Expanded Polypropylene (EPP)
Expanded Polypropylene (EPP) is a highly versatile closed-cell bead foam that provides a unique range of properties, including outstanding energy absorption, multiple impact resistance, thermal insulation, buoyancy, water and chemical resistance, exceptionally high strength to weight ratio and 100% recyclability. EPP can be made in a wide range of densities, from 15 to 200 grams per litre, which are transformed by moulding into densities ranging from 18 to 260 grams per litre. Individual beads are fused into final product form by the steamchest moulding process resulting in a strong and lightweight shape.
EPP is available in grades necessary for a wide range of applications, based on the technical requirements. High density grades are used where energy management is important, such as automotive bumpers and interior passenger safety components. Low density grades are used for packaging applications, and medium densities find applications in furniture and other consumer products.
Low Emission grades minimise outgassing of VOCs for automotive interior parts. Anti-static, dissipative and conductive grades, typically used for special packaging requirements, are available.
Unique performance characteristics
Porous EPP is comprised of cylinder-shaped polypropylene beads, which adds air space between the beads in the final moulded form, which enhances beneficial acoustical insulating effects and reduces weight.
EPP is commonly coloured black for automotive applications, though is often found in white for packaging products. EPP is available from some suppliers in vibrant colours suitable for presentation-grade textured surface.