About

Rotational Molding Company

Gregstrom Corporation is a Made in the USA rotational molding company that provides value-added services like assembly and testing.

Rotational Molding Company

Gregstrom is a third-generation, family-owned, rotational molding company and plastic thermoformer with a 60,000 sq. ft. facility in Woburn, Massachusetts (USA). For nearly 70 years, we’ve been an industry leader in custom rotational molding and heavy-gauge thermoforming. To see some examples of our rotational molding work, please view our featured projects. You can see examples of rototomolded products on our Portfolio page.

What is Rotational Molding?

Rotational molding creates hollow plastic parts according to your precise specifications – and with low tooling costs. With roto molding, powder or resin is loaded into a hollow mold which then rotates on two axes inside an oven until the inside of the mold is coated uniformly. After the mold is cooled, the hollow plastic part is removed.

Advantages of Rotational Molding

With its low tooling costs and quick tooling modifications, rotational molding is ideal for prototyping and for both low and higher volume production runs. Roto molding tooling ranges from simple two-piece sheet metal molds to multi-piece aluminum molds with articulating features.

Value-Added Roto Molding

As a value-added rotational molder, Gregstrom provides complete testing and assembly services. We’re also familiar with certifications and standards from regulatory agencies and industry organizations. If you need to meet requirements from the FDA, NSF, UL, and CSA, we can help. By leveraging our plastic contract manufacturing capabilities, you can control costs and achieve compliance.

Made in the USA Rotational Molding Company

For nearly 70 years, Gregstrom Corporation has been forming and molding plastics at our Made in the USA manufacturing facilities in Massachusetts. To learn how our experience and expertise as a custom rotomolder and thermoformer can support your application, contact us online or call (781) 935-6600.