1-Methylhydrazine

  • Monomethylhydrazine
  • MMH
  • Methylhydrazine
  • Hydrazomethane
Formula
CH3NHNH2
Structure
Description
A colorless liquid with an ammonia-like odor.
Uses
Solvent.

Registry Numbers and Inventories.
CAS
60-34-4
EC (EINECS/ELINCS)
200-471-4
RTECS
MV5600000
RTECS class
Tumorigen; Mutagen; Reproductive Effector
UN (DOT)
1244
Merck
12,6160
Beilstein/Gmelin
635645
Beilstein Reference
4-04-00-03322
RCRA
P068
Swiss Giftliste 1
G-2465
Canada DSL/NDSL
NDSL
US TSCA
Listed
Austrailia AICS
Listed
Japan ENCS (MITI)
Listed

Properties.
Formula
CH6N2
Formula mass
46.07
Boiling point, °C
87.8
Vapor pressure, mmHg
64 (25 C)
Vapor density (air=1)
1.6
Odor Threshold Odor threshold 1.75 mg/m3
Critical temperature
312
Critical pressure
81.3
Density
0.8632 g/cm3 (30 C)
Solubility in water
Miscible
Surface tension
34.3 g/s2
Refractive index
1.433 (20 C)
pKa/pKb
4.97 (pKb)
Partition coefficient, pKow
-1.05
Heat of fusion
10.4 kJ/mol
Heat of vaporization
36.1 kJ/mol
Heat of combustion
-1170 kJ/mol

Hazards and Protection.
Storage
Keep away from heat, sparks, and flame. Keep away from sources of ignition. Store in a cool, dry, well-ventilated area away from incompatible substances. Flammables-area. Keep containers tightly closed.
Handling
Use only in a well ventilated area. Ground and bond containers when transferring material. Avoid contact with eyes, skin, and clothing. Do not breathe dust, vapor, mist, or gas. Do not get in eyes, on skin, or on clothing. Empty containers retain product residue, (liquid and/or vapor), and can be dangerous. Avoid contact with heat, sparks and flame. Do not ingest or inhale. Do not pressurize, cut, weld, braze, solder, drill, grind, or expose empty containers to heat, sparks or open flames.
Protection
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators
Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
Small spills/leaks
Absorb spill with inert material, (e.g., dry sand or earth), then place into a chemical waste container. Avoid runoff into storm sewers and ditches which lead to waterways. Scoop up with a nonsparking tool, then place into a suitable container for disposal. Remove all sources of ignition. Provide ventilation. A vapor suppressing foam may be used to reduce vapors. Use water spray to reduce vapors or divert vapor cloud drift.
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Oxidizing agents - oxygen - peroxides.
Decomposition
Nitrogen oxides, carbon monoxide, carbon dioxide, nitrogen.

Fire.
Flash Point,°C
21
Autoignition, °C
194
Upper exp. limit, %
92
Lower exp. limit, %
2.5
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Liquid will float and may reignite on the surface of water. Containers may explode when heated. To extinguish fire, use water, dry chemical, chemical foam, or alcohol-resistant foam. Water may be ineffective. Do NOT use straight streams of water. Cool containers with flooding quantities of water until well after fire is out.
Fire potential
HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames.
Hazards
Extremely flammable; ignites spontaneously under almost all normal temperature conditions. The vapor is heavier than air; thus it may accumulate sufficiently to flash back. Methylhydrazine fires produce irritating nitrogen oxides. Ignites spontaneously in air when in contact with porous materials (e.g., earth, asbestos, wood, or cloth). Also ignites spontaneously on contact with strong oxidizing agents (e.g., fluorine, chlorine trifluoride, fuming nitric acid, and nitrogen tetroxide). Heat or flame should be avoided because chemical is extremely flammable and explosive.
Combustion products
Toxic oxides of nitrogen are produced during combustion of this material.
Health
4
 
Flammability
3
 
 
Reactivity
2
 

Health.
Exposure limit(s)
OSHA PEL: C 0.2 ppm (0.35 mg/m3) skin NIOSH REL: Ca C 0.04 ppm (0.08 mg/m3) 2-hr See Appendix A NIOSH IDLH: Potential occupational carcinogen 20 ppm
Carcinogin
G-A3, CP65
Poison_Class
2
Exposure effects
Anoxia, cyanosis, or fever may occur. Respiratory arrest may occur secondary to seizure activity or coma. CNS stimulation, excitability, tremors, convulsions, and coma have occurred. Contradictory results have been obtained for induction of malformations in mice. Sperm head abnormalities were reversibly induced in rats. Methemoglobin inducers may be especially hazardous to the fetus.
   Ingestion
May be fatal if swallowed. May cause digestive tract disturbances.
   Inhalation
May be fatal if inhaled. Causes severe irritation of upper respiratory tract with coughing, burns, breathing difficulty, and possible coma. Exposure may cause coughing, breathing difficulty, and possible pulmonary edema.
   Skin
May be fatal if absorbed through the skin. May cause skin burns.
   Eyes
Causes eye irritation and possible burns.

First aid
 
   Ingestion
If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately.
   Inhalation
Get medical aid immediately. Remove from exposure to fresh air immediately. If breathing is difficult, give oxygen. If breathing has ceased apply artificial respiration using oxygen and a suitable mechanical device such as a bag and a mask.
   Skin
Get medical aid immediately. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.
   Eyes
Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.

Transport.
UN number
1244
Response guide
Hazard class
6.1
PRTC
T
Packing Group
I
 
USCG CHRIS Code
MHZ
 
Std. Transport #
4927011