Page 275 - Handbook of Hazardous Chemical Properties

METHYLPARATHION 265

Vaporization: 140,77, 3.2; Heat of Combustion: (est.) -11,400, -6,310, -264; Heat ofDecomposition:
Not pertinent.
Health Hazards Information - Recommended Personal Protective Equipment: Air mask; plastic
gloves; goggles; Symptoms Following Erposure: Irritation of eyes, nose, and throat. Nausea and
vomiting. Liquid may cause skin irritation; General Treament for Exposure: INHALATION: remove
to fresh air; apply artificial respiration and oxygen if needed; refer to physician. SKIN OR EYES: flush
with plenty of water for 15 min.; refer to physician for eye exposure; Toxicity by Inhalation (Threshold
Limit Value): 100 ppm; Short-Tern Inhalation Limits: Data not available; Toxicity by Ingestion: Grade
1; LD, 5 to 15 glkg (rat); Late Toxicity: Data not available; Vapor (Gas) Irritant Characteristics:
Vapor is moderately irritating such that personnel will not usually tolerate moderate or high vapor
concentrations; Liquid or Solid Irritant Characteristics: Causes smarting of the skin and first-degree
burns on short exposure; may cause secondary burns on long exposure; Odor l'kreshold Data not
available.
Fire Hazards - Flash Point (deg. F): 50 OC; Flammuble Limits in Air (a): 2.1 - 12.5; Fire
Extinguishing Agents: Foam, carbon dioxide, dry chemical; Fire Extinguishing Agents Not To Be Used:
Water may be ineffective; Special Hazards of Combustion Products: Not pertinent; Behavior in Fire:
Vapor is heavier than air and may travel a considerable distance to a source of ignition and flash back.
Containers may explode in fire or when heated because of polymerization; Ignition Temperature (deg.
F): 790; Electrical Hazard: Not pertinent; Burning Rate: 2.5 mm/min.
Chemical Reactivity - Reactivity with Water: No reaction; Reactivity with Common Materials: No
reaction; Stability During Transport: Stable; Neutralizing Agents for Acids and Caustics: Not pertinent;
Polymerization: Heat, oxidizing agents, and ultraviolet light may cause polymerization; Inhibitor of
Polymerization: Hydroquinone, 22 - 65 ppm; hydroquinone methyl ether, 22 - 120 ppm; dimethyl tert-
butylphenol, 45 - 65 ppm.

METHYL PARATHION
Chemical Designations - Synonyms: MPT; 0,O-Dimethyl 0-@-Nitrophenyl) Phosphorothiorate; 0,O-
Dimethyl 0-p-Nitrophenyl thiophosphate; Parathion-methyl; chemical Formula: (CH,O),PSOC&NO,-
P.
Observable Characteristics - Physical State (as shipped): Solid or liquid; Color: Colorless solid or
brownish liquid; Odor: Characteristic; like rotten eggs or garlic.
Physical and Chemical Properties - Physical State at 15 "c and I atm. : Liquid or solid; Molecular
Weight: 263.2; Boiling Point at I atrn. : Very higk Freezing Point: 65, 18,291; Critical Temperature:
Not pertinent; Critical Pressure: Not pertinent; Specific Gravity: 1.360 at 20 "C (liquid); Vapor (Gas)
Specific Gravity: Not pertinent; Ratio of Specific Heats of Vapor (Gas): Not pertinent; Latent Heat of
Vaporization: Not pertinent; Heat of Combustion: Data not available; Heat of Decomposition: Not
pertinent.
Health Hazards Information - Recommended Personal Protective Equipment: Approved mask or
respirator; natural rubber gloves, overshoes; protective clothing; goggles; Symptoms Following
Exposure: Exposure to fumes from a fire, or to the liquid, causes headache, blurred vision, constricted
pupils of the eyes, weakness, nausea, cramps, diarrhea, and tightness in the chest. Muscle twitch and
convulsions may follow. Symptoms may develop over a period of 8 hrs; General Treatment for
Exposure: Speed is essential. INGESTION: call a doctor! If victim is not breathing, immediately
institute artificial respiration by mouth-to-mouth, mouth-to-nose, or mouth-to-oropharyngeal method;
when victim is conscious, give milk, water, or salt-water and induce vomiting repeatedly. SKIN OR
EYES: flood and wash exposed areas thoroughly with water; remove contaminated clothing under a
shower; Toxicity by Inhalation Freshold Limit Value): 0.2 mglm3 (solid); 100 ppm (liquid); Short-
Term Inhalation Limits: Data not available; Toxicity by Ingestion: Grade 4; LD,, below 50 mglkg (rat);
Late Toxicity: Data not available; Vapor (Gas) Irritant Characteristics: Not pertinent; Liquid or Solid
Irritant Characteristics: Poisonous when absorbed thorough skin; Odor l'kreshold Data not available.
Fire EIazards - Flash Point (deg. F): 115 OC; Flammable Limits in Air (%): Data not available; Fire