The feedstock to FCC is usually that portion of the crude oil that has an initial boiling point of 340 °C or higher at atmospheric pressure and an average molecular weight ranging from about 200 to 600 or higher.
Sirovina za FCC obično je sirova nafta koja ima početnu točku vrelišta na 340°C ili više pri atmosferskom tlaku i prosječnu relativnu molekularnu masu u rasponu od 200 do 600.