IPCS INCHEM Home
1,1-DIMETHYLHYDRAZINEICSC: 0147
November 2008
CAS #: 57-14-7Dimethylhydrazine
N,N-Dimethylhydrazine
unsym-Dimethylhydrazine
UDMH
UN #: 1163
EINECS #: 200-316-0

  ACUTE HAZARDS PREVENTION FIRE FIGHTING
FIRE & EXPLOSION Highly flammable. Gives off irritating or toxic fumes (or gases) in a fire.  Vapour/air mixtures are explosive. Risk of fire and explosion on contact with oxidants.  NO open flames, NO sparks and NO smoking. NO contact with oxidizing agents or acids.  Closed system, ventilation, explosion-proof electrical equipment and lighting. Do NOT use compressed air for filling, discharging, or handling. Use non-sparking handtools.  Use powder, alcohol-resistant foam, water in large amounts, carbon dioxide.  In case of fire: keep drums, etc., cool by spraying with water. 

 AVOID ALL CONTACT! IN ALL CASES CONSULT A DOCTOR! 
  SYMPTOMS ACUTE HAZARDS FIRST AID
Inhalation Cough. Sore throat. Burning sensation. Nausea. Headache. Vomiting. Laboured breathing. Convulsions.  Use ventilation, local exhaust or breathing protection.  Fresh air, rest. Half-upright position. Refer immediately for medical attention. 
Skin MAY BE ABSORBED! Redness. Pain. Further see Inhalation.  Protective gloves. Protective clothing.  First rinse with plenty of water for at least 15 minutes, then remove contaminated clothes and rinse again. Refer for medical attention . 
Eyes Redness. Pain.  Wear face shield or eye protection in combination with breathing protection.  Rinse with plenty of water (remove contact lenses if easily possible). 
Ingestion Sore throat. Further see Inhalation.  Do not eat, drink, or smoke during work. Wash hands before eating.  Rinse mouth. Rest. Do NOT induce vomiting. Refer immediately for medical attention. 

SPILLAGE DISPOSAL CLASSIFICATION & LABELLING
Remove all ignition sources. Evacuate danger area! Consult an expert! Personal protection: complete protective clothing including self-contained breathing apparatus. Do NOT let this chemical enter the environment. Collect leaking liquid in sealable non-plastic containers. Do NOT absorb in saw-dust or other combustible absorbents. Absorb remaining liquid in sand or inert absorbent. Then store and dispose of according to local regulations. 

According to UN GHS Criteria

flam;flameskull;toxiccancer;health haz
DANGER
Highly flammable liquid and vapour
Fatal if inhaled
Toxic if swallowed or in contact with skin
Causes mild skin irritation
Causes eye irritation
Suspected of causing genetic defects
Suspected of causing cancer
Causes damage to organs
Causes damage to the nervous system and the blood through prolonged or repeated exposure if inhaled
Toxic to aquatic life 

Transportation
UN Classification
UN Hazard Class: 6.1; UN Subsidiary Risks: 3 and 8; UN Pack Group: I 

STORAGE
Fireproof. Provision to contain effluent from fire extinguishing. Separated from strong oxidants and strong acids. Dry. Well closed. Keep in a well-ventilated room. Do NOT store or transport in containers made from plastic. Store in an area without drain or sewer access. 
PACKAGING
Unbreakable packaging.
Put breakable packaging into closed unbreakable container.
Do not transport with food and feedstuffs. 
1,1-DIMETHYLHYDRAZINE ICSC: 0147
PHYSICAL & CHEMICAL INFORMATION

Physical State; Appearance
COLOURLESS FUMING HYGROSCOPIC LIQUID WITH PUNGENT ODOUR. TURNS YELLOW ON EXPOSURE TO AIR. 

Physical dangers
The vapour is heavier than air and may travel along the ground; distant ignition possible. 

Chemical dangers
On combustion, forms toxic fumes including nitrogen oxides. The substance is a strong reducing agent. It reacts violently with oxidants. The substance is a strong base. It reacts violently with acid and is corrosive. Reacts with oxygen. This generates fire and explosion hazard. Attacks plastics. 

Formula: C2H8N2 / NH2-N(CH3)2
Molecular mass: 60.1
Boiling point: 64°C
Melting point: -58°C
Relative density (water = 1): 0.8
Solubility in water: very good
Vapour pressure, kPa at 20°C: 13.7
Relative vapour density (air = 1): 2.1
Relative density of the vapour/air-mixture at 20°C (air = 1): 1.2
Flash point: -15°C c.c.
Auto-ignition temperature: 249°C
Explosive limits, vol% in air: 2.4-20
Octanol/water partition coefficient as log Pow: -1.19
Viscosity: 0.6 mm²/s at 25°C 


EXPOSURE & HEALTH EFFECTS

Routes of exposure
The substance can be absorbed into the body by inhalation, through the skin and by ingestion. 

Effects of short-term exposure
The substance is substance irritating to the eyes, skin and respiratory tract. Inhalation of the vapour may cause lung oedema. See Notes. The substance may cause effects on the central nervous system and liver. 

Inhalation risk
A harmful contamination of the air can be reached very quickly on evaporation of this substance at 20°C. 

Effects of long-term or repeated exposure
The substance may have effects on the blood. This may result in anaemia. This substance is possibly carcinogenic to humans. 


Occupational exposure limits
TLV: 0.01 ppm as TWA; (skin); A3 (confirmed animal carcinogen with unknown relevance to humans).
MAK: skin absorption (H); sensitization of skin (SH); carcinogen category: 2 

ENVIRONMENT
The substance is toxic to aquatic organisms. It is strongly advised not to let the chemical enter into the environment. 

NOTES
Depending on the degree of exposure, periodic medical examination is suggested.
The symptoms of lung oedema often do not become manifest until a few hours have passed and they are aggravated by physical effort. Rest and medical observation are therefore essential.
Immediate administration of an appropriate inhalation therapy by a doctor or a person authorized by him/her, should be considered.
The odour warning when the exposure limit value is exceeded is insufficient.
Do NOT take working clothes home.
Rinse contaminated clothes with plenty of water because of fire hazard. 

ADDITIONAL INFORMATION
  EC Classification
Symbol: F, T, N; R: 45-11-23/25-34-51/53; S: 53-45-61; Note: E 

All rights reserved. The published material is being distributed without warranty of any kind, either expressed or implied. Neither ILO nor WHO nor the European Commission shall be responsible for the interpretation and use of the information contained in this material.
    See Also:
       Toxicological Abbreviations