Page 218 - Handbook of Hazardous Chemical Properties

208 HYDROGEN SULFIDE

Special Hazards of Combustion Products: Not pertinent; Behavior in Fire: May explode in fires;
Ignition Temperature : Not flammable; Electrical Hazard: Not pertinent; Burning Rate: Not flammable.
Chemical Reactivity - Reactivity with Water: No reaction; Reactivity with Common Materials: Dirt
and metals can cause rapid decomposition with the liberation of oxygen gas; Stability During Transport:
Pure grades are stable, but contamination by dirt and metals can cause rapid or violent decomposition;
Neutralizing Agents for Acids and Caustics: Not pertinent; Polymerization: Not pertinent; Inhibitor of
Polymerization: Not pertinent.

HYDROGEN SULFIDE
Chemical Designations - Synonyms: Sulfuretted hydrogen; Chemical Formula: H,S.
; (ii) Observable Characteristics - Physical State (as shipped): Liquid under pressure; Color:
Colorless; Odor: Offensive odor, like rotten eggs.
Physical and Chemical Properties - Physical State at 15 "c and 1 atm. : Gas; Molecular Weight:
34.08; Boiling Point at 1 atm.: -76.7, -60.4, 212.8; Freezing Point: -117, -82.8, 190.4; Critical
Temperature: 212.7, 100.4,373.6; Critical Pressure: 1300, 88.9, 9.01; Specific Gravity: 0.916 at -60
"C (liquid); Vapor (Gas) Specific Gravity: 1.2; Ratio of Specific Heats of Vapor (Gas): 1.322; Lutent
Heat of Vaporization: 234, 5.44; Heat of Combustion: -6552, -3640, -152.4; Heat of Decomposition:
Not pertinent.
Health Hazards Information - Recommended Personal Protective Equipment: Rubber-framed goggles;
approved respiratory protection; Symptoms Following Exposure: Irritation of eyes, nose and throat. If
high concentrations are inhaled, hyperpnea and respiratory paralysis may occur. Very high
concentrations may produce pulmonary edema; General Treatment for Exposure: INHALATION:
remove victim from exposure; if breathing has stopped, give artificial respiration; administer oxygen
if needed; consult physician. EYES: wash with plenty of water; Toxicity by Inhalation (Threshold Limit
Value): 10 ppm; Short-Term Inhalation Limits: 200 ppm for 10 min.; 100 ppm for 30 min. and 50 ppm
for 60 rnin.; Toxicity by Ingestion: Hydrogen sulfide is present as a gas at room temperature, so
ingestion not likely; 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: Minimum hazard. If spilled on clothing and
allowed to remain, may cause smarting and reddening of skin; Odor Threshold 0.0047 ppm.
Fire Hazards - Flash Point : This is a flammable gas; Flammable Limits in Air (A): 4.3 - 45; Fire
Extinguishing Agents: Stop the flow of gas; Fire Extinguishing Agents Not To Be Used: Not pertinent;
Special Hazards of Combustion Products: Toxic gases are generated in fires; Behavior in Fire: Vapor
is heavier than air and can travel to a source of ignition and flash back; Ignition Temperature (deg. F):
500; Electrical Hazard: Not pertinent; Bw'ng Rate: 2.3 dmin.
Chemical Reactivity - Reactivity with Water: No reaction; Reactivity with Common Materials: No
reactions; Stability During Transport: Stable; Neutralizing Agents for Acids and Caustics: Not pertinent;
Polymerization: Not pertinent; Inhibitor of Polymerization: Not pertinent.

HYDROQUINONE
Chemical Designations - Synonyms: 1 ,4-Benzenediol; p-Dihydroxybenzene; Hydroquinol; Pyrogentisic
acid; Quinol; Chemical Formula: 1 ,4-C6&(OH),.
Observable Characteristics -Physical State (as shipped): Solid; Color: Light tan to light gray; white;
Odor: None.
Physical and Chemical Properties - Physical State at 15 "c and I arm. : Solid; Molecular Weight:
110.11; Boiling Point at 1 atm.: 545,285, 558; Freezing Point: 338, 170,443; Critical Temperature:
Not pertinent; Critical Pressure: Not pertinent; Specific Gravity: 1.33 at 20 "C (solid); Vapor (Gas)
Specijic Gravity: Not pertinent; Ratio of Specific Heats of Vapor (Gas) : Not pertinent; Lutent Heat of
Vaporization: Not pertinent; Heat of Combustion: -1 1,200, -6,220, -260; Heat of Decomposition: Not
pertinent.
Health Hazards Information - Recommended Personal Protective Equipment: Goggles; respiratory
protection if dust is present; Symptoms Following Exposure: Ingestion can cause ringing in the ears,