1,2-Dimethylhydrazine

  • sym-Dimethylhydrazine
  • Symmetrical dimethylhydrazine
  • Hydrazomethane
Formula
CH3NHNHCH3
Structure
Description
A colorless liquid with an ammonia-like odor.
Uses
There are no known commercial uses, although it was evaluated exptl as high energy rocket fuel.

Registry Numbers and Inventories.
CAS
540-73-8
EC Index Number
007-013-00-0
RTECS
MV2625000
RTECS class
Tumorigen; Mutagen; Reproductive Effector
UN (DOT)
2382
Merck
12,3297
Beilstein/Gmelin
1730826
Beilstein Reference
4-04-00-03323
RCRA
U099
Swiss Giftliste 1
G-2006

Properties.
Formula
C2H8N2
Formula mass
60.1
Boiling point, °C
81
Vapor pressure, mmHg
82 (25 C)
Vapor density (air=1)
2.07
Odor Threshold Odor threshold 1 to 10 ppm
Density
0.826 g/cm3
Solubility in water
Very soluble
Refractive index
1.4209 (20 C)
Partition coefficient, pKow
-0.52
Heat of fusion
13.8 kJ/mol
Heat of vaporization
39.36 kJ/mol

Hazards and Protection.
Storage
Keep in a cool, dry, dark location in a tightly sealed container or cylinder. Keep away from incompatible materials, ignition sources and untrained individuals. Secure and label area. Protect containers/cylinders from physical damage.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Wear appropriate protective gloves, clothing and goggles.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Keep sparks, flames, and other sources of ignition away. Keep material out of water sources and sewers. Build dikes to contain flow as necessary. Attempt to stop leak if without undue personnel hazard.
Stability
No data.
Incompatibilities
Miscible with water with much evolution of heat contact of dicyanofurazan, or its n-oxide (dicyanofuroxan), with hydrazine, mono or dimethylhydrazine. Is instantaneously explosive.

Fire.
Flash Point,°C
-50
Fire fighting
Use water in flooding quantities as fog. Use alcohol foam, dry chemical or carbon dioxide. Cool all affected containers with flooding quantities of water. Do not extinguish fire unless flow can be stopped. Apply water from as far a distance as possible. Keep run-off water out of sewers and water sources.
Fire potential
Flammable. May ignite spontaneously when spread on combustible material.
Hazards
Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion and poison hazard indoors, outdoors or in sewers.
Combustion products
None Tends to re-ignite unless diluted with much water.

Health.
Carcinogin
I-2A, CP65
Poison_Class
1*
Exposure effects
CNS stimulation and seizures have occurred after absorption by any route.
   Ingestion
Anorexia and vomiting are common symptoms.
   Inhalation
Acute exposure to low concentrations of hydrazines may cause delayed death (days) and produce bronchial mucous destruction and pulmonary edema.
   Skin
Hydrazine may cause strong skin irritation.
   Eyes
See inhalation.

First aid
 
   Ingestion
Seek medical assistance.
   Inhalation
Move victim to fresh air. Apply artificial respiration if victim is not breathing. Do not use mouth-to-mouth method if victim ingested or inhaled the substance; induce artificial respiration with the aid of a pocket mask equipped with a one-way valve or other proper respiratory medical device. Administer oxygen if breathing is difficult. Remove and isolate contaminated clothing and shoes.
   Skin
Remove contaminated clothing and wash exposed area thoroughly with soap and water. A physician should examine the area if irritation or pain persists.
   Eyes
Irrigate exposed eyes with copious amounts of tepid water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist, the patient should be seen in a health care facility.

Transport.
UN number
2382
Response guide
Hazard class
6.1
Packing Group
I
 
USCG CHRIS Code
DML
 
Std. Transport #
4921251 4909352