Ethylidene norbornene

  • 5-Ethylidene-2-norbornene
  • 5-Ethylidenebicyclo[2.2.1]hep-2-ene
  • ENB
  • 5-Ethylidene-8,9,10-Trinorborn-2-ene
Formula
C9H12
Structure
Description
Colorless liquid with an odor of turpentine. A mixture of endo and exo isomers.
Uses
As third monomer in epdm (ethylene-propylene diene monomer) elastomers.

Registry Numbers and Inventories.
CAS
16219-75-3
EC (EINECS/ELINCS)
240-347-7
S 9 16 33
RTECS
RB9450000
RTECS class
Reproductive Effector; Human Data; Primary Irritant
UN (DOT)
1993
Beilstein/Gmelin
2039935
Beilstein Reference
6-05
Swiss Giftliste 1
G-4690
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C9H12
Formula mass
120.21
Melting point, °C
-80
Boiling point, °C
146
Vapor pressure, mmHg
4.6 (20 C)
Vapor density (air=1)
4.14
Odor Threshold Odor threshold 0.014 ppm
Density
0.896 g/cm3 (20 C)
Solubility in water
Insoluble
Refractive index
1.4912 (20 C)
Partition coefficient, pKow
3.38
Heat of vaporization
36.7 kJ/mol
Heat of combustion
-5250 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. Store under nitrogen.
B2 D1A D2B
Handling
Ground and bond containers when transferring material. Use spark-proof tools and explosion proof equipment. Avoid contact with eyes, skin, and clothing. Empty containers retain product residue, (liquid and/or vapor), and can be dangerous. Keep container tightly closed. Avoid contact with heat, sparks and flame. Avoid ingestion and inhalation. Use with adequate ventilation. Wash clothing before reuse. 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
A respiratory protection program that meets OSHA's 29 CFR 1910.134 and ANSI Z88.2 requirements or European Standard EN 149 must be followed whenever workplace conditions warrant a respirator's use.
Small spills/leaks
Absorb spill with inert material, (e.g., dry sand or earth), then place into a chemical waste container. 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.
Stability
May react with oxygen in the air.
Incompatibilities
Oxygen, strong oxidizing agents.
Decomposition
Carbon monoxide, carbon dioxide.

Fire.
Flash Point,°C
38
Upper exp. limit, %
6.4
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. Use water spray to cool fire-exposed containers. Water may be ineffective in extinguishing fire. Do NOT use straight streams of water. In case of fire, use carbon dioxide, dry chemical powder or appropriate foam.
Fire potential
Flammable liquid and vapor.
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
2
 
Flammability
2
 
 
Reactivity
0
 

Health.
Exposure limit(s)
TLV: 5 ppm; 25 mg/m3 (as CEILING) (ACGIH 1991-1992). NIOSH REL: C 5 ppm (25 mg/m3)
Poison_Class
4
Exposure effects
   Ingestion
Causes gastrointestinal irritation with nausea, vomiting and diarrhea.
   Inhalation
Vapors may cause dizziness or suffocation. Inhalation of vapors will cause coughing or breathing difficulty. Aspiration may cause severe pneumonia.
   Skin
Causes mild skin irritation.
   Eyes
Causes mild eye irritation. Contact may cause transient eye irritation. This product rated 1 on rabbit eyes (Toxicology of the Eye).

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
Get medical aid immediately. Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen.
   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
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
ENB
 
IMO Chemical Code
17
IMO Pollution Category
B
IMO Hazard code
S/P