# 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
Exposure Limits | 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
See also: INTRODUCTION