Sulzer Chemtech and Borealis develop new extrusion process for expanded PP By Mary Page Bailey | April 7, 2021 Sulzer Chemtech Ltd. (Winterthur, Switzerland) and Borealis Group AG (Vienna, Austria) have completed the development of an innovative process for the cost-effective extrusion of expanded polypropylene (ePP) beads. Polypropylene (PP) is a highly effective material, offering advanced mechanical properties and being well suited for reusing and recycling. To support the large-scale adoption of ePP, Sulzer Chemtech is now launching a new and innovative production line. Developed together with raw material supplier Borealis, the resulting solution supports the end market efforts towards more circular solutions and is expected to cut manufacturing costs by up to 60%.