Description

Methylstyrene, Mixed Isomers CAS NO 1321-45-5 is a versatile aromatic monomer consisting primarily of meta- and para-methylstyrene isomers. This compound is valued for its ability to enhance polymer properties, offering improved thermal stability, chemical resistance, and processing characteristics. It is a critical raw material for manufacturers in the polymer, resin, and specialty chemical industries seeking to modify and upgrade material performance.

Application

• Polymer Modification: Acts as a reactive diluent and comonomer in the production of unsaturated polyester resins (UPR) and vinyl ester resins.
• Specialty Adhesives & Sealants: Used to formulate high-performance adhesives with enhanced flexibility and environmental resistance.
• Coatings & Inks: Imparts superior durability, gloss, and drying properties in industrial and decorative coatings, as well as printing inks.
• Synthetic Rubber & Elastomers: Serves as a monomer in the synthesis of specialty rubbers, improving oil and heat resistance.
• Chemical Intermediate: A key building block for the synthesis of more complex chemical derivatives used in fragrances, agrochemicals, and pharmaceuticals.
• Composite Materials: Enhances the mechanical properties and processability of fiber-reinforced plastics (FRP) and other composite systems.

Basic Information

Product Name	Methylstyrene, Mixed Isomers
CAS No.	1321-45-5
Molecular Formula	C9H10
Molecular Weight	118.18 g/mol
Synonyms	Vinyltoluene, Mixed Isomers; Methylstyrene; m/p-Methylstyrene; Tolyl ethylene; (3-Methylphenyl)ethene & (4-Methylphenyl)ethene; α-Methylstyrene (Note: distinct isomer); MPS; Toluene, vinyl-
EINECS	215-332-7

Quality Control

Our Methylstyrene, Mixed Isomers is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing, including gas chromatography (GC) for isomer distribution and purity, to ensure it meets precise customer and industry specifications. A Certificate of Analysis (COA) detailing all critical parameters is provided with each shipment to guarantee traceability and consistent quality.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, well-ventilated area away from heat, sparks, and open flame. Due to its highly volatile and easily oxidized nature, it is recommended to store under an inert atmosphere (e.g., nitrogen) and keep containers tightly sealed when not in use. Recommended storage temperature is 15-25°C.

Specification

Item	Specification
Appearance	Clear, colorless to pale yellow liquid
Identification (IR)	Conforms
Assay (GC, Total Methylstyrenes)	≥ 99.0 %
Isomer Distribution (m/p Ratio)	Typical 60/40 (Customizable)
α-Methylstyrene (max)	≤ 0.5 %
Ethylbenzene (max)	≤ 0.2 %
Peroxide (as H2O2) (max)	≤ 100 ppm
Inhibitor (TBC, typical)	10 - 50 ppm
Water (KF)	≤ 0.05 %
Specific Gravity (20/20°C)	0.895 - 0.905
Refractive Index (n20/D)	1.538 - 1.542

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.