Polypropylene rotational molding supports a wide range of demanding applications because of this plastic’s superior mechanical properties, resistance to abrasion, and lower shrinkage. Polypropylene can also be used in injection molding and blow molding, but rotational molding with PP leverages the advantages of a proven manufacturing process that creates strong, hollow parts with low tooling costs and quick tooling modifications.
Rotational Molding Advantages
Rotational molding, or rotomolding, uses tooling that can range from simple two-piece sheet metal molds to multi-piece aluminum molds with articulating features. Many rotomolded shapes are impossible to produce by other methods, and rotational molding supports molded-in hardware for added strength and durability. Unlike other plastics manufacturing processes, rotational molding also supports uniform walls without thinning in the extremities.
Polypropylene (PP) is a durable, moldable plastic with a high melting point that can withstand cold-temperature applications. PP is also resistant to stress, even when flexed. Moreover, this versatile polymer won’t react with water, detergents, acids, or bases. In addition to offering good fatigue resistance and impact strength, PP is a good electrical insulator. Polypropylene is also available in pre-colored compounds, which eliminates the need for parts painting.
PP Rotational Molding Applications
Polypropylene rotational molding can be used in medical applications because this plastic supports autoclaving, a sterilization method that uses high-pressure steam. Outdoor applications for PP rotational molding include underground plastic tanks, pipes, and drainage lines. Indoors, rotomolded polypropylene can be used with food or beverage storage tanks, vessels, and containers. Rotomolded PP parts with thick walls combine strength with resistance to abrasion and elevated temperatures.
Polypropylene Rotational Molding from Gregstrom
Gregstrom Corporation of Worcester, Massachusetts (USA) is an experienced rotational molder that works with polypropylene and can help you to determine if this material is the right choice for your rotomolding application. From tooling and design assistance to plastic finishing, assembly and testing, and quality assurance, Gregstrom adds value to your plastic project. To learn more about our capabilities or to request a quote for polypropylene rotational molding, contact us.