Rotational Molding Services Provided by Gregstrom Corporation

Rotational Molding (Roto Molding, Rotomolding) is a plastics processing technique that is ideally suited to produce relatively large, hollow, seamless parts which are partially or totally enclosed. Since 1946 Gregstrom Corporation has been providing molding and forming for the widest range of industries. In addition to world class molding and forming services, we offer complete assembly, testing, packaging, inventory management, and direct shipment both domestically and internationally.

What is Rotational Molding?

Rotational Molding is a low-pressure process where the strength required from the molds is minimal. This results in its ability to produce large, complex parts on short notice using low cost molds. The low processing pressure involved in rotational molding has the added advantage of producing parts which are virtually stress free.

Rotational Molding is a three step process. The first step is to load a pre-measured amount of liquid or powder resin into the mold. Next, the mold is moved into an oven, and rotated on two axes at low speed. As heat penetrates the mold, the resin adheres to the mold’s inner surface until it is completely fused. The last step is cooling. While still rotating, the mold is now cooled by air or water spray or a combination of both, lowering the temperature gradually. The mold is opened, the finished part is removed, and the mold is readied to repeat the cycle.

Gregstrom’s Rotational Molding services are economical for short production runs, prototypes as well as high volume production. Our design flexibility ranges form small, intricate designs to large, complex parts.

Our Rotational Molding services and other services have produced these and other fine products for our clients:

  • Rotationally Molded Ventilation Ducts
  • Rotationally Molded Chemical Feeder Assemblies
  • Rotationally Molded Shopping Cart Accessories
  • Rotationally Molded Manifolds
  • Pressure Formed Instrument Housing Assemblies
  • Rotationally Molded Chemical Feeders
  • Rotationally Molded Tanks
  • Rotationally Molded Bins & Pallets
  • Rotationally Molded Mufflers
  • Pressure Formed Instrument Housings
  • Rotationally Molded POP Assemblies
  • Vacuum Formed Medical Instrument Cases
  • Pressure Formed Medical Laser Assemblies
  • Pressure Formed Printer Assemblies
  • Twin Sheet Thermoformed Instrument Housings
  • Rotationally Molded Boats Pressure Formed Instrument Housings
  • Rotationally Molded Spine Boards
  • Rotationally Molded Coffee POP Display
  • Vacuum Formed Medical Instrument Cases & Covers
  • Vacuum Formed Taxi Tops
  • Rotationally Molded Baby Changing Stations
  • Rotationally Molded Lawn/Garden Equipment Housings
  • Rotationally Molded Shopping Cart Accessories
  • Pressure Formed Digital Taxi Media Display Assemblies
  • Rotationally Molded Powder Chemical Dispensers
  • Rotationally Molded 3-D Printer Housings

Unique Features of Gregstrom Rotational Molding Services

  • Low tooling costs
  • Short lead time
  • Virtually stress-free parts
  • Uniform wall thickness with no thinning in extremities
  • Ability to produce multi-wall parts
  • Molded-in graphics
  • Molded-in inserts & hardware
  • Ability to easily change part thickness
  • Undercuts possible
  • Wide selection of surface textures and colors
  • Quick tooling modifications

About Gregstrom Corporation

Gregstrom Corporation is a third generation, family owned company that has been forming lasting relationships for over 60 years. With an unwavering commitment to quality, customer service, and continual improvement, we strive to provide an array of customized services and value added options that are unparalleled in the industry. Over the years, Gregstrom Corporation has been honored with various awards from customers in recognition of high levels of quality and service. Gregstrom Corporation has also been the recipient of numerous industry awards from the Society of the Plastics Industry, Thermoforming Institute, Society of Plastics Engineers and Association of Rotational Molders.