After quantifying the plastic types,
material was reduced to the grain size <0.5 mm in
consecutive steps by milling with a high performance
cutting mill and sieving with different mesh sizes.
Finally, 80 gram of the end fraction of 0.5 mm was
ground to particle size <0.12 mm by an ultra centrifugal
mill. Materials of display electronic products are
regarded as general purpose Polystyrene (PS)
composed of more than 90% High Impact Polystyrene
(HIPS) grafted with rubber substances. Ten to twenty
pieces of each sample manufactured in the same year
of production were collected so as to minimize analytical
error. Samples were analyzed by using EDX as RoHS
test instrument. Results of the report conducted by
proper filter for each sample interpreted through
analysis of front cover (general purpose PS) are shown
in Table 2 to 3.
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