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DICUMYL PEROXIDE
ICSC: 1346
Peer-Review Status: 18.10.1999 Validated
Peroxide, bis(1-methyl-1-phenylethyl)
Bis(alpha,alpha-dimethylbenzyl)peroxide
Diisopropylbenzene peroxide 
CAS #: 80-43-3 RTECS #: SD8150000
UN #: 3110
EC #: 617-006-00-X
EINECS #: 201-279-3
    Formula: C18H22O2 / (C6H5C(CH3)2O)2
Molecular mass: 270.4

TYPES OF
HAZARD /
EXPOSURE
ACUTE HAZARDS / SYMPTOMS      PREVENTION      FIRST AID / FIRE FIGHTING
FIRE Combustible.  NO open flames.  Use water spray, powder, foam, carbon dioxide. 
EXPLOSION Finely dispersed particles form explosive mixtures in air.  Closed system, ventilation, explosion-proof electrical equipment and lighting. Prevent deposition of dust.   
 
EXPOSURE   PREVENT DISPERSION OF DUST!   
Inhalation Cough. Sore throat.  Use local exhaust or breathing protection.  Fresh air, rest. 
Skin Redness.  Protective gloves.  First rinse with plenty of water for at least 15 minutes, then remove contaminated clothes and rinse again. 
Eyes Redness.  Wear safety spectacles or eye protection in combination with breathing protection.  First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention. 
Ingestion   Do not eat, drink, or smoke during work.  Rinse mouth. Give one or two glasses of water to drink. Refer for medical attention . 

SPILLAGE DISPOSAL
PACKAGING & LABELLING
Remove all ignition sources. Sweep spilled substance into covered containers. If appropriate, moisten first to prevent dusting. Carefully collect remainder. Then store and dispose of according to local regulations. Do NOT let this chemical enter the environment. Personal protection: P2 filter respirator for harmful particles.   
EC Classification
Symbol: O, Xi, N; R: 7-36/38-51/53; S: (2)-3/7-14-36/37/39-61 
UN Classification
UN Hazard Class: 5.2; UN Pack Group: II 
GHS Classification
 

EMERGENCY RESPONSE SAFE STORAGE
  Fireproof. Separated from combustible substances, reducing agents, strong oxidants, strong acids, bases and heavy metals. Cooled. Keep in the dark. Well closed. Keep under inert gas. 

IMPORTANT DATA
Physical State; Appearance
YELLOW-TO-WHITE CRYSTALLINE POWDER. 

Physical dangers
 

Chemical dangers
Decomposes rapidly on heating. Decomposes rapidly under the influence of light. This generates fire and explosion hazard. Reacts violently with acids, bases, reducing agents and heavy metals. 

Occupational exposure limits
TLV (NOT-ESTABLISHED):. 

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

Inhalation risk
Evaporation at 20°C is negligible; a harmful concentration of airborne particles can, however, be reached quickly when dispersed. 

Effects of short-term exposure
The substance is irritating to the eyes, skin and respiratory tract. 

Effects of long-term or repeated exposure
 


PHYSICAL PROPERTIES ENVIRONMENTAL DATA
Decomposes at 130°C
Melting point: 39°C
Density: 1.0 g/cm³
Solubility in water: none
Relative vapour density (air = 1): 9.3
Flash point: 71°C c.c.
Octanol/water partition coefficient as log Pow: 5.5  
The substance is toxic to aquatic organisms. Bioaccumulation of this chemical may occur in fish. 

NOTES
 

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