After quantifying the plastic types,material was reduced to the grain size <0.5 mm inconsecutive steps by milling with a high performancecutting mill and sieving with different mesh sizes.Finally, 80 gram of the end fraction of 0.5 mm wasground to particle size <0.12 mm by an ultra centrifugalmill. Materials of display electronic products areregarded as general purpose Polystyrene (PS)composed of more than 90% High Impact Polystyrene(HIPS) grafted with rubber substances. Ten to twentypieces of each sample manufactured in the same yearof production were collected so as to minimize analyticalerror. Samples were analyzed by using EDX as RoHStest instrument. Results of the report conducted byproper filter for each sample interpreted throughanalysis of front cover (general purpose PS) are shownin Table 2 to 3.
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