Properties of Styrene (C8H8)

Styrene is a colorless, flammable liquid hydrocarbon compound with the chemical formula C8H8. It is derived from petroleum and is used primarily in the production of plastics and synthetics.

The following table provides a comprehensive list of styrene properties in both SI and US customary/Imperial units at normal temperature and pressure (NTP).

Click on the icon to switch between Metric and Imperial units.

Table of Styrene Properties
Physical Properties
Metric
Molar Mass104.15 g/mol
Density906 kg/m3
Dynamic Viscosity0.781 mPa·s
Surface Tension32.3 mN/m
Thermal PropertiesMetric
Melting Point-30.7 °C
Boiling Point145.2 °C
Thermal Conductivity (25°C)0.137 W/m·K
Vapor Pressure0.67 kPa
Critical ConstantsMetric
Critical Temperature (Tc)362 °C
Critical Pressure (Pc)3.9 MPa
Critical Molar Volume (Vc)357 cm3/mol
Electrical PropertiesMetric
Relative Permittivity (εr)2.474
Optical PropertiesMetric
Refractive Index (589 nm) (25°C)1.544
Hazardous DataMetric
Flash Point31 °C
Autoignition Temperature490 °C
Lower Flammability Limit0.9%
Upper Flammability Limit6.8%
NFPA Rating (Health)2
NFPA Rating (Fire)3
NFPA Rating (Reactivity)2

Unless stated otherwise, all values are taken at room temperature (approximately 20°C or 68°F) and 1 atm pressure. (1 atm = 101,325 Pa)

References: 1) Cardarelli, François. Materials Handbook: A Concise Desktop Reference. Switzerland: Springer International Publishing, 2018. 2) CRC Handbook of Chemistry and Physics, 97th Edition. United Kingdom: CRC Press, 2016-2017. 3) Yaws, Carl L. The Yaws Handbook of Physical Properties for Hydrocarbons and Chemicals. Netherlands: Elsevier Science, 2015. 4) Fire Protection Guide to Hazardous Materials, 14th Edition. United States: National Fire Protection Association, 2010.