(Click to enlarge image) Linde's PLASTINUM Foam Injection Molding technology combines the benefits of simple chemical foaming with the efficiency gains of physical foaming. The plastic granulate is impregnated with the blowing agent carbon dioxide (CO2) in a pressure vessel (autoclave) upstream of the injection molding machine. The amount absorbed by the granulate depends on the plastic material, pressure, temperature, and impregnation time. The CO2 typically remains in the granulate for a period of more than two hours after it has been loaded and the pressure released. To enable a highly stable and reproducible process, the impregnated granulate is stored in a pressurized buffer tank, which minimizes the desorption of CO2 during storage.