Rotational molding or rotocasting is an economical method for producing hollow parts. When increased strength is required, the molded pieces can be backfilled with urethane foam. Thermosetting polyurethanes that are rotomolded produce rigid “shells” used for seating, fluid containers and theme park display fascia. During the molding process, the mixed polyurethane is poured into a mold and the mold is then rotated until the inside surfaces are completed coated to the desired thickness. The casting then cures and is demolded.

Polyurethane formulated for rotational molding exhibit properties including:

• Low viscosity
• Variety of gel times to accommodate complete, even coating of mold surfaces for a broad range of parts
• Short cure time that provides for fast mold turn-around