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BENZOYL PEROXIDEICSC: 0225
April 2002
CAS #: 94-36-0Dibenzoyl peroxide
Benzoyl superoxide
UN #: 3104
EINECS #: 202-327-6

  ACUTE HAZARDS PREVENTION FIRE FIGHTING
FIRE & EXPLOSION Many reactions may cause fire or explosion.  Risk of fire and explosion. Explosive. See Chemical Dangers.  NO open flames, NO sparks and NO smoking. NO contact with flammables. NO contact with hot surfaces.  Do NOT expose to friction or shock. Use non-sparking handtools.  Use water in large amounts.  In case of fire: keep drums, etc., cool by spraying with water. Combat fire from a sheltered position. 

 PREVENT DISPERSION OF DUST!  
  SYMPTOMS ACUTE HAZARDS FIRST AID
Inhalation Cough. Sore throat.  Use local exhaust or breathing protection.  Fresh air, rest. 
Skin Redness.  Protective gloves. Protective clothing.  Remove contaminated clothes. Rinse and then wash skin with water and soap. 
Eyes Redness.  Wear safety goggles.  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 CLASSIFICATION & LABELLING
Evacuate danger area! Remove all ignition sources. Wash away remainder with plenty of water. Do NOT absorb in saw-dust or other combustible absorbents. 

According to UN GHS Criteria

 

Transportation
UN Classification
UN Hazard Class: 5.2; UN Pack Group: II 

STORAGE
Fireproof. Separated from combustible substances and reducing agents. Store only in original packaging. See Chemical Dangers. 
PACKAGING
 
BENZOYL PEROXIDE ICSC: 0225
PHYSICAL & CHEMICAL INFORMATION

Physical State; Appearance
WHITE CRYSTALS OR POWDER. 

Physical dangers
 

Chemical dangers
May decompose explosively on shock, friction or concussion. May explode on heating above 103-105°C. On combustion, forms irritating and toxic fumes and gases of benzoic acid (see ICSC 0103) and carbon monoxide (see ICSC 0023). The substance is a strong oxidant. It reacts violently with combustible and reducing materials. Reacts violently with many organic acids, inorganic acids, alcohols and amines. This generates fire and explosion hazard. 

Formula: C14H10O4
Molecular mass: 242.2
Decomposes at 103-105°C
Density: 1.3 g/cm³
Solubility in water: poor
Vapour pressure, kPa at 20°C: <0.1
Auto-ignition temperature: 80°C
Octanol/water partition coefficient as log Pow: 3.46  


EXPOSURE & HEALTH EFFECTS

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

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

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

Effects of long-term or repeated exposure
Repeated or prolonged contact may cause skin sensitization. 


Occupational exposure limits
TLV: 5 mg/m3, - ppm, as TWA; A4 (not classifiable as a human carcinogen).
MAK: 5 mg/m3; peak limitation category: I(1) 

ENVIRONMENT
 

NOTES
Carrier solvents used in commercial formulations may change physical and toxicological properties.
Rinse contaminated clothes (fire hazard) with plenty of water. 

ADDITIONAL INFORMATION
  EC Classification
Symbol: E, Xi; R: 2-36-43; S: (1/2)-3/7-14-36/37/39 

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    See Also:
       Toxicological Abbreviations
       BENZOYL PEROXIDE (JECFA Evaluation)
       Benzoyl peroxide (SIDS)
       Benzoyl Peroxide (IARC Summary & Evaluation, Volume 71, 1999)