Isopropenylbenzene

  • alpha-Methyl styrene
  • 1-Methyl-1-phenyl ethylene
  • (1-Methylethenyl)benzene
Formula
C6H5C(CH3)=CH2
Structure
Description
Colorless liquid with characteristic odor. Lachrymator.
Uses
Polymerization monomer, especially for polyesters.

Registry Numbers and Inventories.
CAS
98-83-9
EC (EINECS/ELINCS)
202-705-0
EC Index Number
601-027-00-6
EC Class
Flammable; Irritant; Dangerous for the Environment
R 10 36/37 51/53
RTECS
WL5075300
RTECS class
Tumorigen; Mutagen; Human Data; Primary Irritant
UN (DOT)
2303
Beilstein/Gmelin
969405
Beilstein Reference
4-05-00-01364
Swiss Giftliste 1
G-2534
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C9H10
Formula mass
118.18
Melting point, °C
-23
Boiling point, °C
165.4
Vapor pressure, mmHg
2.8 (25 C)
Vapor density (air=1)
4.08
Saturation Concentration
3026 ppm (0.3%) at 20 C (calculated)
Odor Threshold Odor threshold 52 ppb
Critical temperature
371.9
Critical pressure
3.5
Density
0.9108 g/cm3 (20 C)
Solubility in water
Insoluble
Viscosity
0.940 cp at 20C
Surface tension
32.40 g/s2 at 20 C
Refractive index
1.5386 (20C)
Partition coefficient, pKow
3.48
Heat of vaporization
38.3 kJ/mol
Heat of combustion
-5087 kJ/mol

Hazards and Protection.
Storage
Keep away from heat, sparks, and flame. Keep away from sources of ignition. Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances. Flammables-area.
Handling
Ground and bond containers when transferring material. Use spark-proof tools and explosion proof equipment. Empty containers retain product residue, (liquid and/or vapor), and can be dangerous. Avoid contact with heat, sparks and flame. 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.
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
40
Autoignition, °C
445
Upper exp. limit, %
6.6
Lower exp. limit, %
0.9
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Will burn if involved in a fire. 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. Use agent most appropriate to extinguish fire. Do NOT use straight streams of water.
Fire potential
HIGHLY FLAMMABLE.
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. May polymerize explosively when heated or involved in a fire. Runoff to sewer may create fire or explosion hazard. Containers may explode when heated. Many liquids are lighter than water. Substance may be transported hot.
Combustion products
When heated to decomposition, it emits acrid smoke and fumes.
Health
2
 
Flammability
2
 
 
Reactivity
0
 

Health.
Exposure limit(s)
NIOSH REL: TWA 50 ppm (240 mg/m3) ST 100 ppm (485 mg/m3) OSHA PEL: C 100 ppm (480 mg/m3) IDLH 700 ppm
Poison_Class
3
Exposure effects
Effects may be delayed.
   Ingestion
May cause gastrointestinal irritation with nausea, vomiting and diarrhea. Ingestion of large amounts may cause CNS depression.
   Inhalation
Causes respiratory tract irritation. Aspiration may lead to pulmonary edema. Vapors may cause dizziness or suffocation. May cause burning sensation in the chest.
   Skin
May cause irritation and dermatitis. May cause cyanosis of the extremities.
   Eyes
Causes eye irritation. Lachrymator. May cause chemical conjunctivitis and corneal damage.

First aid
 
   Ingestion
Do NOT induce vomiting. Never give anything by mouth to an unconscious person. Get medical aid immediately. Do NOT induce vomiting. If conscious and alert, rinse mouth and drink 2-4 cupfuls of milk or water.
   Inhalation
Get medical aid immediately. Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. DO NOT use mouth-to-mouth respiration.
   Skin
Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.
   Eyes
Immediately 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
2303
Response guide
Hazard class
3
Packing Group
III
 
USCG CHRIS Code
MSR
 
HS Code
2902 90 80
 
Std. Transport #
4912631
 
IMO Chemical Code
17
IMO Pollution Category
A
IMO Hazard code
S/P