Flame resistance is an important requirement for products used in railway vehicles. Heretofore, a halogen-based fire retardant has been mainly applied; however, halogen acid is known to generate a gas which is poisonous to human beings in a combustive state. Accordingly, there is growing interest in halogen-free fire retardants. In recent years, the flame resistance of polymeric products has been increased remarkably through application of nanocomposites technology because nanocomposites, even in small quantities of additives improve their properties, of which flame resistance. For this reason studies have been carried out the application of nanocomposites to the floor sheet of railway vehicle.