Conradson Carbon Residue having the abbreviation of “CCR” or generally known as “Concarbon” is a test conducted in the laboratory to measure the amount of carbonaceous residue remaining after the pyrolysis and evaporation of the oil. This test method indicates the coke forming tendencies of the oil.

Different Carbon Residue values can be defined for a oil or fuel depending on the measurement method used which are chiefly or most commonly used methods for estimation of carbon residues, namely :