In this work, we studied the application of perfluoro alkyl acrylic copolymer (Aversin KFC-I), a water-repellent agent, on 100% polyester fabric. The purpose of the study is to find an optimum recipe of water-repellent finishing that gives the fabric qualities required by an umbrella. The material for an umbrella is normally made of nylon or cotton. The latter is in general more expensive than the former. In addition to cost factor, cotton is normally much heavier than nylon, especially when gets wet. Polyester may offer some advantages over nylon both technically and economically. Technically, it has a lower moisture regain, which means that it retains less water than nylon does. It was found from the experiments that the best result was obtained by the use of 50 g/l Aversin KFC-I. Spray test showed a value of 100, which means wetting does not take place on the surface of 100% polyester fabric of concerned. (Ami Sebastian, Ari Rahmasari, Dini Nursari, Dreta Wulandari)
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