NIOSH logo and tagline

Methyl hydrazine

Related Pages
Synonyms & Trade Names
MMH, Monomethylhydrazine
CAS No.
60-34-4
RTECS No.
MV5600000
DOT ID & Guide
1244 131
Formula
CH₃NHNH₂
Conversion
1 ppm = 1.89 mg/m3
IDLH
Ca [20 ppm]
See: 60344
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]
Measurement Methods
NIOSH 3510
See: NMAM or OSHA Methods
Physical Description
Fuming, colorless liquid with an ammonia-like odor.
Molecular Weight
46.1
Boiling Point
190°F
Freezing Point
-62°F
Solubility
Miscible
Vapor Pressure
38 mmHg
Ionization Potential
8.00 eV
Specific Gravity
(77°F): 0.87
Flash Point
17°F
Upper Explosive Limit
92%
Lower Explosive Limit
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
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]
Personal Protection/Sanitation
(See protection codes)
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

Important additional information about respirator selection

See also
INTRODUCTION   ICSC CARD: 0180   MEDICAL TESTS: 0142
Page last reviewed: October 30, 2019
Content source: National Institute for Occupational Safety and Health