It consists predominantly of olefinic hydrocarbons having a carbon number of C5 and boiling in the range of approximately 33 oC to 60 oC (91oF to 140oF).] ###>It consists predominantly of olefinic hydrocarbons having a carbon number of C5 and boiling in the range of approximately 33 oC to 60 oC (91 oF to 140 oF).]