The index value, as computed from the formula, is termed the Calculated Cetane Index. 2 1.2 The Calculated Cetane Index is not an optional method for expressing ASTM cetane number. It is a supplementary tool to estimate cetane number when used with due regard for its limitations.

So Cetane Index will remain same as before but Cetane Number will increase because very small quantities of Cetane Imrover are enough to increase Cetane Number but will not effect distillation and density. That is the reason why Cetane Index is not effected by addition of Cetane Improver while Cetane Number increases. Technical paper on diesel ignition quality properties and testing, The standard gives the following formula for calculated cetane index: ASTM D4737. Two equations for cetane index have been developed for calculated cetane index and are now included in ASTM D4737. The new equations are Cetane Index Calculator for Android $2.99. $2.99 JoeChua Android Version 1.0.1 Full Specs . Editors' Rating D4737 CCI- CALCULATED CETANE INDEX OF DISTILLATE FUELS. Cetane Testing. Diesel fuel cetane number testing. Cetane testing labs determine diesel fuel cetane numbers and other regulatory protocols. The cetane number, cetane index, and derived cetane number (IQT) tests measure the ignition quality of diesel, gasoil, biodiesel, heating gasoil and number-two fuel oil fuels. Petroleum products -- Calculation of cetane index of middle-distillate fuels by the four-variable equation This standard has been revised by ISO 4264:2018 ISO 4264:2007 describes a procedure for the calculation of the cetane index of middle-distillate fuels from petroleum-derived sources. Calculation of cetane index of middle-distillate fuels by the four-variable equation. Buy. Follow. Table of contents. Foreword. Petroleum products ? Calculation of cetane index of middle-distillate fuels by the four-variable equation. Buy. Follow. Table of contents. Foreword. D4737 CCI- CALCULATED CETANE INDEX OF DISTILLATE F