The purpose of water repellent finishes is that the drops of water should not spread on the surface of the textile and should not wet the fabric.
PDF) A short overview on water repellency for textiles
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Antistatic Finishes in Textile: Mechanism and Importance - Textile
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Flame Retardant Finishes in Textile: Mechanism, Chemicals
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FS III Ass 1 .pdf
Properties, performance and associated hazards of state-of-the-art