# NIOSH Pocket Guide to Chemical Hazards
Hydrazine | CAS 302-01-2
H2NNH2 | RTECS MU7175000
Synonyms & Trade Names Diamine, Hydrazine (anhydrous), Hydrazine base | DOT ID & Guide 2029 132 (anhydrous) 3293 152 (</=37% solution) 2030 153 (37-64% solution) 2029 132 (>64% solution)
Exposure Limits | NIOSH REL: Ca C 0.03 ppm (0.04 mg/m3) [2-hour] See Appendix A
OSHA PEL†: TWA 1 ppm (1.3 mg/m3) [skin]
IDLH Ca [50 ppm] | Conversion 1 ppm = 1.31 mg/m3
Physical Description Colorless, fuming, oily liquid with an ammonia-like odor. [Note: A solid below 36°F.]
MW: 32.1 | BP: 236°F | FRZ: 36°F | Sol: Miscible
VP: 10 mmHg | IP: 8.93 eV |  | Sp.Gr: 1.01
Fl.P: 99°F | UEL: 98% | LEL: 2.9% |
Class IC Flammable Liquid: Fl.P. at or above 73°F and below 100°F.
Incompatibilities & Reactivities Oxidizers, hydrogen peroxide, nitric acid, metallic oxides, acids [Note: Can ignite SPONTANEOUSLY on contact with oxidizers or porous materials such as earth, wood & cloth.]
Measurement Methods NIOSH 3503; OSHA 20, 108
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, nose, throat; temporary blindness; dizziness, nausea; dermatitis; eye, skin burns; in animals: bronchitis, pulmonary edema; liver, kidney damage; convulsions; [potential occupational carcinogen]
Target Organs Eyes, skin, respiratory system, central nervous system, liver, kidneys Cancer Site [in animals: tumors of the lungs, liver, blood vessels & intestine]
See also: INTRODUCTION