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This paper presents a new sorting method between to differentiate acrylonitrile-butadiene-styrene (ABS) and Polystyrene (PS) by means of microwave cavity resonator perturbation. In this method, a small piece of sample material is inserted into a cavity resonator at a point when the electric and magnetic fields mark the maximum and the minimum values, respectively. Experiments were carried out with use of 1-, 2-, 5-, 10-GHz resonators and ABS and PS samples of various sizes. Loss angles of polarizability (tan χ) exhibited differences large enough to achieve accurate sorting between ABS and PS.

Sorting of Acrylonitrile-Butadiene-Styrene and Polystyrene Plastics by Microwave Cavity Resonance