1,1-Dimethylhydrazine
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Synonyms & Trade Names
Dimazine, DMH, UDMH, Unsymmetrical dimethylhydrazineExposure Limits
NIOSH REL
Ca C 0.06 ppm (0.15 mg/m3) [2-hr] See Appendix AOSHA PEL
TWA 0.5 ppm (1 mg/m3) [skin]Physical Description
Colorless liquid with an ammonia- or fish-like odor.Molecular Weight
60.1Boiling Point
147°FFreezing Point
-72°FSolubility
MiscibleVapor Pressure
103 mmHgIonization Potential
8.05 eVSpecific Gravity
0.79Flash Point
5°FUpper Exposive Limit
95%Lower Explosive Limit
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.]Exposure Routes
inhalation, skin absorption, ingestion, skin and/or eye contactSymptoms
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, skinCancer Site
[in animals: tumors of the lungs, liver, blood vessels & intestines]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:
(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
- Page last reviewed:April 11, 2016
- Page last updated:April 11, 2016
- Content source:
- National Institute for Occupational Safety and Health (NIOSH) Education and Information Division