Benzoyl peroxide

  • Dibenzoyl peroxide
  • Benzoyl superoxide
Formula
(C6H5CO)2O2
Structure
Description
White, odorless powder.
Uses
Oxidizing agent in bleaching oils, flour, catalyst in the plastics industry, initiator in polymerization, source of free radicals for industrial processes.

Registry Numbers and Inventories.
CAS
94-36-0
EC (EINECS/ELINCS)
202-327-6
EC Index Number
617-008-00-0
EC Class
Explosive; Irritant; Sensitising
R 2 36 43
S 3/7 14 36/37/39
RTECS
DM8575000
RTECS class
Tumorigen; Mutagen; Primary Irritant
UN (DOT)
2089
Merck
13,1117
Beilstein/Gmelin
984320
Beilstein Reference
4-09-00-01052
EPA OPP
128964
Swiss Giftliste 1
G-1247
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C14H10O4
Formula mass
242.23
Melting point, °C
103-106
Boiling point, °C
350
Vapor pressure, mmHg
5E-5 (25 C)
Vapor density (air=1)
8.4
Odor Threshold Odor threshold Odorless
Density
1.334 g/cm3 (20 C)
Solubility in water
Insoluble
Refractive index
1.543 (20 C)
Partition coefficient, pKow
3.46
Heat of vaporization
59.4 kJ/mol
Heat of combustion
-6550 kJ/mol

Hazards and Protection.
Storage
Isolate in well-detached, fire-resistive, cool, well-ventilated building with no other materials included. Explosion venting. No electrical installations or heating facilities. Use original containers.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Wear appropriate protective gloves, clothing and goggles.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
ELIMINATE all ignition sources (no smoking, flares, sparks or flames in immediate area). Keep combustibles (wood, paper, oil, etc.) away from spilled material. Do not touch damaged containers or spilled material unless wearing appropriate protective clothing. Keep substance wet using water spray. Stop leak if you can do it without risk. SMALL SPILLS: Take up with inert, damp, noncombustible material using clean non-sparking tools and place into loosely covered plastic containers for later disposal.
Stability
Unstable, spontaneously explosive when heated. Highly reactive. Extremely explosion-sensitive to shock, heat, friction.
Incompatibilities
May react violently with inorganic or organic acids, alcohols, amines, metallic naphthenates and polymerization accelerators (e.g., N,N-dimethylaniline) May react explosively or violently with dimethyl sulfide, lithium aluminum hydride and aniline.

Fire.
Flash Point,°C
154
Autoignition, °C
80
Fire fighting
SMALL FIRES: Water spray or fog is preferred; if water not available use dry chemical, carbon dioxide or regular foam. LARGE FIRES: Flood fire area with water from a distance. Use water spray or fog; do not use straight streams. Move containers from fire area if you can do it without risk. Do not move cargo or vehicle if cargo has been exposed to heat. Fight fire from maximum distance or use unmanned hose holders or monitor nozzles. Cool containers with flooding quantities of water until well after fire is out. ALWAYS stay away from tanks engulfed in fire. For massive fire, use unmanned hose holders or monitor nozzles; if this is impossible, withdraw from area and let fire burn.
Fire potential
Very flammable. Decomposition vapors.
Hazards
May explode from heat, shock, friction or contamination. May ignite combustibles (wood, paper, oil, clothing, etc.). May be ignited by heat, sparks or flames. May burn rapidly with flare-burning effect. Containers may explode when heated. Runoff may create fire or explosion hazard.
Combustion products
Suffocating smoke evolved May explode
Health
1
 
Flammability
4
 
 
Reactivity
4
 
 
Special
O

Health.
Exposure limit(s)
TLV: ppm; 5 mg/m3 (as TWA) (ACGIH 1993-1994). MAK: ppm; 5 mg/m3; I (1992). MAK: class I (1992). OSHA PEL: TWA 5 mg/m3 NIOSH REL: TWA 5 mg/m3 NIOSH IDLH: 1500 mg/m3
Poison_Class
5
Exposure effects
   Ingestion
Abdominal pain.
   Inhalation
Coughing, sore throat. Irritates eyes, skin and respiratory tract.
   Skin
May cause severe injury or burns.
   Eyes
Inflammation of the eye may be noted from ocular exposure.

First aid
 
   Ingestion
DO NOT INDUCE VOMITING. If the victim is conscious and not convulsing, give 1 or 2 glasses of water to dilute the chemical and IMMEDIATELY call a hospital or poison control center. Be prepared to transport the victim to a hospital if advised by a physician.
   Inhalation
IMMEDIATELY leave the contaminated area; take deep breaths of fresh air. If symptoms (such as wheezing, coughing, shortness of breath, or burning in the mouth, throat, or chest) develop, call a physician and be prepared to transport the victim to a hospital. Provide proper respiratory protection to rescuers entering an unknown atmosphere. Whenever possible, Self-Contained Breathing Apparatus (SCBA) should be used.
   Skin
IMMEDIATELY flood affected skin with water while removing and isolating all contaminated clothing. Gently wash all affected skin areas thoroughly with soap and water. If symptoms such as redness or irritation develop, IMMEDIATELY call a physician and be prepared to transport the victim to a hospital for treatment.
   Eyes
First check the victim for contact lenses and remove if present. Flush victim's eyes with water or normal saline solution for 20 to 30 minutes while simultaneously calling a hospital or poison control center. Do not put any ointments, oils, or medication in the victim's eyes without specific instructions from a physician. IMMEDIATELY transport the victim after flushing eyes to a hospital even if no symptoms (such as redness or irritation) develop.

Transport.
UN number
2089
Response guide
Hazard class
5.2
USCG CHRIS Code
DPO