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Rotational Molding


Custom cases manufactured by rotationally molding yield rugged and lightweight cases. This process is a highly versatile manufacturing option that allows for unlimited design possibilities at a relatively low production cost. The material of choice for case manufacturing is Polyethylene because of its excellent impact and chemical resistant properties. Roto-molding offers a great solution to produce a rugged shipping container. Roto-Molded Shipping and Storage Containers meet the rigorous specifications of the Airline Transportation Association and comply with the ATA 300 Category 1 specification for 100 trip applications. Roto-Molded Shipping and Storage containers can be gasketed to be airtight and watertight. These containers also conform to many Mil-Specifications and Federal Standards. Once your needs/ requirements are determined, Source can recommend if Roto Molding is the solution for you.

The roto-molding process is a simple, four stage cycle:

It begins with a good quality mold that is placed on an arm of an rotating molding machine that has a loading and unloading area, a heating oven, and cooling station. Several molds may be placed on the machine at the same time. A pre-measured amount of plastic pellet resin is loaded into each mold.

The molds move into the oven where they are slowly rotated on both the vertical and horizontal axis. As heat penetrates the mold, the resin melts and adheres to the molds’ inner surface until it is completely fused – no pressure is involved. The simultaneous heating and rotation distributes the material on the inner surface of the mold evenly maintaining a consistent wall thickness.

The mold is then cooled by air or water spray or a combination of both while still rotating. This gradually lowers the temperature. Once the parts are cooled, the finished part or case is removed and the mold is ready for the next cycle.

Secondary finishing operations of routing and riveting of hardware is then completed.

Click here to see how the roto molding process works.

Roto Molded Case Applications

  • Avionic equipment
  • Deployable weapons systems
  • Electronic testing and monitoring equipment
  • Military and law enforcement instrumentation
  • Medical testing and apparatus equipment
  • Oil field-monitoring equipment
  • Portable marine instrumentation
  • Portable communications equipment
  • Portable computer networks and systems
  • Telecommunications test equipment

Features and Benefits:

  • Economical tooling costs
  • Rugged packaging solution – one piece construction that is virtually stress free
  • Lightweight and resilient products
  • Excellent load-bearing properties
  • Uniform wall thickness
  • Variety of finishes and color – molded-in color for reduced maintenance and long lasting appearance
  • Molded in scratch-proof graphics
  • Ability to produce multi-wall moldings, which can be hollow or foam-filled
  • Thick corners and ribs for increased impact resistance
  • Recessed hardware and molded-in valance extends the useable life of container
  • Range of accessories include manual and automatic pressure relief valves, humidity indicators, lifting rings, fork-lift tunnels, removable or retractable or permanently mounted casters, label holders, document pouches, collapsible handles, drawers, brass inserts for panel mount equipment, and racks.
  • Range of interiors, removable or molded-in, capable of providing total protection
  • Dent and fracture resistant Polyethylene
  • Resins can be tailored to suit the application – e.g., to satisfy FDA requirements
  • Resistant to most chemicals and solvents
  • Resistant to Fungus