This paper addresses experimental evaluation for the following three cases to realize practical material recycling of special plastics. First, the influence of different plastic contamination for matrix plastics was examined. As a result, when polypropylene (PP) more than 1%got mixed with flame-retardant-polystyrene (FRPS), elongation and IZOD strength of FRPS decreased markedly, and importance of exclusion of PP was elucidated. Second, the case of different additives in the same plastics was examined. Then, it was found that the mechanical properties of material recycling plastics was not almost changed. However, we pointed out that the establishment of sorting and collection system of the plastics for used additive becomes important. Third, the case of contamination of painting pieces was examined. As a result, it was suggested that practical use became restricted because of the defects on the molding surface.
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