Abstract: A method for producing matrix material from thermoplastic wastes originating from communal and industrial rubbish. According to the method: a) the base material plastic waste is primary cleaned if necessary, depending on its solid contamination; b) after the possible primary cleaning step if necessary, the plastic waste is inputted into a recovering machine, where due to the pressure in the recovering machine and the heat transmitted to the material, the waste becomes a largely melted, nearly homogeneous and mostly fused mixture; c) the largely melted mixture is transferred into a heated internal mixing machine where the material is intensively mixed while adding heat; and d) if required, the melted material is transferred into a making-up machine, where matrix material blocks or matrix material products are produced. The invention relates also to the matrix material and the composite material produced from the matrix material.