1) Residual carbon is an indirect indicator of colloidal and unstable compounds in oil products. The higher the residual carbon value, the more unstable hydrocarbons and colloidal substances in the oil product.

2) Light diesel uses 10% residual carbon as the indicator. The residual carbon value of diesel is a function of its distillation range and refining degree. The lighter and more refined the diesel fraction, the smaller the residual carbon value. So measuring the residual carbon of 10% diesel residue is of great significance for ensuring the production of high-quality diesel;

3) Lubricating oil made from heavy oil containing a large amount of colloidal substances has a high residual carbon value, which can be used to indirectly determine the degree of refinement of the lubricating oil;

4) Measuring the residual carbon in coking raw material oil can indirectly determine the available coke yield. The higher the residual carbon value, the higher the coke production.