This method describes a means for calculating the cetane index of diesel fuels from the aniline point, distillation, density and viscosity. The index, as computed from the prescribed formula, is termed the CGSB Cetane Index (CI). It is not applicable to fuels containing cetane improvers.

The testing and evaluation of a product against this method may require the use of materials and/or equipment that could be hazardous. This document does not purport to address all the safety aspects associated with its use. Anyone using this method has the responsibility to consult the appropriate authorities and to establish appropriate health and safety practices in conjunction with any existing applicable regulatory requirements prior to its use.