Polystyrene

Moulded Polystyrene: This is the most common form. The shape is derived through vacuum forming or injection moulding. Highly rigid and durable, it finds wide applications in lab equipment, license plates, device housings, etc. Foam Polystyrene: This is a closed-cell foam which is rigid, tough and has high thermal insulation properties. When ingrained with graphite, it has even higher insulation. However, despite having closed cells, this form is not completely water-proof.