In the following experiments, samples of RDF-5 were produced by recovering certain kinds of industrial waste oil, from which recycle oil was produced. The production of the RDF-5 first used oil sludge as a base, and combined with wood or coal powder. Then PE was used as an adhesive to bind the raw materials together. Second, the raw materials were mixed in the granulator and mixer. After that the well-mixed material was heated and extruded through an extrusion machine. The cylindrical RDF-5 sample was 10–16 mm in length, and 5 mm in diameter.