Tonse tikudziwa kuti mapepala a pc hollow, omwe amadziwika kuti pc sheets, ndi dzina lonse la mapepala a polycarbonate. Ndiwo mtundu wazinthu zomangira zopangidwa kuchokera ku polycarbonate ndi zida zina za PC, zokhala ndi mapepala osanjikiza awiri kapena angapo osanjikiza ndi kutsekereza, kutsekereza kutentha, kutsekereza mawu, ndi ntchito zotsekereza mvula. Ubwino wake wagona pakupepuka kwake komanso kukana kwanyengo. Ngakhale mapepala ena apulasitiki amakhala ndi zotsatira zomwezo, mapepala opanda pake amakhala olimba kwambiri, omwe amatumiza kuwala kwamphamvu, kukana mphamvu, kutsekemera kwa kutentha, anti condensation, retardancy flame, insulation sound, ndi ntchito yabwino yokonza.