Alpha-methylstyrene
CAS 98-83-9
EC 202-705-0
Formula C9H10
MW 118.18 g/mol
Monomers & Building Blocks Plastics & PolymersCoatings, Adhesives, Sealants & ElastomersPrinting & PackagingPersonal Care & Cosmetics Polymerization InitiationFlavoring & AcidulantAntioxidant & Stabilizer
Description
Alpha-methylstyrene (AMS), also known as 2-phenylpropene and α-Methylstyrol, is a vinyl aromatic monomer with CAS 98-83-9 and EC 202-705-0. It carries no assigned E-code. The compound is commercially available under several designations and is classified within the monomers and building blocks category.
In polymer production, AMS acts as a chain-transfer agent and co-monomer in AMS-ABS and styrene-acrylonitrile systems, moderating molecular weight and raising heat deflection temperatures. In antioxidant synthesis, it serves as a reactive intermediate for producing hindered phenolic stabilizers used in coatings and adhesive formulations. It also contributes fragrance character in select personal care applications.
Alpha-methylstyrene is supplied in liquid form and falls under REACH regulation (EC 1907/2006), requiring compliant safety documentation for EU trade. Standard packaging includes bulk isotanks and IBC containers. Procurement teams should confirm inhibitor content and purity grade specifications prior to ordering, as these vary by application.
In polymer production, AMS acts as a chain-transfer agent and co-monomer in AMS-ABS and styrene-acrylonitrile systems, moderating molecular weight and raising heat deflection temperatures. In antioxidant synthesis, it serves as a reactive intermediate for producing hindered phenolic stabilizers used in coatings and adhesive formulations. It also contributes fragrance character in select personal care applications.
Alpha-methylstyrene is supplied in liquid form and falls under REACH regulation (EC 1907/2006), requiring compliant safety documentation for EU trade. Standard packaging includes bulk isotanks and IBC containers. Procurement teams should confirm inhibitor content and purity grade specifications prior to ordering, as these vary by application.
Physical Properties
| Melting Point | -23.2 °C |
| Boiling Point | 165.4 °C |
| Density | 0.9106 g/cm³ |
| Flash Point | 114 °F |
| Appearance | Methylstyrene is a colorless liquid with a characteristic odor. |
| Color | Clear colorless |
| Form | Liquid |
| Water Solubility | insoluble |
| Vapor Pressure | 2.1 mm Hg ( 20 °C) |
| Refractive Index | n 20/D 1.539 |
| pH | 5-6 (500g/l, H2O) |
| Log P | 3.48 at 25℃ |
Safety & Handling (Learn More)
Warning GHS02 GHS07 GHS09 GHS05 GHS08
H
H226H303H304H315H318H319H320H335H336H341H351H361H371H372H373H401H411
P
P203P210P233P240P241P242P243P260P261P264P270P271P273P280P317P318P319P321P331P391P405P501P264+P265P301+P316P301+P317P302+P352P304+P340P308+P316P332+P317P337+P317P362+P364P370+P378P403+P233P403+P235P303+P361+P353P305+P351+P338P305+P354+P338
Trade & Regulatory
| HS Code | 29029090 |
| UN Number | 2303 |
| ADR Class | 3 |
| Packing Group | III |
| Storage Class | 3 - Flammable liquids |
| WGK (Germany) | 2 |
Other Names
Α-Methylstyreneprop-1-en-2-ylbenzene2-phenylpropane2-PhenylpropeneAMSα-Methylstyrol
Related Products
Raw Materials
Derivatives
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