- Cumyl hydroperoxide
- alpha,alpha-dimethylbenzyl hydroperoxide
Colorless to pale-yellow liq.
Production of acetone and phenol, polymerization catalyst, particularly in the redox systems, used for rapid polymerization.
Registry Numbers and Inventories.
EC Index Number
Oxidising; Toxic; Harmful; Corrosive; Dangerous for the Environment
R 7 21/22 23 34 48/20/22 51/53
S 3/7 14 36/37/39 45 60 61
Tumorigen; Mutagen; Primary Irritant
Swiss Giftliste 1
Japan ENCS (MITI)
Melting point, °C
44 - 45
Boiling point, °C
Vapor pressure, mmHg
0.05 (25 C)
Vapor density (air=1)
1.0612 g/cm3 (20 C)
Solubility in water
15 g/L (20 C)
1.5246 (20 C)
Partition coefficient, pKow
Heat of vaporization
Heat of combustion
Hazards and Protection.
Store at in original packaging. Do not return product that has been taken out. store below 52 C and out of sunlight. protect against physical damage. Store at in a cool, dry, well-ventilated, unheated, well-detached noncombustible building with noncombustible floors. Isolate from other storage. Isolate particularly from accelerators, readily oxidizable, or organic, or flammable materials. Large-quantity storage should be protected by automatic deluge sprinkler system.
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.
Strongly recommended that workmen wear safety goggles, an apron, and rubber boots. Org peroxides persons handling peroxides should use safety glasses with side shields, goggles or face shield for eye protection. Emergency eyewash facilities should be provided. Gloves, aprons and other protective clothing as necessary should be used to prevent skin contact. Clothing and equipment that generate static electricity should be avoided. Smoking should be prohibited.
Wear positive pressure self-contained breathing apparatus (SCBA).
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.
Decomposes violently when involved in a fire or when in contact with impurities.
May react explosively upon contact with reducing reagents Violent reaction occurs upon contact with copper, copper alloys, lead alloys, and mineral acids.
Atconcentrationsof 91 and 95%, cumene hydroperoxide decomposed violently at about 150 C. Above 125 C principal hazard is phenol formation other compounds which have been reported to be formed are 2-phenyl, 2-hydroxypropane acetophenone. When heated to decomposition, emits acrid smoke and fumes. Contaminants may catalyze decomposition at lower temperatures.
Upper exp. limit, %
Lower exp. limit, %
Fire Extinguishing Agents Not to Be Used: Water may be ineffective.Fire Extinguishing Agents: Foam, dry chemical, or carbon dioxide
Moderately flammable. The solution may take some effort to ignite; but once ignited, it burns with increasing vigor as the fire progresses. Highly combustible. Ignition and explosion may occur by mixing with readily oxidizable, organic, or combustible materials.
May explode from heat or contamination. May ignite combustibles (wood, paper, oil, clothing, etc.).
Toxic phenol vapors may form from hot material.
Abnormally low blood pressure and apnea have been reported with severe poisonings. Cerebral edema, cerebral gas embolism, cerebral infarction, and seizures have been reported following ingestion of concentrated (35%) solutions. Death has been reported as a result of embolic cerebrovascular injury.
Serious gi complications have resulted from the ingestion of concentrated solutions and enemas with dilute peroxide solutions.
Inhalation of vapors from concentrated (greater than 10%) solutions may result in severe pulmonary irritation. Interstitial lung disease and respiratory arrest have also been reported following massive exposures.
Dermal exposure to dilute (3%) solutions generally results in a bleaching of the affected area in association with a tingling sensation and lasts 2 to 3 hours, if washed promptly after contact.
Pain, redness, severe deep burns.
DO NOT INDUCE VOMITING. Corrosive chemicals will destroy the membranes of the mouth, throat, and esophagus and, in addition, have a high risk of being aspirated into the victim's lungs during vomiting which increases the medical problems. 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. IMMEDIATELY transport the victim to a hospital. If the victim is convulsing or unconscious, do not give anything by mouth, ensure that the victim's airway is open and lay the victim on his/her side with the head lower than the body. DO NOT INDUCE VOMITING. Transport the victim IMMEDIATELY to a hospital.
IMMEDIATELY leave the contaminated area; take deep breaths of fresh air. IMMEDIATELY call a physician and be prepared to transport the victim to a hospital even if no symptoms (such as wheezing, coughing, shortness of breath, or burning in the mouth, throat, or chest) develop. Provide proper respiratory protection to rescuers entering an unknown atmosphere. Whenever possible, Self-Contained Breathing Apparatus (SCBA) should be used.
IMMEDIATELY flood affected skin with water while removing and isolating all contaminated clothing. Gently wash all affected skin areas thoroughly with soap and water. IMMEDIATELY call a hospital or poison control center even if no symptoms (such as redness or irritation) develop. IMMEDIATELY transport the victim to a hospital for treatment after washing the affected areas.
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.
USCG CHRIS Code