Calculation Methods
There are three methods to calculate this carbon residue. It may be expressed as Ramsbottom Carbon Residue (RCR), Conradson Carbon Residue (CCR) or Micro Carbon Residue (MCR). Numerically, the CCR value is the same as that of MCR. Sometimes the carbon residue value can be listed as Residual Carbon Content, RCC, which is normally the same as MCR/CCR.
For the test 4 grams of the sample are put into a weighed glass bulb. The sample in the bulb is heated in a bath at 553°C for 20 minutes. After cooling the bulb is weighed again and the difference noted.
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