Styrene
CAS 100-42-5C8H8104.15 g/mol
Styrene is a vinylarene that is benzene carrying a vinyl group. It has been isolated from the benzoin resin produced by Styrax species. It has a role as a mutagen, a mouse metabolite and a plant metabolite. It is a volatile organic compound, a member of styrenes and a vinylarene.
IUPAC: styrene
PubChem
Physical & Chemical Properties
| Melting Point | -24 to -23 °F (NTP, 1992) |
| Boiling Point | 293 to 295 °F at 760 mmHg (NTP, 1992) |
| Density | 0.906 at 68 °F (USCG, 1999) - Less dense than water; will float |
| Solubility | less than 1 mg/mL at 66 °F (NTP, 1992) |
| Flash Point | 88 °F (NTP, 1992) |
| Vapor Pressure | 4.3 mmHg at 59 °F ; 9.5 mmHg at 86 °F; 10 mmHg at 95 °F (NTP, 1992) |
| Appearance | Styrene monomer, stabilized appears as a clear colorless to dark liquid with an aromatic odor. Vapors heavier than air and irritating to the eyes and mucous membranes. Subject to polymerization. If the polymerization takes place inside a closed container, the container may rupture violently. Less dense than water and insoluble in water. Used to make plastics, paints, and synthetic rubber. |
Data: PubChem · Last updated: 4/20/2026
GHS Classification
No GHS classification data available.
Classification data is sourced from ECHA.
Regulatory Compliance
TSCA
Listed
note: Status based on EPA TSCA Active Inventory · inventory name: TSCA Chemical Substance Inventory
View sourceGlobal Trade Intelligence
No trade flow data available for this chemical.
HS Code(s): 2902
Data: UN Comtrade
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