The use of thermally bonded nonwovens is very versatile. This type of nonwovens are used in different fields such as apperal lining, diapers, car interior, masks and composite materials used in shoe making. The use of synthetic fibers is associated with environmental pollution, thus the use of natural fibers in production of thermo-bonded nonwovens due to factors such as recycle-ability, biodegradablbility and low energy consumption, has attracted many interests. Absorption properties, comfort, physiological compatibility together with preferable mechanical properties of cotton fibers has resulted in wide spread of use of cotton fibers in nonwovens with medical application. In this study, Estabragh fibers as an indigenous natural with having unique properties were used for production of thermo-bonded nonwovens samples.Estabragh is cultivated in the southern regions of the central Iranian plateau. The plant grows wild and has seed containing lustrous silky acicular fiber. The low density of the fibers (0.9 g/cm 3 ) is due to hollow structure of Estabragh. Therfore composites made using Estabragh are light weight and voluminous. These natural fibers impart numerous desirable properties such as comfort and hairiness, to the composite materials reinforced with thermo-bonded nonwoven textiles. It should be noted that the number literatures directly delt with mechanical properties of thermo-bonded nonwovens made of Estabragh fibers is very limited. The aim of this study is to manufacture thermally bonded Estabragh based nonwoven textiles as primary fibers and polypropylene fibers as the binder. Eighteen samples using carded webs containg Estabragh/polypropylene fibers in ratios of 90/10, 75/25, 60/40, 45/55, 30/70, and 15/85 having areal density of 50, 100, and 150 g/cm 2 were prepared on laboratory-scale carding machine according to Taguchi experimental design criterion. The samples were needled using a laboratory-scale needling machine. The needled samples were thermally bonded on a cylindrical thermo-bonding machine. The needling and thermo-bonding processes are vitally important due to lack of crimp in Estabragh fibers and subsequent low cohesion of the fibrous layer. The variable parameters selected were needling density, cylinder temperature and speed. According to the Taguchi orthogonal arrays designed by MINITAB.14 software, three punching densities 20.3, 25.4 and 30.5 needles per cm 2 together with calender temperature 150, 175 and 185 °C were selected during course of this work. The calender rotational speed was set at 3.5, 4.0 and 4.5 rpm. Using a zwick tensile tester, mechanical properties of samples such as bending rigidity, breaking force, breaking length and work of rapture were determined. In this study, statistical analysis were employed to establish the effects of various variables such as blending ratio, layer weight, punching density, calender temperature and rotational speed on Estabragh/polypropylene thermo-bonded nonwovens. The results revealed that parameters blending ratio, layer weight and the calender temperature of thermo-bonding process, significantly affected the samples breaking force. It was concluded that punching density and calendar rotational speed can also affect the results. As far as parameters such as bending rigidity, breaking length and work of rapture were concerned it was found that Estabragh content of the blend and also layer weight are the most influential factors. Changes in punching density significantly affected bending rigidity and breaking length. It was revealed the increased rotational speed can only affect breaking length of samples. Keywords: Nonwovens, thermal bonding, Estabragh fiber, Polypropylen fiber, mechanical properties.