Page 271 - Handbook of Hazardous Chemical Properties

METHYLHYDRAZINE 261
(liquid); Vapor (Gas) Specijic Gravity: 2.07; Ratio of Specijic Heats of Vapor (Gas): 1.1446; Latent
Heat of Vaporization: 202, 112, 4.696; Heat of Combustion: -6,980, -3,880, -162; Heat of
Decomposition: Not pertinent.
Health Hazards Information - Recommended Personal Protective Equipment: Goggles or safety
glasses; self-contained breathing apparatus; rubber gloves; Symptoms Following Exposure: Inhalation
causes irritation of mucous membranes. Prolonged inhalation can produce narcosis and central nervous
symptoms, including some temporary visual disturbance. Contact with liquid irritates eyes and may
irritate skin if allowed to remain. Ingestion causes irritation of mouth and stomach and central nervous
system depression, including visual disturbances; General Treatment for Exposure: INHALATION:
remove to fresh air and rest; if pulmonary edema develops, administer oxygen; call physician. EYES:
irrigate with water for 15 min SKIN: wash thoroughly with soap and water. INGESTION: do NOT
induce vomiting; get medical attention; Toxicity by Inhalation (ThresholdLimit Value): 100 ppm; Short-
Term Inhulation Limits: Data not available; Toxicity by Ingestion: Grade 1; LD,, 5 to 15 glkg; Late
Toxicity: Data not available; Vapor (Gas) Irritant Characteristics: Vapors are moderately irritating such
that personnel will not usually tolerate moderate or high concentrations; Liquid or Solid Irritant
Characteristics: Minimum hazard. If spilled on clothing and allowed to remain, may cause smarting
and reddening of skin; Odor Threshold Data not available.
Fire Hazards - Flash Point (deg. F): - 26 CC; Flammable Limits in Air (%): 5 - 22.7; Fire
Extinguishing Agents: Dry chemical, carbon dioxide, alcohol foam; Fire Extinguishing Agents Not To
Be Used: Water may be ineffective; Special Hazard of Combustion Products: Not pertinent; Behavior
in Fire: Vapor is heavier than air and may travel a considerable distance to source of ignition and flash
back; Ignition Temperahue (deg. F): 853; Electrical Hazard: Data not available; Burning Rate: 2.5
mmlmin.
Chemical Reactivity -Reactivity with Water: Slow reaction to form formic acid and methyl alcohol;
reaction is not hazardous; Reactivity with Common Materials: No reaction; Stability During Transport:
Stable; Neutralizing Agents for Acids and Caustics: Not pertinent; Polymerization: Not pertinent;
Inhibitor of Polymerization: Not pertinent.
METHYLHYDRAZINE
Chemical Designations - Synonyms: Monomethylhydrazine; MMH; Chemical Formula: CH,NHNH2.
Observable Characteristics - Physical State (as shipped) : Liquid; Color: Colorless; Odor: Like
ammonia.
Physical and Chemical Properties - Physical State at 15 "c and I am. : Liquid; Molecular Weight:
46.1; Boiling Point at 1 atm.: 189.5, 87.5, 360.7; Freezing Point: -62.3, -52.4, 220.8; Critical
Temperature: 594, 312, 585; Critical Pressure: 1,195, 81.3, 8.25; Specijic Gravity: 0.878 at 20 "C
(liquid); Vapor (Gas) Specijic Gravity: 1.59; Ratio of Specijic Heats of Vapor (Gas): 1.1326; Latent
Heat of Vaporization: 376, 209, 8.75; Heat of Combustion: -12,178, -6,766, -283.1; Heat of
Decomposition: Not pertinent.
Health Hazards Information -Recommended Personal Protective Equipment: Organic canister mask
or self-contained breathing apparatus; goggles or face shield; rubber gloves; protective clothing;
Symptoms Following Exposure: Tremors and convulsions follow absorption by any route. Inhalation
causes local irritation of respiratory tract, respiratory distress, and systemic effects. Contact of liquid
with eyes or skin causes irritation and burns. Ingestion causes irritation of mouth and stomach; General
Treatment for Exposure: Get medical attention at once following all exposures to this compound.
INHALATION: move victim to fresh air and keep him quiet; give artificial respiration if breathing
stops. EYES: flush with large quantities of water for at least 15 minutes. SKIN: immediately flush with
large quantities of water and treat as for alkali bum. INGESTION: give egg whites or other emollient,
followed by a 5% salt solution or other mild emetic. Keep patient as quiet as possible. To control
convulsions, short-acting barbiturates may be administered parenterally by a physician with due regard
for depression of respiration; Toxicity by Inhulation (Threshold Limit Value): 0.2 ppm; Short-Term
Inhalation Limits: 90 ppm for 10 min.; 30 ppm for 30 min.; 15 ppm for 60 min.; Toxicity by Ingestion:
Grade 4, oral LD,, = 33 mglkg (rat); Late Toxicity: Hemolytic anemia may result from large doses