In recent years, with the development of technology the use of electronic d evises has been increasing with environmental pollution caused by destructive and harmful electromagnetic (EM) waves . Subsequently , shielding against EM waves is important in many aspects with human health as a crucial concern . Blocking the transmission of EM waves through the body, is called electromagnetic shielding(EMS) . In this research, considering all protective materials, methods , comparing their be nefits and drawbacks were compared in an attempt to manufacture a knitted fabric with shielding effect. Creating shielding effect was carried out by two different methods including using conductive yarns in knit structure and the other one was deposition metallic particles on the fabric su rface. Conductive Copper yarn was fabricated via its wire w ith insulating layer as skin and twisting that with cotton yarn. The first fabric was knitted by copper / cotton yarn, for the next one stainless steel / cotton fibers yarn was applied and finally the third one prepared by 100% cotton yarn. In order to find out the best chemical finishing method for aluminum particles deposition on the fabrics surface, blade on the table coating, coating using totally open mesh, padding and sonication were examined while the tested physical method was vacuum evaporation. The samples evaluations were carried out by measuring shielding effectiveness, surface electrical resistance, thickness, a ir permeability, m oisture absorption, fastness properties and their surface a nalysis via scanning electron microscopy and s tereo microscope. The results indicated, the amount of EMS depends on the orientation of the shielding’s material with the electric field’s wave . I n addition, it was revealed that having continuous conductive y arn in t he fabric structure is more effective in shielding than the acquired obtained effect by metal particle deposition due to porous structure of the fabrics. Furthermore, it was evident that the efficacy of the finishing method in creating EMS is direc tly related to the structure and fibers used in the fabric. It was found that the knitted sample by stainless steel / cotton fibers after Aluminum - Chromium alloy vapor deposition with 0.694mm thickness present shielding against EM waves by 24dB ( 99. 5 % ) in the frequency range of 8 - 12GHz . Moreover, treated samples showed acceptable wash and abrasion fastness , air permeability and moisture absorption for apparel applications
