Page 225 - Handbook of Hazardous Chemical Properties

ISOBUTYRIC ACID 215

fires; Behavior in Fire: Vapor is heavier than air and may travel to source of ignition and flash back.
Containers may explode; Ignition Temperature (deg. F): 712; Electrical Hazard: No data; Burning
Rate: 6.0 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: Not pertinent; Inhibitor of Polymerization: Not pertinent.
ISOBUTYLENE
Chemical Designations - Synonyms: Isobutene; 2-Methylpropene; Chemical Formula: (CH,),C = CH,,
Observable Characteristics - Physical State (as shipped) : Liquid under pressure; Color: Colorless;
Odor: Mild and sweet.
Physical and Chemical Properties - Physical State at 15 "c and 1 atm.: Gas; Molecular Weight:
56.10; Boiling Point at 1 atm.: 19.6, -6.9, 266.3; Freezing Point: -220, -140.3, 132.9; Critical
Temperature: 292.5, 144.7, 417.9; Critical Pressure: 580, 39.48, 3.99; Specijk Gravity: 0.59 at 20
"C (liquid); Vapor (Gas) Specijic Gravity: 1.9; Ratio of Specijic Heats of Vapor (Gas): 1.061; Latent
Heat of Vaporization: 170, 94.3, 3.95; Heat of Combustion: -19,359, -10,755, -450.29; Heat of
Decomposition: Not pertinent.
Health Hazards Information - Recommended Personal Protective Equipment: Chemical gloves and
eye protection; organic vapor canister or self-contained breathing apparatus; Symptoms Following
fiposure: Inhalation of moderate concentrations causes dizziness, drowsiness, and unconsciousness.
Contact with eyes or skin may cause irritation; the liquid may cause frostbite; General Treatment for
Exposure: INHALATION: remove victim to fresh air and apply resuscitation; call a physician promptly
if victim is unconscious. EYES: if irritated, wash with water. SKIN: if irritated, wash with soap and
water; Toxicity by Inhalation (Threshold Limit Value): IO00 ppm (8 hr); Short-Tern Inhalation Limits:
Data not available; Toxicity by Ingestion: Not pertinent; Late Toxicity: None; Vapor (Gas) Im'tant
Characteristics: Vapors are non-irritating to eyes and throat; Liquid or Solid Irritant Characteristics:
No appreciable hazard. Practically harmless to the skin because it is very volatile and evaporates
quickly. May cause frostbite; Odor i%reshold Data not available.
Fire Hazards - Flash Point (deg. F): -105 CC; Flmmble Limits in Air (%): 1.8 - 9.6; Fire
Extinguishing Agents: Recommended to allow fire to burn. Stop the flow of gas if feasible. Water fog,
dry chemical, or carbon dioxide may be used on small firs; Fire Extinguishing Agents Not To Be Used:
Not pertinent; Special Hazards of Combustion Products: Not pertinent; Behavior in Fire: Containers
may explode in fires. Vapors are heavier than air and can travel to source of ignition and flash back;
Ignition Temperature (deg. F): 869; Electrical Hazard: Not pertinent; Burning Rate: No data.
Chemical Reactivity - Reactivity with Water: No reaction; Reactivity with Common Materials: No
reactions; Stability During Transport: Stable; Neutralizing Agents forAcids and Caustics: Not pertinent;
Polymerization: Not pertinent; Inhibitor of Polymerization: Not pertinent.

ISOBUTYRIC ACID
Chemical Designation - Synonyms: Dimethylacetic acid; Isopropylformic acid; 2-Methylpropanoic
acid; alpha-Methylpropionic acid; Propane-2-carboxylic acid; Chemical Formula: (CH,),CHCOOH.
Observable Characteristics - Physical State (as shipped) : Liquid; Color: Colorless; Odor: Unpleasant,
acrid.
Physical and Chemical Properties - Physical State at 15 "c and 1 atm. : Liquid; Molecular Weight:
88; Boiling Point at 1 atm.: 309, 154, 427; Freezing Point: -51, -46, 227; Critical Temperature: 637,
336, 609; Critical Pressure: 588, 40, 4.06; Specqc Gravity: 0.949 at 20 "C (liquid); Vapor (Gas)
Specific Gravity: 3.0; Ratio of Specijic Heats of Vapor (Gas): Not pertinent; Latent Heat of
Vaporization: 202, 112,4.68; Heat of Combzution: -10,600, -5,880, -246; Heat ofDecomposition: Not
pertinent.
Health Hazards Information - Recommended Personal Protective Equipment: Organic chemical
respirator; goggles or face shield; rubber gloves; Symptoms Following Exposure: Inhalation causes
irritation of nose and throat. Ingestion causes irritation of mouth and stomach. Contact with eyes or skin