Methylcyclopentadiene

  • Methyl-1,3-cyclopentadiene
  • Monomethylcyclopentadiene
Formula
C6H8
Structure
Description
A pale yellow liquid or crystalline solid.

Registry Numbers and Inventories.
CAS
26519-91-5
EC (EINECS/ELINCS)
247-757-5
RTECS
GY1500000
RTECS class
Other
UN (DOT)
3295
Beilstein/Gmelin
141720 (G)
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed

Properties.
Formula
C6H8
Formula mass
80.14
Melting point, °C
-87
Boiling point, °C
92
Critical temperature
297
Critical pressure
42.5
Partition coefficient, pKow
1.62

Hazards and Protection.
Storage
Keep in a cool, dry, dark location in a tightly sealed container or cylinder. Keep away from incompatible materials, ignition sources and untrained individuals. Secure and label area. Protect containers/cylinders from physical damage.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Wear appropriate protective gloves, clothing and goggles.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Keep sparks, flames, and other sources of ignition away. Keep material out of water sources and sewers. Build dikes to contain flow as necessary. Attempt to stop leak if without undue personnel hazard. Use water spray to knock-down vapors. Land spill: Dig a pit, pond, lagoon, holding area to contain liquid or solid material. Dike surface flow using soil, sand bags, foamed polyurethane, or foamed concrete. Water spill: Use natural barriers or oil spill control booms to limit spill travel. Remove trapped material with suction hoses.
Stability
No data.
Incompatibilities
May react vigorously with strong oxidizing agents Can react exothermically with reducing agents to release gaseous hydrogen.

Fire.
Flash Point,°C
49
Autoignition, °C
446
Upper exp. limit, %
7.6
Lower exp. limit, %
1.3
Fire fighting
Use water in flooding quantities as fog. Use alcohol foam, dry chemical or carbon dioxide. Keep run-off water out of sewers and water sources. Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible.
Fire potential
HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames.
Hazards
Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion hazard indoors, outdoors or in sewers.
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.

Health.
Exposure effects
The toxological properties of this substance have not been fully investigated.
   Inhalation
Vapors may cause dizziness or suffocation. May cause irritation or burns.
   Skin
May cause irritation or burns.
   Eyes
See Skin.

First aid
 
   Ingestion
Seek medical assistance.
   Inhalation
Move victim to fresh air. Apply artificial respiration if victim is not breathing. Administer oxygen if breathing is difficult.
   Skin
Remove and isolate contaminated clothing and shoes. Wash skin with soap and water. Flush with running water for at least 20 minutes
   Eyes
Flush with running water for at least 20 minutes.

Transport.
UN number
3295
Response guide
Hazard class
3
Packing Group
I; II; III
 
USCG CHRIS Code
HFN
 
Std. Transport #
4910209