1,4-Pentadiene

  • Penta-1,4-diene
Formula
C5H8
Structure
Description
A colorless liquid.

Registry Numbers and Inventories.
CAS
591-93-5
EC (EINECS/ELINCS)
209-736-9
R 12 65
S 16 23 33 62
UN (DOT)
1993
Beilstein/Gmelin
1696934
Beilstein Reference
4-01-00-00998
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C5H8
Formula mass
68.12
Melting point, °C
-148.3
Boiling point, °C
26
Vapor pressure, mmHg
657 (25 C)
Vapor density (air=1)
2.35
Critical temperature
187
Critical pressure
37
Density
0.6608 g/cm3 (20 C)
Solubility in water
Slightly soluble
Refractive index
1.3888 (20 C)
Partition coefficient, pKow
2.39
Heat of fusion
6.15 kJ/mol
Heat of vaporization
26.4 kJ/mol
Heat of combustion
-3219 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. Refrigerator/flammables. Keep containers tightly closed.
Handling
Wash thoroughly after handling. Use with adequate ventilation. Ground and bond containers when transferring material. Avoid contact with eyes, skin, and clothing. Empty containers retain product residue, (liquid and/or vapor), and can be dangerous. Avoid contact with heat, sparks and flame. Avoid ingestion and inhalation. 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. Clean up spills immediately, using the appropriate protective equipment. Remove all sources of ignition. Use a spark-proof tool. Provide ventilation. A vapor suppressing foam may be used to reduce vapors. Water spray may reduce vapor but may not prevent ignition in closed spaces.
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Oxidizing agents
Decomposition
Carbon monoxide, irritating and toxic fumes and gases, carbon dioxide.

Fire.
Flash Point,°C
4
Upper exp. limit, %
13.1
Lower exp. limit, %
1.6
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Use water spray to keep fire-exposed containers cool. Containers may explode in the heat of a fire. Extinguishing media: For small fires, use dry chemical, carbon dioxide, water spray or alcohol-resistant foam. For large fires, use water spray, fog, or alcohol-resistant foam. Use water spray to cool fire-exposed containers. 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
Extremely flammable.
Hazards
Fire may produce irritating and poisonous gases. Behavior in Fire: Flammable vapor may spread away from spill. Container may explode in heat of fire. Vapor explosion hazard indoors, outdoors or sewers. Runoff to sewer may create fire or explosion hazard. Fire may generate toxic and irritating gases.
Combustion products
Fire may produce irritating and poisonous gases.
Health
1
 
Flammability
4
 
 
Reactivity
0
 

Health.
Exposure effects
The toxicological properties of this substance have not been fully investigated.
   Ingestion
May cause digestive tract disturbances. The toxicological properties of this substance have not been fully investigated.
   Inhalation
Causes respiratory tract irritation. Vapors may cause dizziness or suffocation.
   Skin
Causes skin irritation.
   Eyes
Causes eye irritation.

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
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
   Skin
Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Remove 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
1993
Response guide
Hazard class
3
Packing Group
I; II; III
 
USCG CHRIS Code
PDN