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1,3-PENTADIENE
ICSC: 1722
Peer-Review Status: 13.11.2008 Validated
Penta-1,3-diene
1-Methylbutadiene
Piperylene 
CAS #: 504-60-9 RTECS #: RZ2464000
UN #: 3295
EINECS #: 207-995-2
    Formula: CH2(CH)3CH3
Molecular mass: 68.1

TYPES OF
HAZARD /
EXPOSURE
ACUTE HAZARDS / SYMPTOMS      PREVENTION      FIRST AID / FIRE FIGHTING
FIRE Highly flammable.  NO open flames, NO sparks and NO smoking.  Use water spray, foam, powder, carbon dioxide. 
EXPLOSION Vapour/air mixtures are explosive. Heating will cause rise in pressure with risk of bursting.  Closed system, ventilation, explosion-proof electrical equipment and lighting. Do NOT use compressed air for filling, discharging, or handling. Use non-sparking handtools.  In case of fire: keep drums, etc., cool by spraying with water. 
 
EXPOSURE   PREVENT GENERATION OF MISTS!   
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
PACKAGING & 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.   
EC Classification
 
UN Classification
UN Hazard Class: 3; UN Pack Group: II 
GHS Classification
Signal: Danger
Highly flammable liquid and vapour
May be harmful if swallowed
May be harmful if inhaled vapour
Causes mild skin irritation
Causes eye irritation
May be harmful if swallowed and enters airways 
flam;flamecancer;health haz

EMERGENCY RESPONSE SAFE STORAGE
NFPA Code: H2; F3; R2.  Separated from strong oxidants. Fireproof. Store in an area without drain or sewer access. Ventilation along the floor. 

IMPORTANT DATA
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. 

Occupational exposure limits
TLV not established.
MAK (not established):. 

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

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 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. 

Effects of long-term or repeated exposure
 


PHYSICAL PROPERTIES ENVIRONMENTAL DATA
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) 
 

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
 

IPCS
International
Programme on
Chemical Safety
WHO ILO EC Prepared in the context of cooperation between the International Programme on Chemical Safety and the European Commission
© IPCS 2004-2012
LEGAL NOTICE Neither the EC nor the IPCS nor any person acting on behalf of the EC or the IPCS is responsible for the use which might be made of this information.


    See Also:
       Toxicological Abbreviations
       1,3-Pentadiene  (SIDS)