I-EPDM iwulwelwesi oluhlala isikhathi eside kakhulu lwenjoloba yokwenziwa (i-ethylene propylene diene terpolymer) esetshenziswa kakhulu ekufuleni okusendaweni ephansi.Izithako zayo ezimbili eziyinhloko, i-ethylene ne-propylene, etholakala kuwoyela negesi yemvelo.I-EPDM ingafakwa ngokunamathela ngokugcwele, noma ifakwe i-ballast, ngemithungo yesistimu yokufulela evalwe nge-seam tape.