The material used in this study is 100% cotton, and is intended for use as working uniform in steel industry or metal workshop. The selection was made based on the absorption property of cotton which is normally attributed to higher comfort. One of the most important requirements for any outfit used in such an environment like steel industry or metal workshop is adequate flame retardancy, that is material should not easily be consumed by fire and not propagate flame. This study was aimed at finding an optimum formula and condition for flame retardant finishing of 100% cotton without giving any adverse effect to its handle as well as its absorption. The fabric was first treated with nitrogen-containing phosphor compound (Pyrovatex CP New) to give the desired flame retardant property, and then with softening agent (Silicone N-100) to improve its handle. Cotton fabric treated with 500 g/l Pyrovatex CP New and 30 g/l Silicone N-100 showed good flame retardancy before repeated laundering, with ignition time and char length less than 2 seconds and 6 inch respectively, but then it failed to reach the same level of performance after 5 times repeated laundering. This shows that the treatment can only give a non-durable flame retardancy. (Shinta Citra N, Taufiq F, Wawan G, Yanti R)
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