What is Rotomolding?

In the rotational molding process, a hollow mold made of either aluminum and/or stainless steel is filled with raw material, typically polyresin, and then rotated biaxially through both heating and cooling chambers. The rotation causes the material to stick evenly to the walls of the mold during the heating phase, and prevents deformities during the cooling phase.

Additionally, rotational molding yields extremely strong finished products because it does not change the molecular structure of the polyresin, unlike injection or blow molding, which both shape plastic by applying pressure, therefore weakening it.

Rotomolding can be used to manufacture complex parts that have double walls, undercuts, intricate contours and molded-in inserts.


  • The molecular structure of the polyresin remains unchanged, retaining its exceptional strength.
  • Parts otherwise assembled from multiple pieces can be molded as one part, reducing fabrication costs.
  • Stress-free corners and consistent wall thickness.


Ferry RS3000

Built in 2006, the Ferry RS3000 has a 5,000 lb. load capacity per arm, with custom modifications making each arm 10in. longer than standard.  With four independent arms and five stations, this machine allows us to customize cycles independently of one another, giving us the option to run different products at the same time.

The substantial proprietary changes we’ve made to our RS3000, specifically in regard to the distribution of heat, allow more uniform cooking and shorter run cycles.

Interested in roto-molding with us? Click here. (Link to form on contact page)