filled in the course of the treatment.As the term implies, a water-repellent textile surface is one that appears to "repel" water. In such cases, the water does not wet or penetrate the surface of the textile fabric.
The tendency of a solid to resist wetting is a function of the chemical nature of the solid surface, the roughness of the surface, the porosity of the surface, and the presence of other molecules on the surface. When a drop of water comes to rest on a solid, or any intermediate form from complete wetting to complete no wetting.
 
Comparison between water-repellent and water-proof fabric