© 2026 Nanjing Finechem Holdings Co., Ltd,
All Right Reserved
Product Name: Estireno
Chemical Name: Ethenylbenzene
Synonyms: Vinylbenzene, Phenylethene
CAS Number: 100-42-5
Molecular Formula: C8H8
Use: Manufacture of plastics, synthetic rubbers, resins
Manufacturer: Contact chemical supplier for full manufacturer details
Telephone for Information: Emergency technical support line recommended
Email: Refer to supplier documentation for a specific address
Emergency Telephone: National emergency number or local Poison Control
Classification: Flammable liquid, acute toxicity (inhalation), skin and eye irritant, suspected carcinogen
GHS Label Elements: Flame, health hazard, exclamation mark, environment symbol
Signal Word: Danger
Hazard Statements: Highly flammable liquid and vapor; causes skin and eye irritation; may cause respiratory irritation or drowsiness/dizziness; suspected of causing cancer; harmful to aquatic life with long-lasting effects
Precautionary Statements: Keep away from heat, sparks, open flames; use non-sparking tools; avoid breathing fumes; wear eye/face/skin protection; use only outdoors or in well-ventilated area; wash thoroughly after handling
Routes of Exposure: Inhalation, skin contact, eye contact, ingestion
Chemical Name: Styrene
Concentration: 98–100%
Impurities: May contain trace amounts of inhibitors (tert-butylcatechol), benzene (potential contaminant in commercial grades)
Other Additives: None reported in standard industrial grades
Mixture Status: Substance, not a mixture or preparation for hazard classification
Inhalation: Move affected person to fresh air; monitor breathing; provide oxygen if breathing is difficult; seek medical attention for symptoms such as headache, dizziness, or respiratory distress
Skin Contact: Remove contaminated clothing; rinse skin thoroughly with soap and water for at least 15 minutes; do not apply ointments; obtain medical evaluation for persistent irritation
Eye Contact: Flush eyes immediately with plenty of water for at least 15 minutes while lifting eyelids; remove contact lenses if present; continue rinsing and seek urgent medical care
Ingestion: Do not induce vomiting; rinse mouth with water; never give fluids if unconscious or drowsy; seek prompt medical attention; monitor for nausea, confusion, or other acute effects
Notes to Physician: Treat symptoms; monitor respiratory and neurological functions; consider late-onset pulmonary edema; symptomatic and supportive care recommended
Flash Point: 31°C (closed cup)
Auto-ignition Temperature: 490°C
Flammable Limits: Lower: 1.1%, Upper: 6.1% (by volume in air)
Suitable Extinguishing Media: Foam, dry chemical, carbon dioxide, water spray for larger fires
Unsuitable Extinguishing Media: Do not use direct water stream on spilled liquid
Specific Fire Hazards: Highly flammable; vapors form explosive mixtures with air; vapors heavier than air and can travel long distances to ignition sources
Hazardous Combustion Products: Carbon dioxide, carbon monoxide, smoke, irritating and toxic fumes, possible formation of phenol and benzene
Protective Equipment for Firefighters: Self-contained breathing apparatus and full protective suit; isolate area and fight fire from safe distance
Personal Precautions: Evacuate unnecessary personnel; ventilate area; remove all sources of ignition; avoid inhaling vapors or contact with liquid
Protective Equipment: Use chemical-resistant gloves, safety goggles, face shield, antistatic boots, and suitable respirator
Environmental Precautions: Prevent entry into sewers, waterways, or soil; report major release to relevant authorities
Methods for Clean-up: Absorb spillage using inert materials (sand, earth, vermiculite); collect in sealable containers for proper disposal; use spark-proof tools and equipment
Decontamination: Flush area with water after removal; ventilate and monitor for vapor residues; dispose of contaminated materials per hazardous waste regulations
Handling: Ground and bond containers during transfer; only use in well-ventilated areas; keep away from ignition sources; avoid inhalation, skin and eye contact; maintain personal protective equipment; handle in compliance with process safety management practices
Advice on Safe Handling: Use explosion-proof equipment; implement effective exhaust ventilation at points of vapor generation; do not eat, drink or smoke during use; avoid static electricity buildup
Storage Conditions: Store in a cool, dry, well-ventilated location away from direct sunlight and incompatible materials; keep in original, tightly closed, properly labeled containers
Incompatible Materials: Strong oxidizers, acids, halogens, chlorine, peroxides
Storage Temperature: Keep below 25°C if possible; check inhibitor levels for long-term storage
Packaging Materials: Use steel drums or approved containers compatible with flammable liquids; avoid PVC or polyethylene for prolonged storage
Occupational Exposure Limits: OSHA PEL: 100 ppm (TWA); ACGIH TLV: 20 ppm (TWA), 40 ppm (STEL)
Engineering Controls: Use local exhaust ventilation; provide safety showers and eye wash stations; monitor airborne levels regularly
Eye Protection: Chemical splash goggles; use face shield for high-risk activities
Skin Protection: Impervious gloves (nitrile, neoprene), flame-resistant laboratory coat or apron
