Waste car side windows were crushed to grain size 4-8 mm and used as fillers (76.28% by mass) in polyester resin-matrix composites (polymeric concretes). The composites were cured with (MeEtCOOH)(2)O-2 and studied ford., water absorbability and permeability as well as for bending and compressive strengths. The composites showed higher quality than the analogous composites filled with sand or gravel.