Density from 18 to 860 kg/m³.

Polyurethane can be classified into two different categories:
– Expanded polyurethane (polyether or polyester): mainly used as an air-tight seal and as a soundproofing thanks to its open cellularization.
– Microcellular polyurethane: mainly used as an anti-vibrating and anti-sinking pad, it has a constant elastic return over time without loss of performance.