The basic properties of the complex material requirements for the weight, density, breaking strength, tear strength, abrasion resistance, Weatherability etc., the study is a plain weave glass fiber coated with a composite made of polytetrafluoroethylene material through weathering resistance, mechanical testing ... etc. assesses the feasibility of composite materials used. The weatherability evaluations of membranes conduct an investigation into the solar radiation effect of membrane materials by accelerated weathering test and outdoor exposure test. The period of outdoor exposure for membrane under specified load. It is the accelerated weathering test, which expose membrane to reach accumulated irradiance energy in a design condition. This study is evalmating the breaking strength and observing the appearance complex materials accelerated weathering exposure processes