Respiratory Protection: NIOSH-approved respirator for concentrations above exposure limits or inadequate ventilation; full-face supplied air respirator in emergencies
General Hygiene: Wash hands and face after handling; remove contaminated clothing and wash before reuse; follow strict housekeeping protocols to prevent accumulation of residues
Appearance: Clear, colorless to slightly yellow liquid
Odor: Sweet, aromatic
Odor Threshold: 0.1–0.85 ppm
pH: Not applicable (non-aqueous)
Melting Point: -30.6°C
Boiling Point: 145°C
Decomposition Temperature: Above 200°C
Flash Point: 31°C
Evaporation Rate: 0.49 (n-butyl acetate = 1.0)
Flammability: Highly flammable
Vapor Pressure: 6.4 mmHg at 20°C
Vapor Density: 3.6 (air = 1)
Relative Density: 0.91 g/cm3 at 20°C
Solubility: Slightly soluble in water (0.3 g/L at 20°C); miscible with most organic solvents
Partition Coefficient n-octanol/water (log Kow): 2.95–3.16
Explosive Properties: Not explosive as sold, but vapor/air mixtures can explode
Viscosity: 0.76 mPa·s at 25°C
Other Data: May undergo hazardous polymerization unless inhibitor is present
Chemical Stability: Stable under recommended storage conditions; sensitive to light, heat, and contamination
Polymerization Risk: Risk of hazardous polymerization if not stabilized; inhibitors like tert-butylcatechol commonly used
Incompatible Materials: Avoid contact with strong acids, oxidizing agents, halogens, alkali metals, peroxides
Hazardous Decomposition Products: Produces carbon monoxide, carbon dioxide, phenol, and other aromatic compounds during burning or decomposition
Reactive Hazard: Heating, contact with peroxides or elevated temperature accelerates dangerous polymerization; releases heat and fumes
Specific Conditions to Avoid: Exposure to heat, sunlight, sparks; mechanical shock; storing without inhibitor; lack of oxygen in storage increases polymerization risk
Acute Toxicity: Inhalation – LC50 (rat, 4h): 11.8 mg/L; oral – LD50 (rat): 5,000 mg/kg; dermal – LD50 (rabbit): >2,000 mg/kg
Routes of Exposure: Inhalation, skin and eye contact, ingestion
Immediate Health Effects: Eye and skin irritation, respiratory discomfort, nausea, drowsiness, dizziness, confusion
Chronic Effects: Prolonged or repeated exposure linked to central nervous system effects (headache, concentration problems), potential liver damage; classified as “possibly carcinogenic to humans” by IARC (Group 2B)
Allergic Sensitization: No strong evidence, but skin irritation possible in sensitive individuals
Mutagenicity: Not considered mutagenic in standard tests
Reproductive Toxicity: Limited evidence of impacts on reproduction in animal studies only
Other Toxicological Data: High doses may suppress bone marrow or immune responses in animals; not well documented in humans
Aquatic Toxicity: Harmful to aquatic organisms; LC50 (fish, 96h): 4.02 mg/L (fathead minnow)
Persistence and Degradability: Moderately persistent; degraded in air and water by photolysis and biodegradation; half-life in surface water estimated at less than 2 weeks
Bioaccumulative Potential: Moderate potential (log Kow 2.95–3.16); biomagnification unlikely
Mobility: Low mobility in soil; volatilizes rapidly from water and soil surfaces
Other Adverse Effects: Toxic to aquatic invertebrates, potential to cause long-term adverse effects in aquatic environments
Precautionary Measures: Avoid release to environment; monitor effluent and comply with local regulations for discharges
Waste Methods: Dispose in accordance with local, regional, and national regulations for hazardous chemical waste; do not discharge to drains, sewers or environment
Incineration: Preferred method; use proper emission controls at approved incineration facilities
Recycling: Recover if possible in a permitted chemical plant using safe handling practices
Container Disposal: Completely empty and triple rinse containers prior to disposal or recycling; puncture and dispose of as hazardous waste
Special Precautions: Do not attempt to neutralize or treat large spills without professional advice; label disposed chemicals clearly
UN Number: UN 2055
Proper Shipping Name: Styrene monomer, stabilized
Transport Hazard Class: 3 (Flammable liquid)
Packing Group: III
Labels Required: Flammable liquid label on all packaging and transport documents
Marine Pollutant: Yes
Special Precautions for Transport: Transport in compliance with ADR/RID, IMDG, IATA/DGR; strictly control temperature; verify inhibitor present; avoid exposure to sunlight and sources of ignition; ensure all vessels and containers are properly grounded and sealed
OSHA Status: Listed as hazardous; subject to mandatory hazard communication
TSCA (US): Listed
REACH (EU): Registered; subject to restrictions under Annex XVII
DSL/NDSL (Canada): Listed
AICS (Australia): Listed
IARC Classification: Group 2B, possibly carcinogenic to humans
SARA Title III Sections 302/304: Not listed as an extremely hazardous substance
SARA Title III Section 313: Subject to reporting
EPA Hazard Category: Immediate (acute) health hazard, delayed (chronic) health hazard, fire hazard
Other Standards: Covered under Clean Air Act Hazardous Air Pollutants; RCRA hazardous waste; subject to community right-to-know reporting for usage and storage above thresholds
