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Skeletal formula
Ball-and-stick model
IUPAC name
Other names
α-Methylstyrene; 2-Phenyl-1-propene; 1-Methyl-1-phenylethylene; 2-Phenylpropene; (1-Methylethenyl)benzene; beta-Phenylpropene; 2-Phenylpropylene; beta-Phenylpropylene; alpha-Methylstyrol; 1-Phenyl-1-methylethylene; 2-Phenyl-2-propene
3D model (JSmol)
Abbreviations AMS
ECHA InfoCard 100.002.459
Molar mass 118.18 g·mol−1
Appearance Colorless liquid
Density 0.91 g/cm3
Melting point −24 °C (−11 °F; 249 K)
Boiling point 165 to 169 °C (329 to 336 °F; 438 to 442 K)
Vapor pressure 2 mmHg (20 °C)[1]
-80.1·10−6 cm3/mol
NFPA 704
Flammability code 0: Will not burn. E.g., water Health code 3: Short exposure could cause serious temporary or residual injury. E.g., chlorine gas Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
Flash point 45 °C (113 °F; 318 K)
Explosive limits 1.9–6.1%[1]
Lethal dose or concentration (LD, LC):
4900 mg/kg (oral, rat)[2]
US health exposure limits (NIOSH):
PEL (Permissible)
C 100 ppm (480 mg/m3)[1]
REL (Recommended)
TWA 50 ppm (240 mg/m3) ST 100 ppm (485 mg/m3)[1]
IDLH (Immediate danger)
700 ppm[1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
YesY verify (what is YesYN ?)
Infobox references

α-Methylstyrene (AMS) is a chemical intermediate used in the manufacture of plasticizers, resins and polymers.[3] It is a co-product formed in a variation of the cumene process, the homopolymer obtained from this monomer, poly(α-methylstyrene), is unstable, being characterized by a low ceiling temperature.[4]


  1. ^ a b c d e "NIOSH Pocket Guide to Chemical Hazards #0429". National Institute for Occupational Safety and Health (NIOSH). 
  2. ^ "alpha-Methyl styrene". Immediately Dangerous to Life and Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH). 
  3. ^ What is alpha-methylstyrene (AMS)?
  4. ^ Stevens, Malcolm P. (1999). "6". Polymer Chemistry an Introduction (3rd ed.). New York: Oxford University Press. pp. 193–194. ISBN 978-0-19-512444-6.