NIOSH Pocket Guide to Chemical Hazards

Methyl cyclopentadienyl manganese tricarbonyl (as Mn) CAS 12108-13-3
CH3C5H4Mn(CO)3 RTECS OP1450000
Synonyms & Trade Names
CI-2, Combustion Improver-2, Manganese tricarbonylmethylcyclopentadienyl, 2-Methylcyclopentadienyl manganese tricarbonyl, MMT
DOT ID & Guide
NIOSH REL: TWA 0.2 mg/m3 [skin]
OSHA PEL†: C 5 mg/m3
IDLH N.D. Conversion
Physical Description
Yellow to dark-orange liquid with a faint, pleasant odor. [Note: A solid below 36°F.]
MW: 218.1
BP: 449°F
FRZ: 36°F
Sol: Insoluble
VP(212°F): 7 mmHg
IP: ?

Sp.Gr: 1.39
Fl.P: 230°F
UEL: ?
LEL: ?

Class IIIB Combustible Liquid: Fl.P. at or above 200°F.
Incompatibilities & Reactivities
Light (decomposes)
Measurement Methods
None available
Personal Protection & Sanitation
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated
Remove: When wet or contaminated
Change: No recommendation

First Aid (See procedures)
Eye: Irrigate immediately
Skin: Soap wash immediately
Breathing: Respiratory support
Swallow: Medical attention immediately
Respirator Recommendations To be added later
Exposure Routes inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms Irritation eyes; dizziness, nausea, headache; in animals: tremor, severe clonic spasms, lassitude (weakness, exhaustion), slow respiration; liver, kidney injury
Target Organs Eyes, central nervous system, liver, kidneys