# NIOSH Pocket Guide to Chemical Hazards
1,1-Dimethylhydrazine | CAS 57-14-7
(CH3)2NNH2 | RTECS MV2450000
Synonyms & Trade Names Dimazine, DMH, UDMH, Unsymmetrical dimethylhydrazine | DOT ID & Guide 1163 131
Exposure Limits | NIOSH REL: Ca C 0.06 ppm (0.15 mg/m3) [2-hr] See Appendix A
OSHA PEL: TWA 0.5 ppm (1 mg/m3) [skin]
IDLH Ca [15 ppm] | Conversion 1 ppm = 2.46 mg/m3
Physical Description Colorless liquid with an ammonia- or fish-like odor.
MW: 60.1 | BP: 147°F | FRZ: -72°F | Sol: Miscible
VP: 103 mmHg | IP: 8.05 eV |  | Sp.Gr: 0.79
Fl.P: 5°F | UEL: 95% | LEL: 2% |
Class IB Flammable Liquid: Fl.P. below 73°F and BP at or above 100°F.
Incompatibilities & Reactivities Oxidizers, halogens, metallic mercury, fuming nitric acid, hydrogen peroxide [Note: May ignite SPONTANEOUSLY in contact with oxidizers.]
Measurement Methods NIOSH 3515
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: (APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted canister providing protection against the compound of concern/Any appropriate escape-type, self-contained breathing apparatus
Exposure Routes inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms Irritation eyes, skin; choking, chest pain, dyspnea (breathing difficulty); drowsiness; nausea; anoxia; convulsions; liver injury; [potential occupational carcinogen]
Target Organs central nervous system, liver, gastrointestinal tract, blood, respiratory system, eyes, skin Cancer Site [in animals: tumors of the lungs, liver, blood vessels & intestines]
See also: INTRODUCTION