Rotomolding commonly uses a variety of commodity based thermoplastic materials. The most commonly used for the rotomolding process is Polyethylene (PE). PE is offered in a number of grades and classifications, such as Linear Low Density Polyethylene (LLDPE), Medium Density Polyethylene (MDPE), High Density Polyethylene (HDPE) and Cross Linked Polyethylene (XLPE). While other materials are offered for rotomolding, the selection is not as fast in comparison to other processes, such as injection molding or blow molding. Rotomolding requires that the materials be pulverized to a fine powder, typically around a 35 mesh. While some improvements have been discovered such as the ability to mold micropellets, a smaller version of a pelletized material, rotomolding is still limited in the arena of engineered resins. Some of the other materials available for rotational molding include Polypropylene, Nylons, PVC, Vinyls, Polycarbonate and some less other processed materials. Because of the requirements of powder or micropellets, many of these materials come at a premium due to processing requirements such as cryogenic grinding to get the materials reduced to powder form.
Raw materials for rotomolding vary tremendously across physical properties and their intended use for applications. Additives and colors can be blended into materials to achieve different colors or different characteristics and properties.
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