Foam is widely used as protective packaging material and has unique shock absorbing abilities. There are basically four different materials (polymers) and two main manufacturing techniques that are used to meet required specifications. Foams can be either moulded or converted. Moulding demands more complicated tooling but is often an economically preferable choice for large quantities.
The quality and capabilities of the foam raw material is not only determined by the choice of polymer but also by its density and the manufacturing technique. Choice of material, quality, manufacturing method etc. decides the durability of foam products that can be made for both expendable and returnable applications. Different additives can be incorporated into the foam during the manufacturing process to obtain ESD protection or fire resistance. Some of the most common materials are Polyethylene, Polypropylene, Polystyrene, Polyurethane.
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