Rotational Molding

Thin-walled, hollow parts that require tight tolerances can be manufactured using a rotational molding (rotomolding) process. We have the ability to create complex geometries in a single seamless part, using proprietary resins and affordable tooling.

We use the rotational molding process to create aerospace parts and high purity containers. We also have the capability to manufacture molded pieces in our ISO Class 7 Clean Room for high purity applications.

Advantages and Disadvantages of Rotational Molding

Advantages of Rotational MoldingDisadvantages of Rotational Molding
The ROI on parts over time can be higher than other manufacturing processesRotational molding may have a higher production cost than some alternative processes
This process supports complex geometries, which reduces part count and installation labor timeThere are temperature constraints of the part, due to the process being limited to plastics
Seamless parts reduce potential failure modesMold modifications are required if the design is changed
Materials used are dimensionally stable, have a low crack propensity, and are able to service a wide range of process temperatures
Durable parts that withstand impact during installation, operation, and maintenance
There is a potential for weight reduction of the part

Rotational Molding Process

Rotational molding applies a thin layer of thermoplastic material onto the interior surface of a mold.

Step 1

A mold is mounted to a multi-axis rotational molding machine. Thermoplastic resin is placed inside the mold, and in some circumstances, components such as mounting nuts or brackets are inserted at this time as well.

Step 2

The mold is rotated inside of an oven. As the mold rotates, the polymer becomes molten and forms an even layer across all internal surfaces.

Step 3

The mold goes through a cooling process to set the newly molded plastic part in place.

Step 4

The mold is removed from the machine and the plastic part is carefully taken out of the mold. The resulting seamless thermoplastic piece can be machined to tight tolerances, painted, or otherwise finished and assembled with other parts.

Rotational Molding Materials

We use a variety of thermoplastic polymers in our rotational molding process. Below are the materials we use.
Contact us to discuss what material is the best solution for your project.

wdt_IDMaterialApplicationMaximum Service TemperatureData Sheet
MaterialApplicationMaximum Service TemperatureData Sheet

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