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MCR - Micro Carbon Residue Assessment

Micro Carbon Residue (MCR) classification for residual fuels per ISO 8217 RMG/RMK - predicts carbonaceous deposit tendency in cylinders and piston crowns.

MCRCCAIHFO

MCR content% m/mAsphaltenes% m/m

MCR within 18 %

Yes

Asph / MCR ratio

0.43 -

Verdict

Within typical RMG/RMK range

Formula, assumptions, and limits

RMG380 MCR limit 18 %. Higher MCR + high asphaltenes = heavy cylinder deposits, burning throat wear, trumpet formation. Correlate with CCAI.

Symbol legend

Symbol	Meaning	Unit	Source
	Micro Carbon Residue	% m/m	ISO 10370
	n-heptane-insoluble fraction	% m/m	ASTM D3279 / IP 143