# NIOSH Pocket Guide to Chemical Hazards
Methyl hydrazine | CAS 60-34-4
CH3NHNH2 | RTECS MV5600000
Synonyms & Trade Names MMH, Monomethylhydrazine | DOT ID & Guide 1244 131
Exposure Limits | NIOSH REL: Ca C 0.04 ppm (0.08 mg/m3) [2-hr] See Appendix A
OSHA PEL: C 0.2 ppm (0.35 mg/m3) [skin]
IDLH Ca [20 ppm] | Conversion 1 ppm = 1.89 mg/m3
Physical Description Fuming, colorless liquid with an ammonia-like odor.
MW: 46.1 | BP: 190°F | FRZ: -62°F | Sol: Miscible
VP: 38 mmHg | IP: 8.00 eV |  | Sp.Gr(77°F): 0.87
Fl.P: 17°F | UEL: 92% | LEL: 2.5% |
Class IB Flammable Liquid: Fl.P. below 73°F and BP at or above 100°F.
Incompatibilities & Reactivities Oxides of iron; copper; manganese; lead; copper alloys; porous materials such as earth, asbestos, wood & cloth; strong oxidizers such as fluorine & chlorine; nitric acid; hydrogen peroxide
Measurement Methods NIOSH 3510
Personal Protection & Sanitation Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: When contaminated Remove: When wet (flammable) Change: No recommendation Provide: Eyewash, Quick drench | First Aid (See procedures) Eye: Irrigate immediately Skin: Water flush immediately Breathing: Respiratory support Swallow: Medical attention immediately
Respirator Recommendations NIOSH At concentrations above the NIOSH REL, or where there is no REL, at any detectable concentration: (APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode/(APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus Escape: Any appropriate escape-type, self-contained breathing apparatus
Exposure Routes inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms Irritation eyes, skin, respiratory system; vomiting, diarrhea, tremor, ataxia; anoxia, cyanosis; convulsions; [potential occupational carcinogen]
Target Organs Eyes, skin, respiratory system, central nervous system, liver, blood, cardiovascular system Cancer Site [in animals: lung, liver, blood vessel & intestine tumors]
See also: INTRODUCTION