A thermoplastic polymer, polypropylene (also called polypropene) has properties between those of LDPE and HDPE and is one of the most versatile polymers available.
Chemical Composition
Also Known As
Polypropene, PP. The symbol shown was developed by the Society of the Plastics Industry so that items can be labelled for easy recycling.
Properties
Semi-rigid, translucent, good chemical resistance, tough, good fatigue resistance, integral hinge property, good heat resistance.
| Property | Value |
|---|---|
| Tensile strength | 0.95–1.30 N/mm2 |
| Notched impact strength | 3.0–30.0 kJ/m2 |
| Thermal coefficient of expansion | 100–150 × 10-6 |
| Max. continued use temperature | 80 °C (176 °F) |
| Melting point | 160 °C (320 °F) |
| Glass transition temp. (atactic) | -20 °C (-4 °F) |
| Glass transition temp. (isotactic) | 100 °C (212 °F) |
| Density | 0.905 g/cm3 |