The problem of debris left by the melamine plant in the industrial sector, which contributes to the cost of debris removal and the removal of these also pollutes the environment. This project aims to study the mechanical properties of polymer composites between LDPE and melamine powder, a substance used LDPE and debris using melamine as a reinforce. The study will consider the factors of influence of particle size debris filling ratio of melamine and melamine debris on the mechanical properties of composite materials. The mechanical properties test are divided into tensile test ,impact test ,hardness test and bending test to bring the property to be used as a basis for the decision to use composite materials in the manufacturing else.