Discovered in 1944, EPS is a thermoplastic material with a cellular structure. Generally white, EPS is mainly composed of air (98% at20 kg / m³). The number "6", possibly accompanied by the letters "PSE", was adopted at European level as a specific marking for polystyrene to allow easy and quick identification of the material for recycling (see Commission Decision 97/129/EC of 28/01/97).

The technical characteristics of EPS, EPP and EPE are scientifically established, and enable development of products that are economical and ecological.

These materials are attractive and effective, because they are easy to shape, and due to their mechanical and insulating properties. Their lightness, their attractive price and recycling possibilities are further advantages for users.

Technical EPS, for example, offers a wide range of possibilities, with densities up to 200 kg/m3 and the possibility of tolerances down to 100μ.