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1,3-PENTADIENEICSC: 1722 (November 2008)
Penta-1,3-diene
1-Methylbutadiene
Piperylene
CAS #: 504-60-9
UN #: 3295
EC Number: 207-995-2

  ACUTE HAZARDS PREVENTION FIRE FIGHTING
FIRE & EXPLOSION Highly flammable.  Vapour/air mixtures are explosive. Heating will cause rise in pressure with risk of bursting.  NO open flames, NO sparks and NO smoking.  Closed system, ventilation, explosion-proof electrical equipment and lighting. Do NOT use compressed air for filling, discharging, or handling. Use non-sparking handtools.  Use water spray, foam, powder, carbon dioxide.  In case of fire: keep drums, etc., cool by spraying with water. 

 PREVENT GENERATION OF MISTS!  
  SYMPTOMS PREVENTION FIRST AID
Inhalation   Use ventilation.  Fresh air, rest. Seek medical attention if you feel unwell. 
Skin Redness.  Protective gloves.  Remove contaminated clothes. Rinse and then wash skin with water and soap. Refer for medical attention if skin irritation occurs. 
Eyes Redness.  Wear safety spectacles.  Rinse with plenty of water (remove contact lenses if easily possible). 
Ingestion Nausea. Vomiting. Aspiration hazard!  Do not eat, drink, or smoke during work.  Rinse mouth. Do NOT induce vomiting. Seek medical attention if you feel unwell. 

SPILLAGE DISPOSAL CLASSIFICATION & LABELLING
Remove all ignition sources. Evacuate danger area! Consult an expert! Personal protection: filter respirator for organic gases and vapours adapted to the airborne concentration of the substance. Ventilation. Collect leaking liquid in covered 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;flamecancer;health haz
DANGER
Highly flammable liquid and vapour
May be harmful if swallowed or if inhaled
Causes mild skin irritation
Causes eye irritation
May be harmful if swallowed and enters airways 

Transportation
UN Classification
UN Hazard Class: 3; UN Pack Group: II 

STORAGE
Separated from strong oxidants. Fireproof. Store in an area without drain or sewer access. Ventilation along the floor. 
PACKAGING
 
1,3-PENTADIENE ICSC: 1722
PHYSICAL & CHEMICAL INFORMATION

Physical State; Appearance
COLOURLESS LIQUID. 

Physical dangers
The vapour is heavier than air and may travel along the ground; distant ignition possible. 

Chemical dangers
Reacts violently with strong oxidants. Can form peroxides which may initiate a polymerisation reaction. 

Formula: CH2(CH)3CH3
Molecular mass: 68.1
Boiling point: 42°C
Melting point: -87°C
Density: 0.7 g/cm³
Solubility in water, g/100ml: 0.069 (very poor)
Vapour pressure, kPa at 25°C: 53.3
Relative vapour density (air = 1): 2.35
Relative density of the vapour/air-mixture at 20°C (air = 1): 1.7
Flash point: -28°C c.c.
Explosive limits, vol% in air: 2.0 - 8.3
Octanol/water partition coefficient as log Pow: 1.5 (estimated) 


EXPOSURE & HEALTH EFFECTS

Routes of exposure
The substance can be absorbed into the body by inhalation. 

Effects of short-term exposure
The vapour is irritating to the eyes and skin. If swallowed the substance may cause vomiting and could result in aspiration pneumonitis. The effects may be delayed. 

Inhalation risk
A harmful contamination of the air will not or will only very slowly be reached on evaporation of this substance at 20°C. 

Effects of long-term or repeated exposure
 


OCCUPATIONAL EXPOSURE LIMITS
 

ENVIRONMENT
 

NOTES
The commercial mixture of 1,3-pentadiene consists of 80% of the trans-isomer (CAS 2004-70-8) and 20% of the cis-isomer (CAS 1574-41-0). CAS 504-60-9 is for unspecified or mixed isomer.
Do NOT take working clothes home. 

ADDITIONAL INFORMATION
  EC Classification
 

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    See Also:
       Toxicological Abbreviations