| Formula / Notation | (C8H8)n |
|---|---|
| CAS Number | 9003-53-6 |
| Molecular Weight | Variable (polymer) |
| Melting Point | ~240 °C (softens ~100 °C) |
| Boiling Point | Decomposes ~300 °C |
| Density | 1.04–1.09 g/cm³ |
| Solubility | Insoluble in water |
| Appearance | clear colourless solid (or white foam) |
| Also Known As | PS; crystal polystyrene; expanded polystyrene; EPS; styrofoam |
| Category | Polymers & Plastics |
What is Polystyrene?
Polystyrene (PS) is a synthetic aromatic hydrocarbon polymer made from styrene monomers (–CH₂–CH(C₆H₅)–)n. It is one of the most widely used plastics globally and can be manufactured as a rigid solid or as a foam (expanded polystyrene, EPS). Its glass transition temperature is approximately 100 °C, above which it becomes soft and moldable. Polystyrene is transparent in its standard form and is easily coloured or modified with additives.
Formula & Notation
IUPAC Name: poly(styrene)
Other Names / Synonyms: PS; crystal polystyrene; expanded polystyrene; EPS; styrofoam
Properties & Characteristics
Physical Data
| Property | Value |
|---|---|
| Melting Point | ~240 °C (softens ~100 °C) |
| Boiling Point | Decomposes ~300 °C |
| Density | 1.04–1.09 g/cm³ |
| Molecular Weight | Variable (polymer) |
| Solubility | Insoluble in water |
| Appearance | clear colourless solid (or white foam) |
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
Polystyrene (PS) is a synthetic aromatic hydrocarbon polymer made from styrene monomers (–CH₂–CH(C₆H₅)–)n. It is one of the most widely used plastics globally and can be manufactured as a rigid solid or as a foam (expanded polystyrene, EPS). Its glass transition temperature is approximately 100 °C, above which it becomes soft and moldable. Polystyrene is transparent in its standard form and is easily coloured or modified with additives.
Disposable food packaging, cups, and containers. Insulation foam (EPS/XPS). Laboratory Petri dishes and cell culture plates. Model making and crafts. CD/DVD cases. Electrical insulation components.
Considered low acute toxicity in solid form. Releases toxic styrene monomer and other compounds when burned. EPS foam is an environmental concern — difficult to recycle. Styrene is a potential carcinogen. Consult SDS before processing.
The formula or notation for Polystyrene is: (C8H8)n