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Carbon Residue for a Fossil Fuel can be defined as the tendency of that Fuel to form Carbon Deposits at high temperature in an inert atmosphere. Carbon Residue for a Fuel is measured in weight percentage (wt %) or parts per million by weight (ppm wt). High Carbon Residue value is undesirable for a Fuel.

Different Carbon Residue values can be defined for a Fuel depending on the measurement method used. Ramsbottom Carbon Residue (RCR), Conradson Carbon Residue (CCR), Micro Carbon Residue (MCR) are the indexes used corresponding to three different measurement methods used.

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