In this paper the utilisation of not pre-treated polyolefin wastes with vacuum residue in a visbreaker, the quality of the fission products and their further use are investigated. The results show that additions of not pre-treated polyolefin wastes to vacuum residue lead to no decreasing of the oil yield. The liquid products are comparable with them from pure vacuum residue. The visbreaker vacuum residue can be used as feedstock for gasification or as component of bitumen.