Durable FR Cotton Blends: 88% Cotton /12% Nylon Blends of cotton and nylon are designed to increase abrasion resistance compared to similar woven and knit fabrics. Woven fabrics are constructed with a 75% cotton/25% nylon warp and a 100% cotton filling. The overall blend is 88% cotton/12% nylon. Knit fabrics may be made with an intimate blend of cotton and nylon, or by other methods like plating. These fabrics are made flame-resistant by application of a flame retardant. This finish can be either a phosphonium salt precondensate polymerized with gaseous ammonia (THPOH-NH3), or a heat-cured dialkylphosphonamide. These processes bind the flame retardant to cotton fiber FR for durability. Either process has little effect on fabric hand and performance. Among fabrics produced by the “ammonia cure” process are AMTEX® by Mount Vernon Mills, Inc., Banwear® by ITEX, Inc. and INDURA® Ultra Soft® by Westex Inc. Many knit and fleece fabrics are produced by the heat cure process.