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Product Name: Styrene Oxide
Chemical Name: Phenylethylene oxide
CAS Number: 96-09-3
Synonyms: Epoxyethylbenzene, Epoxystyrene, NSC 9800
Recommended Use: Chemical intermediate, research and industrial applications
Manufacturer: Listed on packaging or supplier documentation
Emergency Contact: Refer to national poison control center, company emergency numbers provided on label
Classification: Flammable liquid, acute toxicity (oral, dermal, inhalation), skin sensitization, carcinogenicity, specific target organ toxicity
Signal Word: Danger
Hazard Statements: Causes skin and eye irritation, may cause an allergic skin reaction, suspected of causing genetic defects, may cause cancer, harmful if swallowed or inhaled, causes damage to organs through prolonged or repeated exposure
Precautionary Notes: Avoid breathing vapors, use only outdoors or in well-ventilated area, wear protective gloves and eye protection, wash hands thoroughly after handling
Chemical Name: Styrene Oxide
Concentration: ≥98%
CAS Number: 96-09-3
Impurities: Trace amounts of water, polymerization inhibitors like tert-butylcatechol present in some commercial products
Molecular Formula: C8H8O
Molecular Weight: 120.15 g/mol
General Advice: Remove victim from exposure. Keep warm and at rest. Seek medical attention if symptoms persist or develop.
Inhalation: Move to fresh air, keep affected person at rest, monitor respiratory function. Get immediate medical advice if breathing is difficult.
Skin Contact: Remove contaminated clothing, wash affected area with plenty of water and mild soap. Seek medical help if irritation continues.
Eye Contact: Rinse cautiously with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing. Get medical attention promptly.
Ingestion: Rinse mouth, do not induce vomiting. Seek immediate medical care.
Suitable Extinguishing Media: Use water fog, dry chemical, alcohol-resistant foam, or carbon dioxide to extinguish fire.
Hazards from Combustion: Produces carbon monoxide, carbon dioxide, and potentially irritating or toxic fumes on burning.
Protective Equipment: Firefighters wear self-contained breathing apparatus and full protective gear.
Special Precautions: Cool containers with water spray to prevent rupture from heat exposure. Remove all ignition sources.
Personal Precautions: Isolate spill, keep unprotected persons away. Use protective equipment such as gloves, lab coat, safety goggles, approved respirator if risk of inhalation exists.
Environmental Precautions: Prevent entry into sewers, groundwater, or drains. Notify authorities if large quantities reach waterways.
Methods for Cleanup: Absorb liquid with inert material (sand, earth, vermiculite), shovel into suitable container for disposal. Ventilate area. Wash spill site with water after material removal.
Handling: Use only in well-ventilated areas. Avoid contact with skin, eyes, and clothing. Do not breathe vapors or mists. Keep away from heat, sparks, and open flames. Ground all equipment containing material.
Storage: Store in tightly closed container, in a cool, dry, and well-ventilated location. Protect from light and incompatible substances. Segregate from strong oxidizers, acids, and bases. Avoid temperature extremes. Keep container upright and labeled.
Exposure Limits: OSHA TWA 50 ppm (Styrene); NIOSH REL TWA 50 ppm; ACGIH TLV-TWA 20 ppm for styrene (styrene oxide not specifically regulated, follow styrene limitations as guidance)
Engineering Controls: Local exhaust ventilation or chemical fume hood preferred to minimize exposure.
Personal Protective Equipment: Wear chemical-resistant gloves, safety glasses with side shields, flame-resistant lab coat or apron. Use positive-pressure respirators in poorly ventilated areas. Avoid contact lenses.
Hygiene Measures: Wash hands thoroughly after handling. Do not eat, drink, or smoke during use.
Appearance: Colorless to pale yellow oily liquid
Odor: Mild, sweet aromatic
Odor Threshold: Not established
pH: Not applicable
Melting Point: −55 °C
Boiling Point: 194–195 °C
Flash Point: 78 °C (closed cup)
Evaporation Rate: Not determined
Flammability: Flammable liquid
Vapor Pressure: 0.5 mmHg at 25 °C
Vapor Density: 4.1 (air = 1)
Relative Density: 1.05 g/cm³ at 20 °C
Solubility: Slightly soluble in water; miscible with alcohol, ether, chloroform
Partition Coefficient: log Kow: 1.61
Auto-Ignition Temperature: 510 °C
Decomposition Temperature: Data not available
Chemical Stability: Stable under recommended storage conditions, can polymerize or oxidize upon prolonged exposure to air, light, or heat.
Conditions to Avoid: Strong heat, open flames, spark sources, prolonged exposure to air or sunlight.
Incompatible Materials: Strong acids, strong bases, oxidizing agents, reducing agents, amines.
Hazardous Decomposition: Produces toxic fumes of carbon monoxide, carbon dioxide, phenolics, and possible traces of styrene.
Hazardous Polymerization: Can occur with heat or contamination.
Acute Toxicity: LD50 (oral, rat): 660 mg/kg; LD50 (dermal, rabbit): 1,330 mg/kg
Routes of Exposure: Inhalation, ingestion, skin and eye contact
Symptoms: Eye and skin irritation, respiratory tract irritation, headache, dizziness, nausea, vomiting
Chronic Effects: Possible carcinogen, potential for genotoxicity and reproductive toxicity from animal data
Sensitization: May cause allergic skin reactions in sensitive individuals
Carcinogenic Category: IARC Group 2A (probable human carcinogen), NTP reasonably anticipated to be a human carcinogen
Ecotoxicity: Toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment
Aquatic Toxicity: LC50 (fish, 96 hr): 25 mg/L; EC50 (daphnia, 48 hr): 8 mg/L
Persistence and Degradability: Biodegradation is slow; potential for accumulation exists
Bioaccumulative Potential: Log Kow indicates low to moderate potential
Mobility in Soil: Moderate, not strongly adsorbed
Other Adverse Effects: Avoid release to the environment
Waste Treatment Methods: Dispose of in accordance with local, state, and federal regulations. Do not discharge to sewers.
Contaminated Packaging: Rinse thoroughly, handle as hazardous material. Containers must be triple rinsed, punctured, and removed to hazardous waste collection site.
Incineration: Permit only in approved facilities, with pollution control.
Precautions: Minimize direct exposure. Avoid landfill if possible.
UN Number: UN 2810
Proper Shipping Name: Toxic liquid, organic, n.o.s. (Styrene Oxide)
Transport Hazard Class: 6.1 Toxic substances
Packing Group: III
IMDG Code: Marine pollutant, regulated for sea transport
Transport Precautions: Store upright, secure during transport, avoid rough handling, segregate from incompatible materials
OSHA Status: Regulated hazardous substance
TSCA Listing: Listed on Toxic Substances Control Act Inventory
SARA Title III: Sections 302, 311/312, and 313 may apply; check local applicability
California Prop. 65: Listed as a chemical known to cause cancer
EU Regulations: Classified as a hazardous substance under REACH and CLP Regulations
Other Listings: Hazardous Air Pollutant (HAP) by the US EPA, subject to workplace exposure standards globally
