Material Safety Data Sheet: Tert-Butyl Peroxybenzoate (Enox TBPB)

Identification

Product Name: Tert-Butyl Peroxybenzoate (Enox TBPB)
Chemical Family: Organic peroxide
CAS Number: 614-45-9
Synonyms: TBPB, Perbenzoic acid, tert-butyl ester
Intended Use: Polymerization initiator, curing agent for resins
Supplier Details: Manufacturer address, emergency contact phone number

Hazard Identification

GHS Classification: Organic Peroxide Type C, Acute Toxicity (oral, inhalation, dermal), Eye Irritation, Skin Irritation
Signal Word: Danger
Hazard Statements: Heating may cause a fire or explosion, harmful if swallowed, causes serious eye irritation, causes skin irritation, suspected of causing genetic defects
Pictograms: Flame, exclamation mark, health hazard
Precautionary Statements: Keep away from heat, sparks, open flames, hot surfaces, no smoking, wear protective gloves, clothing, and eye protection, store in a cool dry place away from direct sunlight and incompatible materials

Composition / Information on Ingredients

Chemical Identity: Tert-butyl peroxybenzoate
Concentration: 98-100%
Impurities and Stabilizing Additives: None present at hazardous levels
Chemical Formula: C11H14O3
Molecular Weight: 194.23 g/mol
Component breakdown: Tert-Butyl group (C4H9), Peroxybenzoate moiety

First Aid Measures

Inhalation: Move person to fresh air, provide oxygen if breathing is difficult, seek immediate medical attention
Skin Contact: Remove contaminated clothing, rinse skin thoroughly with water for 15 minutes, seek medical advice for irritation
Eye Contact: Rinse cautiously with water for several minutes, remove contact lenses, continue rinsing, seek immediate ophthalmological evaluation
Ingestion: Do not induce vomiting, rinse mouth, give small quantities of water if conscious, contact poison control center or nearest hospital
Most Important Symptoms: Redness, blistering, irritation, respiratory distress, chemical burns, potential delayed pulmonary effects
Notes for Physician: Symptomatic treatment, monitor for delayed onset symptoms, observe for pulmonary edema

Fire-Fighting Measures

Suitable Extinguishing Media: Water spray, dry chemical, foam, carbon dioxide
Unsuitable Extinguishing Media: Do not use direct water jets which may spread the product
Specific Hazards: Decomposes under heating, releases toxic fumes, may cause combustion or explosion
Protective Equipment: Full firefighting gear and self-contained breathing apparatus
Special Procedures: Evacuate area, cool containers with water spray even after fire is out, avoid breathing smoke or decomposition gases
Hazardous Decomposition: Benzene, tert-butanol, benzoic acid, carbon monoxide, carbon dioxide

Accidental Release Measures

Personal Precautions: Evacuate unnecessary personnel, avoid breathing vapors, provide adequate ventilation, wear suitable PPE such as goggles and gloves
Environmental Precautions: Prevent entry into drains, waterways, soil
Methods for Containment: Stop leak if safe to do so, keep away sources of ignition
Cleaning Methods: Absorb spill with inert material (sand, earth, vermiculite), place in closed, labeled container for disposal, decontaminate area with detergent and plenty of water
Disposal: Dispose of collected material in accordance with national or regional regulations

Handling and Storage

Safe Handling: Use only in well-ventilated locations, avoid breathing vapors, prevent contact with skin, eyes, and clothing, do not eat or drink during use, ground containers and equipment
Storage Requirements: Store under refrigeration between 2°C and 8°C in original tightly closed container, segregate from food and oxidizers, store away from acids, reducing agents, and combustible materials
Storage Hazards: Elevated temperatures increase risk of hazard, protect from sunlight and moisture, ensure fire protection measures are in place
Incompatible Materials: Bases, acids, amines, strong reducing agents, combustible substances
Packaging Advice: Use containers of polyethylene or glass, clearly labeled and tightly sealed

