01 Expanded Polystyrene (EPS) is a hard, closed-cell, thermoplastic foam material manufactured from solid beads of polystyrene, which is polymerized from styrene monomer and comprises an expansion gas (pentane) dissolved within the polystyrene bead. Little amounts of gas are present in each solid polystyrene bead, and when heat (in the form of steam) is applied, the gas expands, creating closed EPS cells. With a second heat treatment and a mold, massive EPS blocks can be molded into exact custom shapes since the expanded cells occupy around 40 times the volume of the initial polystyrene bead.Expanded polystyrene (EPS) has a closed-cell structure that offers several advantages for insulation. The material provides various properties, such as resistance to humidity, shock absorption, resistance to compression, retention of vitamin C, hygienic properties, and chemical resistance. It has applications in the packaging, automotive, furnishing, and construction industries. The material is used for packaging in food and beverage and electronic markets.
June 2026 BASF announced the closure of its expandable polystyrene (EPS) production assets at the Ulsan Plastics site in South Korea as part of its portfolio optimization strategy, aligning production capacity with regional market demand.
May 2026 BEWI continued expanding its circular EPS business by increasing recycled general-purpose polystyrene (rGPPS) production and strengthening its collection and recycling network to support sustainable EPS manufacturing.
July 2025 BASF completed the transfer of its Styrodur® business to BACHL following regulatory approval, allowing BASF to sharpen its strategic focus on expandable polystyrene (EPS) through its Neopor® and Styropor® product portfolio while BACHL expanded its insulation business.
February 2025 BEWI signed an agreement to merge its EPS raw materials business with Unipol, creating one of Europe's leading EPS raw material producers while enabling BEWI to strengthen its downstream insulation and circular packaging businesses.