Abstract: Glass fibers find use in automotive, building, marine, wood and numerous other industries, reaching 5 million tons annual consumption, mainly comprising the reinforcing phase in polymers. The high amount of industrial demand have also caused an increasing research interest for their recovery, recycle and reuse as solid waste treatment and utilization for cost effective and environmentally friendly production processes. In this study, the effects of matrix/fibers ratio on the mechanical and physical properties of glass fiber reinforced composites were investigated. The properties of polyesters were compared with the reinforced polyester. The microstructure of the composites was characterized by SEM-SE technique. It was determined that with the increasing glass fibers content, the flexural and impact strength were reduced, while the flexural modulus and hardness were enhanced and the total porosity was increased.