ChemicalBook >> CAS DataBase List >>2-Phenyl-1-propene


Chemical Name:
AMS;Α-METHYLSTYRENE;ALPHA-METHYLSTYRENE;2-PHENYLPROPENE;A-METHYL STYRENE;ISOPROPENYLBENZENE;(1-Methylethenyl)benzene;à-methylstyrene;(1-methylethenyl)-benzen;Benzene, (1-methylethenyl)-
Molecular Formula:
Molecular Weight:
MOL File:
MSDS File:

2-Phenyl-1-propene Properties

Melting point −24 °C(lit.)
Boiling point 165-169 °C(lit.)
Density 0.909 g/mL at 25 °C(lit.)
vapor density 4.1 (vs air)
vapor pressure 2.1 mm Hg ( 20 °C)
refractive index n20/D 1.539
Flash point 114 °F
storage temp. 2-8°C
solubility 560mg/l
form Liquid
color Clear colorless
PH 5-6 (500g/l, H2O)
explosive limit 0.9-6.6%(V)
Water Solubility insoluble
BRN 969405
Exposure limits NIOSH REL: TWA 50 ppm (240 mg/m3), STEL 100 ppm (485 mg/m3), IDLH 700 ppm; OSHA PEL: ceiling 100 ppm; ACGIH TLV: TWA 50 ppm, STEL 100 ppm (adopted).
CAS DataBase Reference 98-83-9(CAS DataBase Reference)
Indirect Additives used in Food Contact Substances ALPHA-METHYLSTYRENE
FDA 21 CFR 175.300; 175.320; 177.1010; 177.2420; 178.3790
EWG's Food Scores 1
IARC 2B (Vol. 101) 2013
NIST Chemistry Reference «alpha»-Methylstyrene(98-83-9)
EPA Substance Registry System .alpha.-Methylstyrene (98-83-9)


Risk and Safety Statements

Signal word  Warning
Hazard statements  H304-H315-H351-H371-H373-H226-H319-H335-H411-H401
Precautionary statements  P201-P202-P210-P233-P240-P241+P242+P243-P260-P264-P270-P271-P280-P301+P310+P331-P302+P352+P332+P313+P362+P364-P304+P340+P312-P305+P351+P338+P337+P313-P308+P311-P273-P305+P351+P338-P370+P378-P391-P403+P235-P501-P261-P303+P361+P353-P405-P501a
Hazard Codes  Xi,N
Risk Statements  10-36/37-51/53
Safety Statements  61
RIDADR  UN 2303 3/PG 3
WGK Germany  2
RTECS  WL5075300
Autoignition Temperature 445 °C
HS Code  2902 90 00
HazardClass  3
PackingGroup  III
Toxicity LD50 orally in Rabbit: 4900 mg/kg
IDLA 700 ppm
NFPA 704
1 1

2-Phenyl-1-propene price More Price(18)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich M80903 α-Methylstyrene 99%, contains 15 ppm p-tert-butylcatechol as inhibitor 98-83-9 1l $51.7 2022-05-15 Buy
Sigma-Aldrich 8.06086 α-Methylstyrene (stabilisedwith4-tert-butylpyrocatechol)forsynthesis 98-83-9 100mL $25.1 2022-05-15 Buy
Sigma-Aldrich 8.06086 α-Methylstyrene (stabilisedwith4-tert-butylpyrocatechol)forsynthesis 98-83-9 1L $46.2 2022-05-15 Buy
Sigma-Aldrich 69168 α-Methylstyrene monomer analytical standard 98-83-9 1ml $38.8 2022-05-15 Buy
TCI Chemical M0429 alpha-Methylstyrene (stabilized with TBC) >99.0%(GC) 98-83-9 25mL $20 2022-04-27 Buy
Product number Packaging Price Buy
M80903 1l $51.7 Buy
8.06086 100mL $25.1 Buy
8.06086 1L $46.2 Buy
69168 1ml $38.8 Buy
M0429 25mL $20 Buy

2-Phenyl-1-propene Chemical Properties,Uses,Production

Chemical Properties

Methylstyrene is a colorless liquid with a characteristic odor.

Chemical Properties

clear colourless liquid

Physical properties

Colorless liquid with a sharp aromatic odor. Odor threshold concentration is 290 ppb (quoted, Amoore and Hautala, 1983).


α-Methylstyrene is not a styrenic monomer in the strict sense. The methyl substitution on the side chain, rather than the aromatic ring, moderates its reactivity in polymerization. It is used as a specialty monomer in ABS resins, coatings, polyester resins, and hot-melt adhesives. As a copolymer in ABS and polystyrene, it increases the heat-distortion resistance of the product. In coatings and resins, it moderates reaction rates and improves clarity.


Intermediate for ABS plastics, Styrene - Butadiene rubber, Polystyrene, Styrene - Acrylonitrile Resins, Perfumery, Polyalphamethyl Styrene, Polyester resins


Polymerization monomer, especially forpolyesters.

Production Methods

α-Methylstyrene (AMS) is produced as a by-product in the production of phenol and acetone from cumene.

Synthesis Reference(s)

Journal of the American Chemical Society, 108, p. 1322, 1986 DOI: 10.1021/ja00266a047
Tetrahedron Letters, 21, p. 2531, 1980 DOI: 10.1016/0040-4039(80)80120-1
Synthesis, p. 1034, 1987 DOI: 10.1055/s-1987-28164

General Description

A colorless liquid. Insoluble in water and less dense than water. Flash point 115°F. May be mildly toxic by ingestion, inhalation and skin absorption. Vapors may be narcotic by inhalation. Used as a solvent and to make other chemicals.

