CONRADSON CARBON RESIDUE COKING VALUE OF TAR AND PITCH: ASTM D2416
EXPLANATION
This test method is useful for indicating the relative coke-forming propensities and for evaluating and characterizing tars and pitches. This test method can also be used as one element in establishing the uniformity of shipments or supply sources. This test method is applicable to samples with an ash content not over 0.5 % as determined by Test Method ASTM D2415. Coking values obtained by this test method are practically the same as those obtained by Test Method ASTM D189, Conradson carbon, but the results are more reproducible. The apparatus used is identical, except that an electric furnace is substituted for gas flame.
TEST SUMMARY
A sample of tar or pitch is vaporized and pyrolized for a specified time at a specified temperature in special standardized equipment that limits the available oxygen supply. The percentage of residue is reported as the coking value.
TEST PRECISION
Repeatability: 1.0
Reproducibility: 2.0
