Ndị na-emepụta ihe nkiri polyester nke nwere metallized kpuchiri ekpuchi na-ejikarị ihe nkiri polyester metara dị ka dielectric, nke ejiri akwa ọla kpuchie n'akụkụ abụọ dị ka efere, ma na-ekpuchi ya site na ihe mkpuchi (na-emekarị plastik ma ọ bụ resin). Ụdị nkwakọ ngwaahịa a na-enyere aka ichebe nhazi nke ime nke capacitor ma gbochie mmetụta nke gburugburu ebe obibi na capacitor.