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Carbon Residue (Conradson)
Definition:
Carbon Residue (Conradson) is the percent of coked material remaining after a sample of lubricating oil has been exposed to high temperatures under ASTM D189 (Conradson). Results are reported as a percentage of the weight of the original sample. As far as the affect of residue on performance, one opinion is that the type of carbon is of greater importance than the quantity. Since compounded oils contain metallic additives that generally leave a residue, other testing should be done to also identify the type of residue rather than just the amount.
Standard Test Method Used:
Conradson - ASTM D189 / IP13
Reporting Measurement:
%
Amount of Sample Needed:
200 mL
Test Limitation:
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