A new injection molding grade of HDPE is said to deliver a combination of outstanding ESCR and the fast cycles required by makers of beverage closures and collapsible tubes. Hostalen GX4027 from Basell Polyolefins, Elkhart, Md., is produced with the company’s Hostalen Advanced Cascade Process (ACP). “Beverage closures need to withstand extreme climate conditions, long shelf life, and high carbonation levels, while collapsible tubes must resist extreme stress in use. Converters demand faster cycle times without a loss of ESCR,” says James Stern, technical manager for caps and closures at Basell Polyolefins Europe.
Industrial trials of the new HDPE reportedly show significant savings in cycle times from reducing melt temperature by 40° C (72° F) without harmful effect on mold filling. Independent sensory tests have shown the material to exhibit good organoleptics as required in beverage applications.