Rotational molding is a plastic molding process with lower tooling costs than injection molding. Rotomolding, as rotational molding is commonly known, also offers quick tooling modifications and a choice of plastic materials for strong, hollow parts. Gregstrom Corporation, a plastics manufacturer near Boston, Massachusetts (USA), provides the rotational molding that you need along with value-added services such as tooling, design assistance, plastic finishing, assembly and testing, and quality assurance.

Contact us to request a quote or keep reading to learn about rotomolding’s advantages.

Rotational Molds vs. Injection Molds

With rotational molding, production tooling can be made from aluminum that’s been cast or sheet metal that’s been fabricated or machined. Prototype tools are sometimes made of wood or other inexpensive materials instead. This YouTube video shows how rotational molds are used and why rotomolding is a great choice for both small, intricate components and large, complex assemblies.

Unlike rotomolding, the tooling for injection molding is usually CNC machined from blocks of stainless steel or tool steel. Both the materials and the machining process itself can be expensive, which also means that injection molding is not a good choice if design changes could require new tooling. Injection molds can also take a long time to produce and delay the start of time-sensitive projects.

Rotational Molding Materials for Strong, Hollow Parts

Rotational molding uses some of the same materials as injection molding but can produce strong, hollow parts in a single piece.

• LLDPE is used in plastic tanks, buckets, bins, toys, containers, and outdoor recreational products.
• HDPE is often used in the food processing industry and includes materials that can meet FDA and USDA requirements.
• PP has a high melting point, can withstand cold-temperature applications, and is resistant to stress even when flexed
• Static dissipative PE is often used in electrical and electronic applications because it won’t generate a potentially hazardous charge.

Injection molding can also these materials, but it can’t produce hollow objects. Plus, large injection molds can cost tens of thousands of dollars.

Get Started with Better Plastic Molding

Would you like to learn more about rotational molding and its advantages? Gregstrom Corporation of Woburn, Massachusetts (USA) has 75+ years of plastics manufacturing experience. Contact us to discuss your next plastics project.