Silsilada miiska caaga ah waxay ka samaysan yihiin balaastiig injineernimo waxayna ku xiran yihiin biinanka birta ah.
Silsiladahan waxaa inta badan loo adeegsadaa warshadaha cuntada iyo baakadaha si loogu keeno noocyo badan oo weel ah.Tusaale ahaan: dhalada PET, dhalada petaloid PET, Aluminium iyo qasacadaha birta, kartoonada, saxarada, alaabada baakadaysan, dhalo, weel caag ah.