Plastik ichi bo'sh floatatsion shar issiqqa chidamli va kimyoviy korroziyaga chidamli plastmassalardan, shu jumladan polietilen (PE), polipropilen (PP), mustahkamlangan polipropilen (RPP), polivinilxlorid (PVX), xloridlangan polivinilxlorid (CPVC) va poliviniliden ftorid (PVDF) dan tayyorlangan. .