Forms Produced
| Properties | |
|---|---|
| Density of EPS | 16–640 kg/m3 |
| Young's modulus (E) | 3000–3600 MPa |
| Tensile strength (st) | 46–60 MPa |
| Elongation at break | 3–4% |
| Notch test | 2–5 kJ/m2 |
| Glass transition temperature | 100 °C |
| Vicat B | 90 °C |
| Linear expansion coefficient (a) | 8×10−5 /K |
| Specific heat (c) | 1.3 kJ/(kg·K) |
| Water absorption (ASTM) | 0.03–0.1 |
| Decomposition | X years, still decaying |
Polystyrene is commonly injection molded or extruded, while expanded polystyrene is either extruded or molded in a special process. Polystyrene copolymers are also produced; these contain one or more other monomers in addition to styrene. In recent years the expanded polystyrene composites with cellulose and starch have also been produced.
Extruded closed-cell polystyrene foam is sold under the trademark Styrofoam by Dow Chemical. This term is often used informally for other foamed polystyrene products.
Polystyrene is used in some polymer-bonded explosives (PBX):
| Name | Explosive ingredients | Binder ingredients |
|---|---|---|
| PBX-9205 | RDX 92% | Polystyrene 6%; DOP 2% |
| PBX-9007 | RDX 90% | Polystyrene 9.1%; DOP 0.5%; resin 0.4% |
Read more about this topic: Polystyrene
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