Polyacrylonitrile (PAN) kaarboon kaarboon dareentaa waa iftiin tayo leh, yar yahay awood kuleyl gaar ah, jilicsan oo jilicsan, ku wanaagsan adiathermancy kuna habboon hawlgalka, kaas oo badbaadin kara tamar weyn. Sidaa darteed, xaraashka kuleylka ee saldhiga polyacrylonitrile aad ayuu u sarreeyaa hawo ama jawiga firfircoon, gaar ahaan, waxqabadka saldhigga polyacrylonitrile wuxuu deggan yahay xaalad heerkul aad u sarreysa, waana qalabka ugu wanaagsan ee kuleylinta kuleylka ee Vacuum Furnace.