Exposure Controls and Personal Protection

Control Parameters: No established occupational exposure values
Engineering Controls: Use local exhaust, ensure eye wash stations and safety showers are accessible
Personal Protective Equipment: Chemical-resistant gloves (neoprene or nitrile), safety goggles, face shield, long-sleeved flame-retardant clothing, closed footwear, respiratory protection in insufficiently ventilated areas
Workplace Hygiene: Remove contaminated clothes immediately, wash hands before eating or drinking, avoid all contact with skin and eyes, keep all safety equipment maintained and in immediate reach

Physical and Chemical Properties

Appearance: Clear to pale yellow oily liquid
Odor: Aromatic, sharp
pH: Not applicable (non-aqueous)
Boiling Point: Decomposes before boiling
Melting Point: -7°C
Flash Point: 86°C (closed cup)
Autoinflammatory Temperature: 80-100°C
Solubility: Insoluble in water, soluble in organic solvents such as alcohols and ethers
Density: 1.12 g/cm³ at 20°C
Vapor Pressure: <0.1 mmHg at 20°C
Partition Coefficient (log Kow): Data not available
Decomposition Temperature: Rapid at >80°C with potential release of hazardous gases

Stability and Reactivity

Chemical Stability: Stable under recommended storage conditions
Reactivity: Reacts vigorously with acids, bases, amines, and strong reducing agents
Thermal Decomposition: Risk of exothermic decomposition at elevated temperatures or if contaminated
Possibility of Hazardous Reactions: Rapid decomposition can generate significant pressure and heat, risk of explosion
Conditions to Avoid: Open flames, hot surfaces, direct sunlight, high temperature, contamination
Incompatible Materials: Metals, peroxides, reducing agents, acids, oxidizers
Hazardous Decomposition Products: Benzene, carbon monoxide, carbon dioxide, benzoic acid, tert-butanol

Toxicological Information

Routes of Exposure: Inhalation, ingestion, skin contact, eye contact
Acute Toxicity: Harmful if swallowed (oral LD50 rat: 1029 mg/kg), toxic by skin contact and inhalation (<10 mg/L inhalation LC50 rat)
Irritation: Severe skin and eye irritant, can cause burns and blisters
Sensitization: May cause allergic skin reactions in susceptible individuals
Chronic Effects: Prolonged overexposure can damage liver, kidneys, and cause central nervous system symptoms
Carcinogenicity, Mutagenicity, Reproductive Toxicity: Not classified as carcinogenic, suspected mutagenicity due to organic peroxide structure, data on reproductive toxicity limited

Ecological Information

Aquatic Toxicity: Highly toxic to aquatic life (LC50 for fish: 2.1 mg/L / 96h)
Persistence and Degradability: Moderately persistent, decomposes under environmental conditions
Bioaccumulative Potential: Potential for bioaccumulation cannot be excluded with limited data
Soil Mobility: Low mobility due to insolubility in water
Other Harmful Effects: Breakdown may generate toxic byproducts, requires containment to prevent environmental damage, avoid contamination of ground and surface water

Disposal Considerations

Waste Disposal: Dispose via licensed chemical waste contractor, incineration recommended for small quantities
Packing Waste: Decontaminate containers before disposal, if not feasible destroy containers by controlled incineration
Environmental Caution: Do not flush to sewer, prevent discharge into natural water bodies, contain all residues
Regulation: Dispose in accordance with local, state, and national regulations for organic peroxides and hazardous industrial chemicals

Transport Information

UN Number: UN 3109
Proper Shipping Name: Organic peroxide type C, liquid (Tert-Butyl Peroxybenzoate)
Transport Hazard Class: 5.2 (Organic Peroxides)
Packing Group: II (medium danger)
Labels: Flame symbol (5.2), keep away from heat packaging instructions
Marine Pollutant: Yes
Special Precautions: Avoid mechanical shock and vibration, transport under refrigerated conditions, notify carrier of hazardous nature

Regulatory Information

OSHA: Classified hazardous, subject to Hazard Communication Standard
TSCA: Listed on Toxic Substances Control Act inventory
EU Classification: Symbol: O (Oxidizing), Xi (Irritant), N (Dangerous for the environment)
REACH Registration: Registered as a hazardous substance, requires SDS communication through the supply chain
Other Local/International Regulation: Subject to hazardous substance list regulations in many jurisdictions, specific requirements for storage, transport, and disposal must be adhered to support worker health and environmental safety