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Name: Benzoyl Hydroperoxide
Chemical Formula: C14H10O4
Common Uses: Dental materials, acne medications, industrial polymerization
Physical Appearance: White crystalline powder or granular paste with a sharp odor
Hazard Class: Organic Peroxide Type B
Health Hazards: Causes severe skin burns, eye damage, respiratory irritation. Intense skin sensitization reported among laboratory and factory workers.
Environmental Hazards: Dangerous to aquatic life; may persist and bioaccumulate in waterways.
Physical Hazards: Highly flammable. Releases oxygen, supporting combustion. Explosive risk grows above 55°C and from friction/impact.
Main Ingredient: Benzoyl Hydroperoxide, usually around 50-75% in paste or powder forms
Stabilizers: Phthalate esters, dimethyl phthalate, or water in some formulations
Impurities: Trace benzoic acid or other breakdown products can appear over time, especially under heat or light exposure
Inhalation: Move outdoors or to fresh air if dust or fumes are inhaled; monitor for difficulty breathing.
Skin Contact: Remove contaminated clothing, rinse skin with running water for at least 15 minutes; seek medical attention for burns or persistent irritation.
Eye Contact: Rinse cautiously with water for several minutes, holding eyelids apart. Immediate medical help is crucial for stinging or vision changes.
Swallowing: Rinse mouth, do not induce vomiting. Drink water if conscious, but hospital evaluation is urgent due to risk of corrosive injury, shock, or aspiration.
Suitable Extinguishing Media: Water spray, large volumes only; avoid dry chemical, foam, or CO2 on large fires due to oxygen release hazards.
Protective Equipment: Full bunker gear, face shield, and positive pressure self-contained breathing apparatus. Runoff may be toxic.
Specific Hazards: Rapid oxygen release causes violent combustion; risk of explosion from friction, shock, or contamination. Vapors may travel and ignite away from the source.
Fire Fighting Advice: Fight fire from a safe distance. If safe, cool exposed containers with flooding quantities of water. Avoid breathing decomposition gases, including benzoic acid vapors and phenyl radicals.
Small Spills: Evacuate unprotected people, ventilate area. Scoop spilled powder into a clean, sealed, plastic drum. Slightly wet powder with water to suppress dust.
Large Spills: Isolate the zone. Notify emergency services. Douse with water spray—not jets—to minimize fire risk. Use non-sparking, non-metallic tools.
Environmental Precautions: Prevent escape to sewers and waterways. Provide containment booms if near floor drains.
Personal Protection: Chemical splash goggles, gloves made of butyl or nitrile rubber, impermeable apron, positive pressure respirator if dust is visible or ventilation is poor.
Handling: Use within a ventilated hood or enclosure. Minimize friction or shock; avoid contact with reducing agents, metals, acids, or easily oxidized organic material.
Storage: Store in original, vented containers, upright, and well away from incompatible substances. Keep cool, preferably below 30°C, away from sunlight and sources of ignition.
Incompatibilities: Acetone, strong acids, bases, combustible materials. Mixing triggers violent reactions or spontaneous flaming.
Shelf Life Concerns: Degradation occurs if prolonged exposure to heat, impact, or incorrect storage conditions happens. Check containers for bulging or crystallization, and do not open if abnormal pressure is present.
Exposure Limits: OSHA and ACGIH recommend airborne benzoyl peroxide not exceed 5 mg/m³ over an 8-hour TWA.
Engineering Controls: Use local exhaust ventilation. Closed systems or glove boxes recommended for large-scale work.
Personal Protection: Chemical-resistant gloves, safety glasses with side shields or full face mask, flame-retardant lab coat. In confined areas, approved respirators or air-supplied units for particulates.
Form: White granular crystals, powder, or moist paste
Odor: Sharp, acrid, sometimes resembling chlorinated solvents
Melting Point: Decomposes at about 103°C; actual melting typically not observed as breakdown precedes liquefaction
Solubility: Insoluble in water, soluble in many organic solvents like ethers and alcohols
Vapor Pressure: Minimal under ambient conditions
Density: Around 1.33 g/cm³ for pure material
Partition Coefficient: Moderate affinity for organic versus aqueous phases; helps explain risk in aquatic systems
Decomposition: Violent, exothermic liberation of benzoic acid, oxygen, and carbon oxides
Chemical Stability: Stable under cool, dry, ventilated storage. Destabilized by heat, friction, light, or contamination with incompatible materials.
Polymerization: Not spontaneous, but rapid decomposition can trigger local thermal runaway.
Hazardous Decomposition: Benzoic acid, phenyl radicals, carbon monoxide, carbon dioxide, trace phosgene if chlorinated solvents are present.
Reactivity: Will oxidize or ignite combustibles and is shock sensitive at higher concentrations and temperatures.
Acute Effects: Severe eye, skin, and respiratory tract irritation. Risk scratches the surface—long-term exposure in industrial workers shows increased dermatitis, asthma, and allergy rates.
Chronic Effects: Reports connect repeated skin contact with persistent eczema. No strong evidence of carcinogenicity but insufficient human data.
Inhalation: Causes headaches, coughing, chest discomfort with enough airborne dust. Higher exposures risk chemical pneumonia.
Swallowing: Burns mouth and esophagus; large doses provoke shock and serious internal injury.
Skin/Eye Contact: Direct exposure risks permanent scarring without prompt attention. Long healing times common after burns; consult specialists for severe injuries.
Aquatic Toxicity: Harmful to fish and invertebrates at low concentrations; damages gill and shell formation in tested species.
Persistence: Breaks down in sunlight, but persistent by-products like benzoic acid accumulate in stagnant water.
Bioaccumulation: Seen in aquatic food chains; regular industrial discharge increases risk.
Soil Mobility: Limited; breaks down more rapidly in biologically active soils, but localized spills kill plant roots and damage local ecology.
Recommended Methods: Incinerate solids in a well-controlled, permitted facility. Small quantities for laboratory disposal can react with sodium thiosulfate before disposal.
Prohibited: Never flush into water systems or landfill dry material; explosion or groundwater contamination can result.
Packaging: Used packaging or containers must be decontaminated by thorough washing and removed according to local regulations.
Precautions: Document all transfers and residual handling, especially in healthcare or school labs where improper disposal can spark emergencies.
UN Number: 3106 or 3108 (depending on formulation)
Class: Organic peroxide, class 5.2
Labeling: "Organic Peroxide," flame symbol, “Keep Away From Heat” warnings.
Transport Precautions: Ship only in vented, explosion-resistant containers. Trucks and storage spaces must stay cool and shaded.
Incident Management: Rules tighten above certain quantities; carriers must have emergency plans, responder gear, and pre-arranged routes to avoid tunnels or dense population centers.
OSHA: Listed as hazardous, requires strict workplace controls and notification signage.
EPA: Regulated as a hazardous substance; disposal, discharge and storage covered under federal and state hazardous waste rules.
International: Transport governed by the United Nations Orange Book and the IMDG code.
Workplace Rights: Employees involved in handling have a legal right to receive training on risks and proper controls, and to access safety information at any time without barriers.
