Compared to Chill Roll where the chill-zone is graphite-free clear white , Indefinite Roll is cast using such proportion of solocon, chromium, nickel and molybdenum that the working face is no longer completely white but contains a small amount of very finely divided graphite flakes gradually increasing from face to core with corresponding decrease in the amount of carbide.The rolls are to ensure minimum sacrifice of clear chill while achieving maximum functional depth. Thus indefinite Chill Rolls are superior in biting performance and have enough strength and resistance against thermal shock occuring at the time of accident in the rolling operation .