It consists of hydrocarbons having numbers predominantly in the range of C15 through C50 and boiling in the range of approximately 270 oC to 600 oC (518oF to 1112 oF).
Se compose d'hydrocarbures comportant 3 à 5 atomes de carbone (C3-C5) et dont l'intervalle d'ébullition est compris approximativement entre - 48 et 32 oC (entre - 54 et 90o F).]