Air & Water Reactions

Flammable. Oxidizes readily in air to form unstable peroxides that may explode spontaneously [Bretherick, 1979 p.151-154, 164]. Insoluble in water.

Reactivity Profile

2-Phenyl-1-propene is easily peroxidizable; the peroxide may initiate exothermic polymerization of the bulk material. Reacts violently with strong oxidizing agents [Handling Chemicals Safely, 1980 p. 866; Bretherick, 1979 p. 160].


Moderate fire risk. Explosive limits in air1.9–6.1%. Avoid inhalation and skin contact. Upperrespiratory tract irritant, kidney and female repro-ductive damage. Possible carcinogen.

Health Hazard

Inhalation causes irritation of respiratory tract, headache, dizziness, light-headedness, and breathlessness. Ingestion causes irritation of mouth and stomach. Contact with liquid irritates eyes. Prolonged skin contact can cause severe rashes, swelling, and blistering.

Safety Profile

Mildly toxic by inhalation. Human systemic effects by inhalation: irritant effects. A skin and eye irritant. Flammable when exposed to heat or flame; can react vigorously with oxidizing materials. When heated to decomposition it emits acrid smoke and irritating fumes.

Potential Exposure

Methylstyrene is used as additive, plasticizer, and copolymer; used in the production of modified polyester and alkyd resin formulations.

Environmental Fate

Chemical/Physical. Polymerizes in the presence of heat or catalysts (Hawley, 1981).


UN2303 Isopropenylbenzene, Hazard Class: 3; Labels: 3-Flammable liquid

Purification Methods

Wash the monomer three times with aqueous 10% NaOH (to remove inhibitors such as quinol), then six times with distilled water, dry with CaCl2 and distil it unde


Vapors may form explosive mixture with air. Incompatible with oxidizers (chlorates, nitrates, peroxides, permanganates, perchlorates, chlorine, bromine, fluorine, etc.); contact may cause fires or explosions. Keep away from alkaline materials, strong bases, strong acids, oxoacids, epoxides, peroxides, halogens, catalysts for vinyl or ionic polymers; aluminum, iron chloride; copper. Methylstyrene may form unstable peroxides; may polymerize. Usually contains an inhibitor, such as tert-butyl catechol.

Waste Disposal

ncineration, often by admixture with a more flammable solvent

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View Lastest Price from 2-Phenyl-1-propene manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2022-05-24 2-Phenyl-1-propene
US $1.50 / g 1g 99.0% Min 100 Tons Shaanxi Didu New Materials Co. Ltd
2022-05-19 2-Phenyl-1-propene
US $1.50 / g 1g 99.0% Min 100 Tons Shaanxi Didu New Materials Co. Ltd
2022-03-17 α-Methylstyrene
US $50.00 / KG 10KG 99 1000kg Hebei Yime New Material Technology Co., Ltd.
  • α-Methylstyrene
  • US $50.00 / KG
  • 99
  • Hebei Yime New Material Technology Co., Ltd.
(1-methyl-ethenyl)-benzene 1-methyl-1-phenylethene 1-Methyl-1-phenylethylene 1-methylethenyl-Benzene 1-methylethenylbenzine 1-methylethylenebenzene 1-Phenyl-1-methylethylene 1-Propene, 2-phenyl- 2-phenyl-1-propen 2-Phenyl-2-propene 2-Phenylpropylene alpha-methyl alpha-Methylstyreen alpha-methyl-styren alpha-Methylstyrol alpha-methyl-styrol alpha-Metil-stirolo AS-Methylphenylethylene Benzene, isopropenyl- benzene,(1-methylethenyl)- benzene,(1-methylethyl)- Benzene,1-methylethenyl- beta-phenylpropene beta-Phenylpropylene Isopropenil-benzolo Isopropenyl-benzeen Isopropenyl-benzol Ortho brush killer a Styrene, alpha-methyl- styrene,α-methyl- 2-PHENYL-1-PROPENE α-Menthylstyrene ALPHA-METHYLSTYRENE MONOMER, STAB. ALPHA-METHYLSTYRENE MONOMER, STANDARD FO R GC, STAB. alpha-Methylstyrene,99%,stab.with10-20ppm4-tert-butylcatechol alpha-Methylstyrene, stabilized, 99% ɑ-Methylstyrene, 99%, stab. with 10-20 ppm 4-tert-butylcatechol alpha-Methylstyrene (stabilized with TBC) (1-Methylvinyl)benzol 2-phenylpropene α-methylstryene 2-Phenylpropene, Isopropenylbenzene Alpha-methylstyrene, 99%, stabilized (1-Methylvinyl)benzene 1-Methylvinylbenzene ^a-Methylstyrene, 99%, stab. with 10-20 ppm 4-tert-butylcatechol α-Methylphenylene α-Methylstyrene monomer,2-Phenylpropene, Isopropenylbenzene α-Methylstyrene,2-Phenylpropene, Isopropenylbenzene alpha-Methylstyrene, Stabilized with 10-20 ppM tert-Butyl Catechol alpha-Methylstyrene 99%, contains 15 ppM p-tert-butylcatechol as inhibitor alpha-Methylst ALPHA-METHYLSTYRENE , STABILIZED WITH 10-20 PPM 4-TERT-BUTYLCATECHOL alpha-Methylstyrene  alpha-Methylstyrene, stabilized, 99% 100GR Isopropenylbenzene 2-Phenyl-1-propene A-METHYLSTYRENE (STABILISED WITH 4-TERT- alpha-Methylstyrene, stabilized with 10 to 20ppm 4-tert-butylcatechol α-Methylstyrene, Stabilized