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CHLOROPRENEICSC: 0133
2-Chloro-1,3-butadiene
2-Chlorobutadiene
beta-Chloroprene
April 2009
CAS #: 126-99-8
UN #: 1991 (inhibited)
EC Number: 204-818-0

  ACUTE HAZARDS PREVENTION FIRE FIGHTING
FIRE & EXPLOSION Highly flammable. Many reactions may cause fire or explosion. Gives off irritating or toxic fumes (or gases) in a fire.  Vapour/air mixtures are explosive.  NO open flames, NO sparks and NO smoking.  Closed system, ventilation, explosion-proof electrical equipment and lighting. Prevent build-up of electrostatic charges (e.g., by grounding). Use non-sparking handtools.  Use powder, water spray, foam, carbon dioxide.  In case of fire: keep drums, etc., cool by spraying with water. 

 STRICT HYGIENE! IN ALL CASES CONSULT A DOCTOR! 
  SYMPTOMS PREVENTION FIRST AID
Inhalation Cough. Sore throat. Headache. Dizziness. Drowsiness. Laboured breathing. Heart palpitations. Unconsciousness.  Use ventilation, local exhaust or breathing protection.  Fresh air, rest. Half-upright position. Refer immediately for medical attention. 
Skin MAY BE ABSORBED! Redness. Pain. Burning sensation. See Inhalation.  Protective gloves. Protective clothing.  Remove contaminated clothes. Rinse and then wash skin with water and soap. Refer immediately for medical attention. 
Eyes Redness. Pain. Corneal damage.  Wear safety goggles, face shield or eye protection in combination with breathing protection.  Rinse with plenty of water (remove contact lenses if easily possible). Refer for medical attention. 
Ingestion See Inhalation.  Do not eat, drink, or smoke during work.  Rinse mouth. Do NOT induce vomiting. Refer immediately for medical attention. 

SPILLAGE DISPOSAL CLASSIFICATION & LABELLING
Remove all ignition sources. Evacuate danger area! Consult an expert! Personal protection: complete protective clothing including self-contained breathing apparatus. Ventilation. Collect leaking liquid in sealable containers. Absorb remaining liquid in sand or inert absorbent. Then store and dispose of according to local regulations. Do NOT wash away into sewer. 

According to UN GHS Criteria

flam;flameskull;toxiccancer;health haz
DANGER
Highly flammable liquid and vapour
Toxic if swallowed
Causes skin irritation
Causes serious eye irritation
Suspected of causing cancer
Causes damage to organs
May cause damage to organs through prolonged or repeated exposure 

Transportation
UN Classification
UN Hazard Class: 3; UN Subsidiary Risks: 6.1; UN Pack Group: I 

STORAGE
Fireproof. Separated from food and feedstuffs and incompatible materials. See Chemical Dangers. Cool. Keep in the dark. Well closed. Store only if stabilized. Store in an area without drain or sewer access. 
PACKAGING
Airtight.
Unbreakable packaging.
Put breakable packaging into closed unbreakable container.
Do not transport with food and feedstuffs. 
CHLOROPRENE ICSC: 0133
PHYSICAL & CHEMICAL INFORMATION

Physical State; Appearance
COLOURLESS LIQUID WITH PUNGENT ODOUR. 

Physical dangers
The vapour is heavier than air and may travel along the ground; distant ignition possible. As a result of flow, agitation, etc., electrostatic charges can be generated. 

Chemical dangers
The substance can readily form explosive peroxides under specific circumstances, initiating explosive polymerization. The substance may polymerize if it is not stabilized. This generates fire or explosion hazard. On combustion, forms toxic and corrosive gases including phosgene (see ICSC 0007) and hydrogen chloride (see ICSC 0163). Reacts with oxidants and powdered metals. This generates fire and explosion hazard. 

Formula: C4H5Cl / CH2=CClCH=CH2
Molecular mass: 88.5
Boiling point: 59.4°C
Melting point: -130°C
Relative density (water = 1): 0.96
Solubility in water, g/100ml at 20°C: 0.03 (very poor)
Vapour pressure, kPa at 20°C: 23.2
Relative vapour density (air = 1): 3.1
Relative density of the vapour/air-mixture at 20°C (air = 1): 1.5
Flash point: -20°C c.c.
Auto-ignition temperature: 440°C
Explosive limits, vol% in air: 1.9-20
Octanol/water partition coefficient as log Pow: 2.2 (calculated) 


EXPOSURE & HEALTH EFFECTS

Routes of exposure
The substance can be absorbed into the body by inhalation of its vapour, through the skin and by ingestion. 

Effects of short-term exposure
The substance is severely irritating to the eyes. The substance is irritating to the skin and respiratory tract. Exposure at high levels could cause lung oedema. The substance may cause effects on several organs. This may result in impaired functions. Exposure above the OEL could cause death. 

Inhalation risk
A harmful contamination of the air can be reached very quickly on evaporation of this substance at 20°C. 

Effects of long-term or repeated exposure
Repeated or prolonged contact with skin may cause dermatitis and hair loss. The substance may have effects on multiple organs. This may result in impaired functions. This substance is possibly carcinogenic to humans. 


OCCUPATIONAL EXPOSURE LIMITS
TLV: 1 ppm as TWA; (skin); A2 (suspected human carcinogen).
MAK: skin absorption (H); carcinogen category: 2 

ENVIRONMENT
 

NOTES
An added stabilizer or inhibitor can influence the toxicological properties of this substance; consult an expert.
The odour warning when the exposure limit value is exceeded is insufficient.
Do NOT use in the vicinity of a fire or a hot surface, or during welding.
Check for peroxides prior to distillation; eliminate if found.
Inhibitors such as hydroquinone or phenothiazine are generally added when it is to be stored.
Do NOT take working clothes home. 

ADDITIONAL INFORMATION
  EC Classification
Symbol: F, T; R: 45-11-20/22-36/37/38-48/20; S: 53-45; Note: D, E 

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    See Also:
       Toxicological Abbreviations
       Chloroprene  (SIDS)
       Chloroprene (IARC Summary & Evaluation, Volume 71, 1999)