Samfurin Saiti na Filastik

Filastik abu ne na polymer (macromolecules) wanda aka haɓaka ta ƙari polymerization ko polycondensation dauki tare da monomers azaman albarkatun ƙasa. Ikon ta na rashin nakasawa matsakaici ne. Tsakanin zare ne da roba. Ya ƙunshi kwalliyar roba da filler, da robobi, da dasashirori. Ya ƙunshi abubuwan ƙari kamar wakilai, man shafawa, da launuka masu launi.
Babban kayan aikin filastik shine resin. Guduro yana nufin polymer wanda ba a gauraye shi da wasu abubuwan ƙari ba. Kalmar resin an fara kiranta da sunan lipids da tsire-tsire da dabbobi ke ɓoyewa, kamar su rosin da shellac. Gudun yana ɗaukar kimanin 40% zuwa 100% na nauyin nauyin filastik. Abubuwan da ake amfani da su na robobi sune ƙayyadadden yanayin resin, amma ƙari kuma yana da muhimmiyar rawa. Wasu robobi an hada su da kayan shafe-shafe, ba tare da wani ko kadan abubuwan karawa ba, kamar su plexiglass, polystyrene, da dai sauransu.