What Is Styrene Monomer
Styrene (styrene monomer) is a colorless, transparent liquid chemical with the molecular formula C8H8. It is an organic solvent insoluble in water at room temperature. Due to its unique chemical structure and properties, styrene is widely used in the synthesis of resins, plastics, rubber, coatings and other fields, and it is an important chemical raw material used in the production of various chemical products.
The Specification Table
The industrial grade of styrene is specified by its purity and impurity limits. The styrene content is at least 99.5 percent, with ethylbenzene at 0.20 percent maximum, toluene at 0.05 percent maximum, benzene at 0.02 percent maximum, aldehydes as benzaldehyde at 0.01 percent maximum and polymer content at 10 mg/kg maximum. The inhibitor TBC is maintained at 10 to 15 ppm or as required. The density is about 0.909 g/cm³, the boiling point about 145 degrees, the melting point minus 30.6 degrees and the flash point about 31 degrees closed cup.
Why the Impurity Limits Matter
The impurity limits are set to protect the polymerization process and the quality of the polymer. Ethylbenzene and other hydrocarbons act as diluents that slow the polymerization, aldehydes poison the catalyst systems and the polymer content indicates premature polymerization. The inhibitor is added to prevent polymerization during storage and transport, and its level is maintained through the supply chain.
Physical Properties
Styrene is slightly soluble in water and miscible with most organic solvents. Its density and boiling point are defined by the specification, and its low melting point means it remains liquid under normal storage conditions. The low flash point classifies it as a flammable liquid requiring strict fire precautions.
Applications of Styrene
The primary use of styrene is as a monomer for producing polystyrene and other polymers. Polystyrene is an inexpensive and versatile plastic used in packaging materials, disposable tableware and appliance housings. Styrene is also employed in producing styrene-butadiene rubber for tires and industrial rubber products, and it serves as a precursor for engineering plastics such as SAN and ABS used in automotive, electronics and home appliance sectors.
Frequently Asked Questions
What is the purity of industrial styrene? t least 99.5 percent styrene content.
What is the inhibitor? TBC at 10 to 15 ppm, maintained through storage and transport.
Why are impurity limits important? They protect the polymerization process and polymer quality.
What is the flash point of styrene? about 31 degrees closed cup.
What is styrene used for? Polystyrene, SBR rubber and engineering plastics such as ABS.