1, Polystyrene (PS). Mar as trice ris an canar rubair cruaidh, tha feartan polystyrene granular gun dath, follaiseach, gleansach mar a leanas a, deagh fheartan optigeach b, feartan dealain sàr-mhath c, pròiseas cumadh furasta d. Feartan dathte math e. Is e an ana-cothrom as motha a tha ann am brisg f, tha e ...
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