- Method ASTM D4530
- Repeatability variable, see method
- Reproducibility variable, see method
- Blending linear
- Additive Correction No
The purpose of this test is to determine the amount of carbon residue formed after evaporation and pyrolysis of petroleum materials under certain conditions and is intended to provide some indication of the relative coke forming tendency of such materials. The test results provided by this method are equivalent to the Conradson Carbon Residue test.
The carbon residue formed during this test will give a good indication of the amount of carbonaceous deposits the sample contains under degradation conditions. Samples that are high in metals, Ash, or sediment can cause higher results as they will not break down during the performance of the method.
The method is performed by weighing a sample into a weighed glass vial. This is then placed in the unit and heated to 500°C under a Nitrogen atmosphere. These conditions cause the sample to coke. While doing so the nitrogen will sweep away the volatiles in the sample. After removing the vial from the oven the sample is cooled and then weighed. These results are then used to perform a weight percent calculation.