Expanded polystyrene was the first foamed polymer. It is the white rigid plastic used for thermal insulation and in flotation devices.
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| Density | 1050 (Expanded 30) | kgm-3 | Clip |
| Melting Point | 360 | K | Clip |
| Tensile strength | 50000000 | Nm-2 | Clip |
| Youngs modulus | 3100000000 | Nm-2 | Clip |
| Linear expansivity | 0.00007 | K-1 | Clip |
| Specific heat capacity | 1300 | Jkg-1K-1 | Clip |
| Thermal conductivity | 0.08 (Expanded 0.036) | Wm-1K-1 | Clip |
| Dielectric constant | 3 | | Clip |
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