Methylstyrene, mixed isomers

  • Benzene, ethenyl-, monomethyl derivative
Formula
3 or 4-(CH3)C6H4CH=CH2
Structure
Description
Clear, colorless liquid.
Uses
This is a high volume chemical with production exceeding 1 million pounds annually in the U.S.

Registry Numbers and Inventories.
CAS
1319-73-9
EC (EINECS/ELINCS)
215-292-7
EC Class
flammable, harmful, irritant, dangerous for the environment
R 10 20 36/37/38 52/53
UN (DOT)
3295
Beilstein/Gmelin
NA
New Zealand
Listed
Japan ENCS (MITI)
Listed

Properties.
Formula
C9H10
Formula mass
118.18
Melting point, °C
-77
Boiling point, °C
168
Vapor pressure, mmHg
11 (20 C)
Vapor density (air=1)
4.08
Density
0.893 g/cm3 (25 C)
Solubility in water
Insoluble

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.
B3 D2B
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
Make no contact with the spilled material. ELIMINATE all ignition sources and ground all equipment. Stop leak if you can do it without risk. A vapor suppressing foam may be used to reduce vapors. Absorb or cover with dry earth, sand or other non-combustible material and transfer to containers. Use clean non-sparking tools to collect absorbed material.
Disposal code
1
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Strong oxidizing agents.
Decomposition
Carbon monoxide, irritating and toxic fumes and gases, carbon dioxide.

Fire.
Flash Point,°C
52
Autoignition, °C
575
Upper exp. limit, %
5.2
Lower exp. limit, %
0.9
Fire fighting
Use of water spray when fighting fire may be inefficient. Small Fires: Dry chemical, carbon dioxide, water spray or alcohol-resistant foam. Large Fires: Water spray, fog or alcohol-resistant foam. Use water spray or fog; do not use straight streams.
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
1
 
Flammability
2
 
 
Reactivity
1
 

Health.
Poison_Class
3 (Strong toxins)
Exposure effects
The toxological properties of this substance have not been fully investigated.
   Ingestion
May cause gastrointestinal irritation with nausea, vomiting and diarrhea. Ingestion of large amounts may cause CNS depression.
   Inhalation
Causes respiratory tract irritation. Vapors may cause dizziness or suffocation. Can produce delayed pulmonary edema. May cause burning sensation in the chest.
   Skin
May cause irritation and dermatitis. May cause cyanosis of the extremities.
   Eyes
Causes eye irritation. May cause chemical conjunctivitis and corneal damage.

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
 
HS Code
2902 90 80