Indonesia has a bit serious environmental issue related to the waste produced. The increasing number of plastic waste as well as rubber waste from tires becomes a problematic issue. The main problems of those waste are the air pollution produced when its burned, and a very long decomposition time of scrap tires in nature. Considering the abundant stockpile and its potential for recycling enough to urge this research. This research is focused on utilization of solid wastes as multi filler materials including rubber, melamine and sands in a plastic-based composites. The variables used in this research are the composition variables LDPE/melamine/sand/rubber 45/25/30/0, 45/25/25/5, 45/25/20/10, 45/25/15/15, 45/25/10/20, 45/25/5/25, 45/25/0/30 respectively. The specimens are characterized and tested by using SEM, FTIR, compression test, flexural test, hardness test, water absorption test, and density test. The effect of addition scrap tires rubber as filler show that it significantly changed the mechanical properties of the composites. The highest flexural strength of the composite is 20,18 MPa with composition of crumb rubber 5%.
