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Expanded Polystyrene Foam (EPF) manufacturing
Ex LPG/ Propane can be used as a common special "blowing" agent in the production of the expanded polystyrene.
Expanded polystyrene foam (EPF) is a plastic material that has special properties due to its structure. Composed of individual cells of low density polystyrene, EPF is extraordinarily light and can support many times its own weight in water. Because its cells are not interconnected, heat cannot travel through EPF easily, so it is a great insulator. EPF is used in flotation devices, insulation, egg cartons, flats for meat and produce, sandwich and hamburger boxes, drinking cups, plates, peanut packaging, and picnic coolers
Features
EPF's main component is styrene (C 8 H 8 ). To form the low-density, loosely attached cells EPF is noted for, polystyrene is suspended in water to form droplets and then a suspension agent is added to the water to hold up the droplets, preventing them from sticking together. The beads of polystyrene produced by suspension polymerization are tiny and hard. To make them expand, a special “blowing” agent is used, and here is where LPG (amongst also other alternatives) plays this role.
