Styrene CAS #100-42-5
1. Versatile Industrial Use: Styrene is a key monomer in the production of synthetic resins, ion exchange resins, and synthetic rubber, making it essential in various manufacturing processes.
2. Stable and Adjustable: While styrene is air-sensitive, it is typically shipped with inhibitors to prevent polymerization, ensuring stability during storage and transportation.
3. Unique Physical Properties: With a low freezing point of -31°C and a boiling point of 145°C, styrene is suitable for a range of applications in different temperature environments.
4. Solubility and Reactivity: Styrene is soluble in ethanol and ether, and undergoes typical olefin addition reactions, allowing it to be used in a variety of chemical processes.
Styrene is an organic compound created by substituting one hydrogen atom of ethylene with a benzene ring. The electrons of the vinyl group conjugate with the benzene ring, making it an aromatic hydrocarbon. Its molecular formula is C8H8, and the structural formula is C6H5CH=CH2. Found naturally in storax, it is a colorless, oily liquid with a distinct aroma.
Styrene has a melting point of -30.6°C, a boiling point of 145.2°C, a relative density of 0.9060 (at 20/4°C), and a refractive index of 1.5469. Its viscosity is 0.762 cP at 68°F. While it is insoluble in water, it dissolves in ethanol and ether. When exposed to air, it gradually polymerizes and oxidizes. To prevent this, inhibitors such as hydroquinone or tert-butyl catechol (0.0002%-0.002%) are added as stabilizers before storage. Styrene is a key monomer in the production of synthetic resins, ion exchange resins, and synthetic rubber. It can also undergo addition reactions typical of olefins.
Parameters
Melting point | -31 °C (lit.) |
Boiling point | 145-146 °C (lit.) |
density | 0.906 g/mL at 25 °C |
vapor density | 3.6 (vs air) |
vapor pressure | 12.4 mm Hg ( 37.7 °C) |
refractive index | n20/D 1.546(lit.) |
Fp | 88 °F |
storage temp. | Store at <= 20°C. |
solubility | 0.24g/l |
form | Liquid |
pka | >14 (Schwarzenbach et al., 1993) |
Specific Gravity | 0.909 |
color | Colorless |
Odor | at 0.10 % in triacetin. sweet balsam floral plastic |
Odor Type | balsamic |
biological source | synthetic |
Odor Threshold | 0.035ppm |
explosive limit | 1.1-8.9%(V) |
Water Solubility | 0.3 g/L (20 ºC) |
FreezingPoint | -30.6℃ |
Sensitive | Air Sensitive |
Merck | 14,8860 |
BRN | 1071236 |
Henry's Law Constant | (x 10-3 atm?m3/mol): 3.91 at 25 °C (static headspace-GC, Welke et al., 1998) |
Exposure limits | TLV-TWA 50 ppm (～212 mg/m3) (ACGIH and NIOSH), 100 ppm (～425 mg/m3) (OSHA and MSHA); ceiling 200 ppm, peak 600 ppm/5 min/3 h (OSHA); STEL 100 ppm （～425 mg/m3) (ACGIH). |
Dielectric constant | 2.4300000000000002 |
Dielectric constant | 2.4（25℃） |
Stability: | Stable, but may polymerize upon exposure to light. Normally shipped with a dissolved inhibitor. Substances to be avoided include strong acids, aluminium chloride, strong oxidizing agents, copper, copper alloys, metallic salts, polymerization catalysts and accelerators. Flammable - vapour may travel considerable distance to ignition source |
InChIKey | PPBRXRYQALVLMV-UHFFFAOYSA-N |
LogP | 2.96 at 25℃ |
CAS DataBase Reference | 100-42-5(CAS DataBase Reference) |
NIST Chemistry Reference | Styrene(100-42-5) |
IARC | 2A (Vol. 60, 82, 121) 2019 |
EPA Substance Registry System | Styrene (100-42-5) |
Safety Information
Hazard Codes | Xn,T,F |
Risk Statements | 10-20-36/38-40-36/37/38-39/23/24/25-23/24/25-11-48/20-63 |
Safety Statements | 23-36-26-16-45-36/37-7-46 |
RIDADR | UN 2055 3/PG 3 |
OEB | A |
OEL | TWA: 50 ppm (215 mg/m3), STEL: 100 ppm (425 mg/m3) |
WGK Germany | 2 |
RTECS | WL3675000 |
Autoignition Temperature | 914 °F |
TSCA | Yes |
HS Code | 2902 50 00 |
HazardClass | 3 |
PackingGroup | III |
Hazardous Substances Data | 100-42-5(Hazardous Substances Data) |
Toxicity | LD50 in mice (mg/kg): 660 ± 44.3 i.p.; 90 ± 5.2 i.v. |
IDLA | 700 ppm |
