Water-repellent finishing is a chemical process by which a certain kind of textile material is made resistant to water penetration but at the same time still allows transportation of air. Fabric made of polyester-cotton is in general considered more comfortable than that of polyester alone. In this study, fluorocarbon-based chemical (Aversin KFC-I) was used to generate water-repellent properties on polyester-cotton fabric. This particular chemical has good properties as water-repellent finish: can be used for polyester-cotton fabric, good water-repellent properties, and does not change the color of the treated fabric. The addition of additives such as softener to the finishing liquor often produce an adverse effect to water-repellency, so experiment was also performed to investigate the effect of silicon type softener (Silicone N-100) to water-repellency. The data shows that the best result was obtained by the use of 90 g/l Aversin KFC-I without the addition of softener. Silicone N-100 only slightly improves the handle but it decreases the water-repellency of the treated fabric, which is obviously observed at higher concentration of Aversin KFC-I (90 g/l). (Esti Yuliani, Fernando S, Fina Dwi N, Ica Yuniarti)
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