# NIOSH Pocket Guide to Chemical Hazards
Manganese tetroxide (as Mn) | CAS 1317-35-7
Mn3O4 | RTECS OP0895000
Synonyms & Trade Names Manganese oxide, Manganomanganic oxide, Trimanganese tetraoxide, Trimanganese tetroxide | DOT ID & Guide
Exposure Limits | NIOSH REL: See Appendix D
OSHA PEL†: C 5 mg/m3
IDLH N.D. | Conversion
Physical Description Brownish-black powder. [Note: Fumes are generated whenever manganese oxides are heated strongly in air.]
MW: 228.8 | BP: ? | MLT: 2847°F | Sol: Insoluble
VP: 0 mmHg (approx) | IP: NA |  | Sp.Gr: 4.88
Fl.P: NA | UEL: NA | LEL: NA |
Incompatibilities & Reactivities Soluble in hydrochloric acid (liberates chlorine gas)
Measurement Methods NIOSH 7300; OSHA ID121, ID125G
Personal Protection & Sanitation Skin: No recommendation Eyes: No recommendation Wash skin: No recommendation Remove: No recommendation Change: Daily | First Aid (See procedures) Eye: Irrigate immediately Skin: Soap wash Breathing: Respiratory support Swallow: Medical attention immediately
Respirator Recommendations To be added later
Exposure Routes inhalation, ingestion, skin and/or eye contact
Symptoms Asthenia, insomnia, mental confusion; low-back pain; vomiting; malaise (vague feeling of discomfort), lassitude (weakness, exhaustion); kidney damage; pneumonitis
Target Organs respiratory system, central nervous system, blood, kidneys
See also: INTRODUCTION