Abstract: Disclosed is a process for making fire resistant materials, such as fabrics or barriers, comprising the steps of selecting cellulosic fibers and optionally synthetic fibers; feeding a machinery serving to make the nonwoven material with the fibers, and treating the fibers at least one time with at least one fire retardant chemical compound while the machinery is making the non-woven material for obtaining the requested fire resistant nonwoven material. Preferably, an aqueous solution containing the fire retardant chemical compounds is spread on the nonwoven web before, during and/or after the web is heated up during a thermo bonding step of the process. The process is environmentally friendly and allows for higher impregnation of the fibers with fire retardant chemicals.